Elastic Load Balance
Elastic Load Balance
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" in this service
All results for "
" in this service
What's New
Function Overview
Service Overview
ELB Infographics
What Is ELB?
ELB Advantages
How ELB Works
Application Scenarios
Differences Between Dedicated and Shared Load Balancers
Load Balancer Types
Feature Comparison Details
Load Balancing on a Public or Private Network
Network Traffic Paths
Specifications of Dedicated Load Balancers
Notes and Constraints
Security
Shared Responsibilities
Identity and Access Management
Auditing and Logging
Risk Control
Certificates
Permissions
Product Concepts
Basic Concepts
Region and AZ
ELB and Other Services
Billing
Billing Overview
Billing Mode
Overview
Pay-per-Use Billing
Billing Items (Dedicated Load Balancers)
Billing Items (Shared Load Balancers)
Billing Examples
Bills
Arrears
Stopping Billing
Cost Management
FAQs
When Do I Need Public Bandwidth for ELB?
Will I Be Billed for Both the Bandwidth Used by the Load Balancer and the Bandwidth Used by Backend Servers?
Do I Need to Adjust the Bandwidth of Shared Load Balancers Based on the Bandwidth Used by Backend Servers?
Can I Modify the Bandwidth of a Load Balancer?
What Functions Will Become Unavailable If a Load Balancer Is Frozen?
Getting Started
Using ELB to Distribute Traffic to a Web Application Across ECSs
Using ELB to Distribute Traffic to Multiple Web Applications Across ECSs
User Guide
User Guide for Dedicated Load Balancers
Using a Dedicated Load Balancer
Permissions Management
Creating a User and Granting Permissions
Creating a Custom Policy
Load Balancer
Dedicated Load Balancer Overview
Creating a Dedicated Load Balancer
Configuring Modification Protection or Deletion Protection for Dedicated Load Balancers
Modifying the Basic Configurations of a Dedicated Load Balancer
Modifying the Network Configurations of a Dedicated Load Balancer
Exporting Dedicated Load Balancers
Deleting or Unsubscribing from Dedicated Load Balancers
Copying a Dedicated Load Balancer
Enabling or Disabling a Load Balancer
Recycle Bin (Dedicated Load Balancer)
Associated Services
Connecting ELB to a Cloud Mode WAF Instance on the ELB Console
Listener
Listener Overview
Network Listeners
Adding a TCP Listener
Adding a UDP Listener
Adding a UDP Listener (with a QUIC Backend Server Group Associated)
Adding a TLS Listener
Application Listeners
Adding an HTTP Listener
Adding an HTTPS Listener
Adding a QUIC Listener
Forwarding Policy
Advanced Forwarding
Advanced Forwarding
Managing an Advanced Forwarding Policy
HTTP Headers
Configuring Data Compression for an HTTP or HTTPS Listener
Enabling HTTP/2 for Faster Communication
Managing a Listener
Backend Server Group
Backend Server Group Overview
Creating a Backend Server Group
Controlling Traffic Distribution
Load Balancing Algorithms
Enabling Sticky Session to Accelerate Access
Slow Start
Changing a Backend Server Group
Managing a Backend Server Group
Backend Server
Backend Server Overview
Security Group and Network ACL Rules
Adding Backend Servers in the Same VPC as a Load Balancer
Adding Backend Servers in a Different VPC from a Load Balancer
Health Check
Health Check
Configuring a Health Check
Security
Using Dedicated Load Balancers to Transfer Client IP Address
Configuring TLS Security Policies for Encrypted Communication
Using SNI Certificates for Access Through Multiple Domain Names
Certificate
Certificate Overview
Adding a Certificate
Managing Certificates
Binding or Replacing a Certificate
Replacing the Certificate Bound to Different Listeners
Access Control
What Is Access Control?
IP Address Group
Protection for Mission-Critical Operations
Enabling Access Logging for Your Load Balancer
Tags and Quotas
Tag
Quotas
Cloud Eye Monitoring
Monitoring ELB Resources
ELB Monitoring Metrics
Event Monitoring
Viewing Traffic Usage
CTS Auditing
Key Operations Recorded by CTS
Viewing Traces
User Guide for Shared Load Balancers
Permissions Management
Creating a User and Granting Permissions
Creating a Custom Policy
Load Balancer
Shared Load Balancer Overview
Creating a Shared Load Balancer
Configuring Modification Protection for Shared Load Balancers
Changing the Network Configurations of a Shared Load Balancer
Deleting a Shared Load Balancer
Enabling or Disabling a Shared Load Balancer
Enabling Guaranteed Performance for a Shared Load Balancer
Listener
Listener Overview
Adding a TCP Listener
Adding a UDP Listener
Adding an HTTP Listener
Adding an HTTPS Listener
Forwarding Policy
Enabling HTTP/2 for Faster Communication
Managing a Listener
Deleting a Listener
Backend Server Group
Backend Server Group Overview
Creating a Backend Server Group
Controlling Traffic Distribution
Load Balancing Algorithms
Enabling Sticky Session to Accelerate Access
Changing a Backend Server Group
Managing a Backend Server Group
Backend Server
Backend Server Overview
Security Group and Network ACL Rules
Cloud Servers
Health Check
Health Check
Enabling or Disabling Health Check
Security
Transfer Client IP Address
SNI Certificate
TLS Security Policy
Access Control
What Is Access Control?
IP Address Group
Certificate
Certificate Overview
Adding a Certificate
Managing Certificates
Binding or Replacing a Certificate
Replacing the Certificate Bound to Different Listeners
Protection for Mission-Critical Operations
Access Logging
Tags and Quotas
Tag
Quotas
Cloud Eye Monitoring
Monitoring ELB Resources
Monitoring Metrics
Viewing Traffic Usage
CTS Auditing
Key Operations Recorded by CTS
Self-service Troubleshooting
Overview
Troubleshooting an Unhealthy Backend Server
Other Issues
Appendix
Configuring the TOA Module
Best Practices
Load Balancer Selection and Service Planning
Planning Subnets for Dedicated Load Balancers
Adding the IP Address of an On-Premises Server as a Backend Server of a Dedicated Load Balancer
Using IP as a Backend to Route Traffic Across Backend Servers
Overview
Routing Traffic to Backend Servers in a Different VPC from the Load Balancer
Routing Traffic to Backend Servers in the Same VPC as the Load Balancer
Adding a Load Balancer to an AS Group to Automatically Add or Remove Backend Servers
Security
ELB Security Best Practices
Configuring HTTPS at the Frontend and Backend for Access Encryption
Integrating WAF with ELB to Protect Your Websites
Using ELB and CNAD Advanced to Enhance the Defense Against DDoS Attacks
Using Cloud Eye to Monitor ELB Resources
Basic Functions
Using ELB to Redirect HTTP Requests to an HTTPS Listener for Higher Service Security
Configuring One-way Authentication When Adding an HTTPS Listener
Configuring Mutual Authentication When Adding an HTTPS Listener
Using a Dedicated Load Balancer for TLS Offloading (One-Way Authentication)
Using a Dedicated Load Balancer for TLS Offloading (Mutual Authentication)
Advanced Functions
Using QUIC to Accelerate Access to an Application
Using ELB to Distribute gRPC Requests to Improve Concurrency Efficiency
Using WebSocket for Real-time Messaging
Using a Dedicated Load Balancer to Forward Traffic by Port Ranges
Enabling IPv4/IPv6 Translation to Enable IPv6 Clients to Access IPv4 Services
Using a Dedicated Load Balancer at Layer 4 to Transfer Client IP Addresses
Using a Dedicated Load Balancer at Layer 7 to Transfer Client IP Addresses
Querying Client IP Addresses in ELB Access Logs
Forwarding Policies
Using Advanced Forwarding for Application Iteration
Distributing Traffic Based on the Same Domain Name but Different Paths
API Reference
Before You Start
API Overview
Selecting an API Version
Calling APIs
Making an API Request
Authentication
Response
APIs (V3)
API Version
Querying API Versions
Quota
Querying Quotas
Querying Quota Usage
AZ
Querying AZs
Load Balancer Flavor
Querying Flavors
Viewing the Details of a Flavor
Reserved IP Address
Calculating the Number of Reserved IP Addresses
Load Balancer
Creating a Load Balancer
Batch Creating Load Balancers
Upgrading a Load Balancer
Querying Load Balancers
Copying a Load Balancer
Viewing the Details of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Deleting a Load Balancer and Its Associated Resources
Deleting a Load Balancer and Its Associated Resources (Including EIPs)
Querying the Status Tree of a Load Balancer
Deploying a Load Balancer in Other AZs
Removing a Load Balancer from AZs
Certificate
Creating a Certificate
Querying Certificates
Querying the Details of a Certificate
Updating a Certificate
Deleting a Certificate
Enabling or Disabling the Private Key Feature
Querying Whether the Private Key Feature Is Enabled
Security Policy
Creating a Custom Security Policy
Querying Custom Security Policies
Querying the Details of a Custom Security Policy
Updating a Custom Security Policy
Deleting a Custom Security Policy
Querying System Security Policies
IP Address Group
Creating an IP Address Group
Querying IP Address Groups
Querying the Details of an IP Address Group
Updating an IP Address Group
Deleting an IP Address Group
Updating IP Addresses in an IP Address Group
Deleting IP Addresses from an IP Address Group
Querying the Listeners Associated with an IP Address Group
Listener
Adding a Listener
Querying Listeners
Viewing the Details of a Listener
Updating a Listener
Deleting a Listener
Deleting a Listener and Its Associated Resources
Backend Server Group
Creating a Backend Server Group
Querying Backend Server Groups
Querying the Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Deleting a Backend Server Group and Associated Resources
Backend Server
Adding a Backend Server
Querying Backend Servers
Viewing the Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Querying Backend Servers
Batch Adding Backend Servers
Batch Deleting Backend Servers
Batch Updating Backend Servers
Health Check
Configuring a Health Check
Querying Health Checks
Viewing the Details of a Health Check
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying the Details of a Forwarding Policy
Modifying a Forwarding Policy
Deleting a Forwarding Policy
Batch Modifying Forwarding Policy Priorities
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Viewing the Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Active/Standby Backend Server Group
Creating an Active/Standby Backend Server Group
Querying Active/Standby Backend Server Groups
Viewing the Details of an Active/Standby Backend Server Group
Deleting an Active/Standby Backend Server Group
Log
Creating a Log
Querying Logs
Viewing the Details of a Log
Updating a Log
Deleting a Log
Asynchronous Task
Querying the Asynchronous Tasks
Feature Configuration
Querying the Feature Configurations of ELB
Querying the Feature Configurations of a Load Balancer
Asynchronous Tasks
Querying the Status of an Asynchronous Task
APIs (V2)
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Querying Details of a Load Balancer
Querying the Status Tree of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Listener
Adding a Listener
Querying Details of a Listener
Querying Listeners
Updating a Listener
Deleting a Listener
Backend Server Group
Adding a Backend Server Group
Querying Backend Server Groups
Querying Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Querying Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Querying Health Check Details
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Querying Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Whitelist
Adding a Whitelist
Querying Details of a Whitelist
Querying Whitelists
Updating a Whitelist
Deleting a Whitelist
Certificate
Creating a Certificate
Querying Certificates
Querying Details of a Certificate
Updating a Certificate
Deleting a Certificate
APIs (OpenStack)
Tag
Adding a Tag to a Load Balancer
Batch Adding Load Balancer Tags
Batch Deleting Load Balancer Tags
Querying All Tags of a Load Balancer
Querying the Tags of All Load Balancers
Querying Load Balancers by Tag
Deleting a Tag from a Load Balancer
Adding a Tag to a Listener
Batch Adding Tags to a Listener
Batch Deleting Tags from a Listener
Querying All Tags of a Listener
Querying the Tags of All Listeners
Querying Listeners by Tag
Deleting a Tag from a Listener
Status Codes
Examples
Creating a Dedicated Load Balancer and Binding a New EIP to It
Adding a Listener to a Dedicated Load Balancer
Deleting a Dedicated Load Balancer
Creating a Public Network (Shared) Load Balancer
Querying the ID of an ECS Used as a Backend Server
Permissions and Supported Actions
Introduction
Supported Actions (V2)
Load Balancer
Listener
Backend Server Group
Backend Server
Health Check
Forwarding Policy
Forwarding Rule
Whitelist
SSL Certificate
Quota
Tag
Precautions for API Permissions
Supported Actions (V3)
Load Balancer
Listener
Backend Server Group
Backend Server
Health Check
Forwarding Policy
Forwarding Rule
IP Address Group
Certificate
Security Policy
Quota
API Version
Availability Zone
Load Balancer Flavor
Precautions for API Permissions
Historical APIs
Shared Load Balancer APIs (OpenStack) (Discarded)
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Querying Details of a Load Balancer
Querying the Status Tree of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Listener
Adding a Listener
Querying Listeners
Querying Details of a Listener
Updating a Listener
Deleting a Listener
Backend Server Group
Adding a Backend Server Group
Querying Backend Server Groups
Querying Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Querying Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Querying Details of a Health Check
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Querying Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Whitelist
Adding a Whitelist
Querying Whitelists
Querying Details of a Whitelist
Updating a Whitelist
Deleting a Whitelist
Certificate
Creating a Certificate
Querying Certificates
Querying Details of a Certificate
Updating a Certificate
Deleting a Certificate
Asynchronous Job Query (Discarded)
Querying Versions (Discarded)
Getting Started
Creating a Load Balancer
Obtaining a Token
Creating a Load Balancer
Creating a Public Network Load Balancer
Adding a Listener
Creating a Backend Server Group
Adding Backend Servers
Configuring a Health Check
Adding a Forwarding Policy
Adding a Forwarding Rule
Adding a Whitelist
Creating an SSL Certificate
Appendix
Error Codes
Status Codes
General Information About Shared Load Balancers
Querying Data in Pages
Sequencing Query Results
Basic Workflow
Obtaining a Project ID
SDK Reference
SDK Overview
FAQs
Popular Questions
Service Abnormality
What Can I Do If There Is Packet Loss?
Why Can't I Access My Backend Servers Through a Load Balancer?
Why Does a Server Occasionally Time Out When a Client Access It Through Different Load Balancers or Different Listeners of a Load Balancer?
What Can I Do If ELB Can't Be Accessed or Traffic Routing is Interrupted?
How Can I Handle Abnormal Status Codes?
How Do I Handle Abnormal Request Headers?
How Do I Check for Traffic Inconsistencies?
Why Does ELB Fail to Distribute Traffic Evenly?
How Do I Check If There Is Excessive Access Delay?
What Do I Do If a Load Balancer Fails a Stress Test?
How Do I Check If Sticky Sessions Failed to Take Effect?
How Do I Check SSL/TLS Authentication Errors?
Health Checks
How Do I Troubleshoot an Unhealthy Backend Server of a Dedicated Load Balancer?
How Do I Troubleshoot an Unhealthy Backend Server of a Shared Load Balancer?
Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from the Configured Interval?
How Does ELB Perform UDP Health Checks? What Are the Precautions for UDP Health Checks?
Why Does ELB Frequently Send Requests to Backend Servers During Health Checks?
When Does a Health Check Start?
What Do I Do If a Lot of Access Logs Are Generated During Health Checks?
What Status Codes Will Be Returned If Backend Servers Are Identified as Healthy?
ELB Functionality
Can Load Balancers Be Used Separately?
Can ELB Block DDoS Attacks and Secure Web Code?
Can Backend Servers of a Load Balancer Run Different OSs?
Can ELB Be Used Across Accounts or VPCs?
Can a Backend Server Access Its Load Balancer?
Can Both the Listener and Backend Server Group Use HTTPS?
Does ELB Support IPv6 Networks?
How Do I Determine the Server Response Time Based on Monitoring Data and Logs?
How Can I Transfer the IP Address of a Client?
What Are the Differences Between Persistent Connections and Sticky Sessions?
How Do I Test Sticky Sessions Using Linux Curl Commands?
Load Balancers
How Does ELB Distribute Traffic?
How Can I Configure Load Balancing for Containerized Applications?
Why Multiple IP Addresses Are Required When I Create a Dedicated Load Balancer?
Can Backend Servers Access the Internet Using the EIP of the Load Balancer?
Do Shared Load Balancers Have Specifications?
What Is the Difference Between the Bandwidth Defined in Each Specification of a Dedicated Load Balancer and the Bandwidth of an EIP?
How Do I Combine ELB and WAF?
Does ELB Have a Limit on Concurrent Connections?
Listeners
What HTTP Headers Can I Configure for an HTTP and HTTP Listener?
Will ELB Stop Distributing Traffic Immediately After a Listener Is Deleted?
Does ELB Have Restrictions on the File Upload Speed and Size?
Can Multiple Load Balancers Route Requests to One Backend Server?
How Is WebSocket Used?
What Are the Three Timeouts of a Listener?
Why Can't I Select the Target Backend Server Group When Adding or Modifying a Listener?
Why Is There a Security Warning After a Certificate Is Configured for an HTTPS Listener?
Why Is a Forwarding Policy in the Faulty State?
Backend Servers
How Load Balancing Algorithms and Sticky Session Type of a Backend Server Group Are Related?
Can Backend Servers Access the Internet After They Are Associated with a Load Balancer?
Can ELB Distribute Traffic Across Servers That Are Not Provided by Huawei Cloud?
Why Are Backend Servers Frequently Accessed by IP Addresses in 100.125.0.0/16 or 214.0.0.0/8?
Can ELB Route Traffic Across Regions?
Does Each Backend Server Need an EIP to Receive Requests from a Public Network Load Balancer?
How Do I Check the Network Conditions of a Backend Server?
How Can I Check the Network Configuration of a Backend Server?
How Do I Check the Status of a Backend Server?
How Do I Check Whether a Backend Server Can Be Accessed Through an EIP?
Why Is the Number of Active Connections Monitored by Cloud Eye Different from the Number of Connections Established with the Backend Servers?
Why Can I Access Backend Servers After a Whitelist Is Configured?
When Will the Changes to Server Weights Be Applied?
Certificates
Does ELB Support Wildcard Certificates?
Why Is Access to Backend Servers Still Abnormal Even If I Have Created a Certificate?
Will the Network or Load Balancing Be Interrupted When a Certificate Is Being Replaced?
Access Logging
Why Are Access Logs Not Displayed for My Load Balancer?
What Information Can I Provide to Assist O&M Personnel?
Monitoring
Why Is the Outgoing Rate on the ELB Console Inconsistent with the Bandwidth Usage Statistics on the Cloud Eye Console?
What Are the Differences Between Layer-7 Status Codes and Backend Status Codes in ELB Metrics?
Why Is There a Large Number of HTTP 499 Errors?
Billing
When Do I Need Public Bandwidth for ELB?
Will I Be Billed for Both the Bandwidth Used by the Load Balancer and the Bandwidth Used by Backend Servers?
Do I Need to Adjust the Bandwidth of Shared Load Balancers Based on the Bandwidth Used by Backend Servers?
Can I Modify the Bandwidth of a Load Balancer?
What Functions Will Become Unavailable If a Load Balancer Is Frozen?
Videos
Glossary
More Documents
User Guide (ME-Abu Dhabi Region)
Service Overview
What Is Elastic Load Balance?
Product Advantages
Application Scenarios
How ELB Works
Network Type
ELB and Other Services
Product Concepts
Basic Concepts
Region and AZ
Load Balancer
Network Type
Preparing for Creation
Creating a Load Balancer
Changing Load Balancer Settings
Binding or Unbinding an EIP
Deleting a Load Balancer
Listener
Overview
Protocols and Ports
Adding a Listener
Load Balancing Algorithms
Sticky Session
Access Control
Modifying or Deleting a Listener
Advanced Settings for HTTP or HTTPS Listeners
Forwarding Policy
Mutual Authentication
HTTP/2
HTTP Redirection to HTTPS
SNI
Backend Server
Overview
Configuring Security Group Rules
Adding Backend Servers to or Removing Backend Servers
Health Check
Configuring a Health Check
Disabling the Health Check Function
Certificate
Certificate and Private Key Format
Converting Certificate Formats
Creating a Certificate
Access Logging
Monitoring
Monitoring Metrics
Setting an Alarm Rule
Adding an Alarm Rule
Modifying an Alarm Rule
Viewing Metrics
Auditing
Key Operations Recorded by CTS
Viewing Traces
FAQs
Questions Summary
ELB Usage
Service Abnormality
How Can I Check ELB Unavailability or Routing Interruption?
ELB Functionality
Can ELB Be Used Separately?
Is the EIP Assigned to a Load Balancer Exclusive?
How Many Load Balancers and Listeners Can I Have?
Can I Adjust the Number of Backend Servers When a Load Balancer is Running?
Can Backend Servers Run Different OSs?
Performance and Workloads
How Can I Check Traffic Inconsistency?
How Can I Check that Traffic Is Unbalanced?
How Can I Check High Access Delay of a Load Balancer?
What Should I Do If a Load Balancer's Performance Fails the Stress Test?
Load Balancer
How Does ELB Distribute Traffic?
How Can I Configure a Public or Private Network Load Balancer?
Listener
What Are the Relationships Between Load Balancing Algorithms and Sticky Session Types?
How Can ELB Support Multiple Certificates?
How Can I Use WebSocket?
Backend Server
Why Is the Interval at Which Backend Servers Receive Health Check Packets Is Different from the Configured Health Check Interval?
Can Backend Servers Access the Public Network After They Are Associated with a Load Balancer?
How Can I Check the Network Conditions of a Backend Server?
How Can I Check the Network Configuration of a Backend Server?
How Can I Check the Status of a Backend Server?
When Is a Backend Server Considered Healthy?
Health Check
What Should I Do If a Backend Server Is Unhealthy?
What Are the Precautions of Using UDP for Health Checks?
Why Does ELB Frequently Send Requests to Backend Servers During Health Checks?
Obtaining Source IP Addresses
How Can I Obtain the IP Address of a Client?
HTTP/HTTPS Listeners
Why Is the Security Warning Still Displayed After a Certificate Is Configured?
Sticky Session
What Should I Do If Sticky Sessions Fail to Take Effect?
What Types of Sticky Sessions Does ELB Support?
Appendix
Configuring the TOA Plug-in
Change History
API Reference (ME-Abu Dhabi Region)
Before You Start
Notes and Constraints
Concepts
API Overview
Calling APIs
Making an API Request
Authentication
Response
Getting Started
Creating a Load Balancer
Load Balancer APIs
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Querying Details of a Load Balancer
Querying the Status Tree of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Listener
Adding a Listener
Querying Listeners
Querying Details of a Listener
Updating a Listener
Deleting a Listener
Backend Server Group
Adding a Backend Server Group
Querying Backend Server Groups
Querying Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Querying Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Querying Details of a Health Check
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Querying Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Whitelist
Adding a Whitelist
Querying Whitelists
Querying Details of a Whitelist
Updating a Whitelist
Deleting a Whitelist
Certificate
Creating a Certificate
Querying Certificates
Querying Details of a Certificate
Updating a Certificate
Deleting a Certificate
Load Balancer (Enterprise Project) APIs
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Querying Details of a Load Balancer
Querying the Status Tree of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Listener
Adding a Listener
Querying Details of a Listener
Querying Listeners
Updating a Listener
Deleting a Listener
Backend Server Group
Adding a Backend Server Group
Querying Backend Server Groups
Querying Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Querying Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Querying Health Check Details
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Querying Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Whitelist
Adding a Whitelist
Querying Details of a Whitelist
Querying a Whitelist
Updating a Whitelist
Deleting a Whitelist
Certificate
Creating a Certificate
Querying Certificates
Querying Details of a Certificate
Updating a Certificate
Deleting a Certificate
Common Parameters
HTTP Status Codes of Load Balancers
Appendix
Monitoring Metrics
General Information About Load Balancers
Querying Data in Pages
Sequencing Query Results
Querying Versions
Basic Workflow
Obtaining a Project ID
Change History
User Guide (Paris Region)
Service Overview
What Is ELB?
Product Advantages
How ELB Works
Application Scenarios
Differences Between Dedicated and Shared Load Balancers
Load Balancing on a Public or Private Network
Network Traffic Paths
Specifications of Dedicated Load Balancers
Quotas and Constraints
Billing (Shared Load Balancers)
Billing (Dedicated Load Balancers)
Permissions
Product Concepts
Basic Concepts
Region and AZ
How ELB Works with Other Services
Getting Started
Overview
Process Flowchart
Using Shared Load Balancers (Entry Level)
Using Shared Load Balancers (Advanced Level)
Load Balancer
Overview
Preparations for Creating a Load Balancer
Creating a Dedicated Load Balancer
Creating a Shared Load Balancer
Configuring Deletion Protection for Load Balancers
Modifying the Bandwidth
Changing the Specifications of a Dedicated Load Balancer
Changing an IP Address
Binding an IP Address to or Unbinding an IP Address from a Load Balancer
Adding to or Removing from an IPv6 Shared Bandwidth
Exporting the Load Balancer List
Deleting a Load Balancer
Listener
Overview
Protocols and Ports
Adding a TCP Listener
Adding a UDP Listener
Adding an HTTP Listener
Adding an HTTPS Listener
Adding a UDP Listener (with a QUIC Backend Server Group Associated)
Configuring Timeout Durations
Modifying or Deleting a Listener
Transfer Client IP Address
Advanced Features of HTTP/HTTPS Listeners
Forwarding Policy (Shared Load Balancers)
Forwarding Policy (Dedicated Load Balancers)
Advanced Forwarding (Dedicated Load Balancers)
Advanced Forwarding
Managing an Advanced Forwarding Policy
Mutual Authentication
HTTP/2
HTTP Redirection to HTTPS
Rewriting the X-Forwarded-Host Field
SNI Certificate
Backend Server Group
Overview
Key Features
Health Check
Load Balancing Algorithms
Sticky Session
Slow Start (Dedicated Load Balancers)
Creating a Backend Server Group (Dedicated Load Balancers)
Creating a Backend Server Group (Shared Load Balancers)
Modifying a Backend Server Group
Overview
Modifying Health Check Settings
Changing the Load Balancing Algorithm
Modifying Sticky Session Settings
Modifying Slow Start Settings (Dedicated Load Balancers)
Changing a Backend Server Group
Viewing a Backend Server Group
Deleting a Backend Server Group
Backend Server (Dedicated Load Balancers)
Overview
Security Group Rules
Managing Backend Servers
Adding Backend Servers
Viewing Backend Servers
Removing Backend Servers
Changing Backend Server Weights
IP Addresses as Backend Servers
Overview
Enabling IP as a Backend
Adding IP Addresses as Backend Servers
Viewing Backend Servers
Removing Backend Servers
Changing Backend Server Weights
Backend Server (Shared Load Balancers)
Overview
Security Group Rules
Managing Backend Servers
Adding Backend Servers
Viewing Backend Servers
Removing Backend Servers
Changing Backend Server Weights
Certificate
Introduction to Certificates
Certificate and Private Key Format
Converting Certificate Formats
Adding, Modifying, or Deleting a Certificate
Replacing the Certificate Bound to a Listener
Replacing the Certificate Bound to Different Listeners
Querying Listeners by Certificate
Access Control
Access Control
Managing IP Address Groups
Creating an IP Address Group
Viewing the Details of an IP Address Group
Managing IP Addresses in an IP Address Group
Deleting an IP Address Group
TLS Security Policy
Tag
Access Logging
Monitoring
Monitoring Metrics
Setting an Alarm Rule
Creating an Alarm Rule
Modifying an Alarm Rule
Viewing Metrics
Auditing
Key Operations Recorded by CTS
Viewing Traces
Load Balancer Migration
Migrating from Classic Load Balancers to Shared Load Balancers
Permissions Management
Creating a User and Granting Permissions
Creating a Custom Policy
Quotas
FAQ
Popular Questions
Why Can't I Access My Backend Servers Through a Load Balancer?
What Can I Do If ELB Can't Be Accessed or Traffic Routing is Interrupted?
How Can I Handle Error Codes?
Can ELB Be Used Separately?
Does ELB Support Persistent Connections?
Does ELB Support FTP on Backend Servers?
Is an EIP Assigned Exclusively to a Load Balancer?
How Many Load Balancers and Listeners Can I Have?
What Types of APIs Does ELB Provide? What Are Permissions of ELB?
Can I Adjust the Number of Backend Servers When a Load Balancer is Running?
Can Backend Servers Run Different OSs?
Can I Configure Different Backend Ports for a Load Balancer?
Can ELB Be Used Across Accounts or VPCs?
Can Backend Servers Access the Ports of a Load Balancer?
Can Both the Listener and Backend Server Group Use HTTPS?
Can I Change the VPC and Subnet for My Load Balancer?
Can I Upgrade a Shared Load Balancer to a Dedicated Load Balancer Without Interrupting Traffic Routing?
Does ELB Support IPv6 Networks?
How Do I Check for Traffic Inconsistencies?
How Do I Check If Traffic Is Being Evenly Distributed?
How Do I Check If There Is Excessive Access Delay?
What Do I Do If a Load Balancer Fails a Stress Test?
Load Balancers
How Does ELB Distribute Traffic?
How Can I Access a Load Balancer Across VPCs?
How Can I Configure Load Balancing for Containerized Applications?
Why Can't I Delete My Load Balancer?
Do I Need to Configure EIP Bandwidth for My Load Balancers?
Can I Bind Multiple EIPs to a Load Balancer?
Why Multiple IP Addresses Are Required When I Create or Enable a Dedicated Load Balancer?
Why Are Requests from the Same IP Address Routed to Different Backend Servers When the Load Balancing Algorithm Is Source IP Hash?
Can Backend Servers Access the Internet Using the EIP of the Load Balancer?
Do Shared Load Balancers Have Specifications?
Will Traffic Routing Be Interrupted If the Load Balancing Algorithm Is Changed?
What Is the Difference Between the Bandwidth Included in Each Specification of a Dedicated Load Balancer and the Bandwidth of an EIP?
How Do I Combine ELB and WAF?
Listeners
What Are the Relationships Between Load Balancing Algorithms and Sticky Session Types?
Can I Bind Multiple Certificates to a Listener?
What HTTP Headers Can I Configure for an HTTP and HTTP Listener?
Will ELB Stop Distributing Traffic Immediately After a Listener Is Deleted?
Does ELB Have Restrictions on the File Upload Speed and Size?
Can Multiple Load Balancers Route Requests to One Backend Server?
How Is WebSocket Used?
Why Can't I Select the Target Backend Server Group When Adding or Modifying a Listener?
Why Cannot I Add a Listener to a Dedicated Load Balancer?
Backend Servers
Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from What I Have Configured?
Can Backend Servers Access the Internet After They Are Associated with a Load Balancer?
Why Are Backend Servers Frequently Accessed by IP Addresses in 100.125.0.0/16?
Can ELB Route Traffic Across Regions?
Does Each Backend Server Need an EIP to Receive Requests from a Public Network Load Balancer?
How Do I Check the Network Conditions of a Backend Server?
How Can I Check the Network Configuration of a Backend Server?
How Do I Check the Status of a Backend Server?
When Is a Backend Server Considered Healthy?
How Do I Check Whether a Backend Server Can Be Accessed Through an EIP?
Why Is the Number of Active Connections Monitored by Cloud Eye Different from the Number of Connections Established with the Backend Servers?
Why Can I Access Backend Servers After a Whitelist Is Configured?
When Will Modified Weights Take Effect?
Why Must the Subnet Where the Load Balancer Resides Have at Least 16 Available IP Addresses for Enabling IP as a Backend?
Health Checks
How Do I Troubleshoot an Unhealthy Backend Server?
Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from the Configured Interval?
How Does ELB Perform UDP Health Checks? What Are the Precautions for UDP Health Checks?
Why Does ELB Frequently Send Requests to Backend Servers During Health Checks?
When Does a Health Check Start?
Do Maximum Retries Include Health Checks That Consider Backend Servers Unhealthy?
What Do I Do If a Lot of Access Logs Are Generated During Health Checks?
What Status Codes Will Be Returned If Backend Servers Are Identified as Healthy?
Obtaining Source IP Addresses
How Can I Transfer the IP Address of a Client?
HTTP/HTTPS Listeners
Which Protocol Should I Select for the Backend Server Group When Adding an HTTPS Listener?
Why Is There a Security Warning After a Certificate Is Configured?
Why Is a Forwarding Policy in the Faulty State?
Why Can't I Add a Forwarding Policy to a Listener?
Why Cannot I Select an Existing Backend Server Group When Adding a Forwarding Policy?
Sticky Sessions
What Are the Differences Between Persistent Connections and Sticky Sessions?
How Do I Check If Sticky Sessions Failed to Take Effect?
How Do I Test Sticky Sessions Using Linux Curl Commands?
What Types of Sticky Sessions Does ELB Support?
Certificates
How Can I Create Server Certificates and CA Certificates?
Does ELB Support Wildcard Certificates?
Why Is Access to Backend Servers Still Abnormal Even If I Have Created a Certificate?
Will the Network or Load Balancing Be Interrupted When a Certificate Is Being Replaced?
Monitoring
Why Is the Outgoing Rate on the ELB Console Inconsistent with the Bandwidth Usage Statistics on the Cloud Eye Console?
What Are the Differences Between Layer-7 Status Codes and Backend Status Codes in ELB Metrics?
Change History
API Reference (Paris Region)
Before You Start
Overview
API Calling
Endpoints
Notes and Constraints
Concepts
API Overview
Calling APIs
Making an API Request
Authentication
Response
Getting Started
Creating a Load Balancer
Obtaining a Token
Dedicated Load Balancer APIs
API Version
Querying API Versions
Quota
Querying Quotas
Querying Quota Usage
AZ
Querying AZs
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Viewing Details of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Querying the Status Tree of a Load Balancer
Certificate
Creating a Certificate
Querying Certificates
Viewing Details of a Certificate
Updating a Certificate
Deleting a Certificate
Security Policy
Creating a Custom Security Policy
Querying Custom Security Policies
Querying Details of a Custom Security Policy
Updating a Custom Security Policy
Deleting a Custom Security Policy
Querying System Security Policies
IP Address Group
Creating an IP Address Group
Querying IP Address Groups
Viewing Details of an IP Address Group
Updating an IP Address Group
Deleting an IP Address Group
Updating IP Addresses in an IP Address Group
Deleting IP Addresses from an IP Address Group
Listener
Adding a Listener
Querying Listeners
Viewing Details of a Listener
Updating a Listener
Deleting a Listener
Backend Server Group
Creating a Backend Server Group
Querying Backend Server Groups
Viewing Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Viewing Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Viewing Details of a Health Check
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Viewing Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Batch Updating Forwarding Policy Priorities
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Viewing Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Classic Load Balancer APIs
Load Balancer
Creating a Load Balancer (Discarded)
Deleting a Load Balancer
Deleting a Public Network Load Balancer
Modifying a Load Balancer
Querying Details of a Load Balancer
Querying Load Balancers
Listener
Adding a Listener
Deleting a Listener
Modifying a Listener
Querying Details of a Listener
Querying Listeners
Health Check
Configuring a Health Check
Deleting a Health Check
Modifying a Health Check
Querying Details of a Health Check
Backend ECS
Adding Backend ECSs
Removing Backend ECSs
Querying Backend ECSs
Quota
Querying Load Balancer or Listener Quotas
Certificate
Creating a Certificate
Deleting a Certificate
Modifying a Certificate
Querying Certificates
Querying the Job Status
Querying Monitoring Metrics
API Version
Querying All API Versions
Querying a Specific API Version
Enhanced Load Balancer APIs
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Querying Details of a Load Balancer
Querying the Status Tree of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Listener
Adding a Listener
Querying Listeners
Querying Details of a Listener
Updating a Listener
Deleting a Listener
Backend Server Group
Adding a Backend Server Group
Querying Backend Server Groups
Querying Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Querying Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Querying Details of a Health Check
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Querying Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Whitelist
Adding a Whitelist
Querying Whitelists
Querying Details of a Whitelist
Updating a Whitelist
Deleting a Whitelist
Certificate
Creating a Certificate
Querying Certificates
Querying Details of a Certificate
Updating a Certificate
Deleting a Certificate
Appendix
Error Codes
Status Codes
Monitoring Metrics
General Information About SharedLoad Balancers
Querying Data in Pages
Sequencing Query Results
Basic Workflow
Obtaining a Project ID
Change History
User Guide (Kuala Lumpur Region)
Service Overview
What Is ELB?
Product Advantages
How ELB Works
Application Scenarios
Load Balancing on a Public or Private Network
Network Traffic Paths
Specifications of Dedicated Load Balancers
Quotas and Constraints
Permissions
Product Concepts
Basic Concepts
Region and AZ
How ELB Works with Other Services
Getting Started
Overview
Process Flowchart
Using Load Balancers (Entry Level)
Using Load Balancers (Advanced Level)
Load Balancer
Overview
Preparations for Creating a Load Balancer
Creating a Dedicated Load Balancer
Modifying the Bandwidth
Changing the Specifications of a Dedicated Load Balancer
Changing an IP Address
Binding an IP Address to or Unbinding an IP Address from a Load Balancer
Adding to or Removing from an IPv6 Shared Bandwidth
Exporting the Load Balancer List
Deleting a Load Balancer
Listener
Overview
Protocols and Ports
Adding a TCP Listener
Adding a UDP Listener
Adding an HTTP Listener
Adding an HTTPS Listener
Configuring Timeout Durations
Modifying or Deleting a Listener
Transfer Client IP Address
Advanced Features of HTTP/HTTPS Listeners
Forwarding Policy (Dedicated Load Balancers)
Mutual Authentication
HTTP/2
HTTP Redirection to HTTPS
Transferring the Load Balancer EIP to Backend Servers
SNI Certificate
Backend Server Group
Overview
Key Features
Health Check
Load Balancing Algorithms
Sticky Session
Slow Start (Dedicated Load Balancers)
Creating a Backend Server Group
Modifying a Backend Server Group
Overview
Modifying Health Check Settings
Changing the Load Balancing Algorithm
Modifying Sticky Session Settings
Modifying Slow Start Settings (Dedicated Load Balancers)
Changing a Backend Server Group
Viewing a Backend Server Group
Deleting a Backend Server Group
Backend Server
Overview
Security Group Rules
Managing Backend Servers
Adding Backend Servers
Viewing Backend Servers
Removing Backend Servers
Changing Backend Server Weights
IP Addresses as Backend Servers
Overview
Enabling IP as a Backend
Adding IP Addresses as Backend Servers
Viewing Backend Servers
Removing Backend Servers
Changing Backend Server Weights
Certificate
Introduction to Certificates
Certificate and Private Key Format
Converting Certificate Formats
Adding, Modifying, or Deleting a Certificate
Replacing the Certificate Bound to a Listener
Replacing the Certificate Bound to Different Listeners
Querying Listeners by Certificate
Access Control
Access Control
Managing IP Address Groups
Creating an IP Address Group
Viewing the Details of an IP Address Group
Managing IP Addresses in an IP Address Group
Deleting an IP Address Group
Access Logging
Monitoring
Monitoring Metrics
Setting an Alarm Rule
Creating an Alarm Rule
Modifying an Alarm Rule
Viewing Metrics
Auditing
Key Operations Recorded by CTS
Viewing Traces
Quotas
FAQ
Popular Questions
Service Abnormality
Why Can't I Access My Backend Servers Through a Load Balancer?
What Can I Do If ELB Can't Be Accessed or Traffic Routing is Interrupted?
How Can I Handle Error Codes?
ELB Functionality
Can ELB Be Used Separately?
Does ELB Support Persistent Connections?
Does ELB Support FTP on Backend Servers?
Is an EIP Assigned Exclusively to a Load Balancer?
How Many Load Balancers and Listeners Can I Have?
What Types of APIs Does ELB Provide? What Are Permissions of ELB?
Can I Adjust the Number of Backend Servers When a Load Balancer is Running?
Can Backend Servers Run Different OSs?
Can I Configure Different Backend Ports for a Load Balancer?
Can ELB Be Used Across Accounts or VPCs?
Can Backend Servers Access the Ports of a Load Balancer?
Can Both the Listener and Backend Server Group Use HTTPS?
Can I Change the VPC and Subnet for My Load Balancer?
Load Balancing Performance
How Do I Check for Traffic Inconsistencies?
How Do I Check If Traffic Is Being Evenly Distributed?
How Do I Check If There Is Excessive Access Delay?
What Do I Do If a Load Balancer Fails a Stress Test?
Load Balancers
How Does ELB Distribute Traffic?
How Can I Access a Load Balancer Across VPCs?
Do I Need to Configure EIP Bandwidth for My Load Balancers?
Can I Bind Multiple EIPs to a Load Balancer?
Why Multiple IP Addresses Are Required When I Create or Enable a Dedicated Load Balancer?
Why Are Requests from the Same IP Address Routed to Different Backend Servers When the Load Balancing Algorithm Is Source IP Hash?
Can Backend Servers Access the Internet Using the EIP of the Load Balancer?
Will Traffic Routing Be Interrupted If the Load Balancing Algorithm Is Changed?
What Is the Difference Between the Bandwidth Included in Each Specification of a Dedicated Load Balancer and the Bandwidth of an EIP?
Listeners
What Are the Relationships Between Load Balancing Algorithms and Sticky Session Types?
Can I Bind Multiple Certificates to a Listener?
Will ELB Stop Distributing Traffic Immediately After a Listener Is Deleted?
Does ELB Have Restrictions on the File Upload Speed and Size?
Can Multiple Load Balancers Route Requests to One Backend Server?
How Is WebSocket Used?
Why Can't I Select the Target Backend Server Group When Adding or Modifying a Listener?
Why Cannot I Add a Listener to a Dedicated Load Balancer?
Backend Servers
Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from What I Have Configured?
Can Backend Servers Access the Internet After They Are Associated with a Load Balancer?
Can ELB Route Traffic Across Regions?
Does Each Backend Server Need an EIP to Receive Requests from a Public Network Load Balancer?
How Do I Check the Network Conditions of a Backend Server?
How Can I Check the Network Configuration of a Backend Server?
How Do I Check the Status of a Backend Server?
When Is a Backend Server Considered Healthy?
Why Can I Access Backend Servers After a Whitelist Is Configured?
When Will Modified Weights Take Effect?
Why Must the Subnet Where the Load Balancer Resides Have at Least 16 Available IP Addresses for Enabling IP as a Backend?
Health Checks
How Do I Troubleshoot an Unhealthy Backend Server?
Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from the Configured Interval?
How Does ELB Perform UDP Health Checks? What Are the Precautions for UDP Health Checks?
Why Does ELB Frequently Send Requests to Backend Servers During Health Checks?
When Does a Health Check Start?
Do Maximum Retries Include Health Checks That Consider Backend Servers Unhealthy?
What Do I Do If a Lot of Access Logs Are Generated During Health Checks?
What Status Codes Will Be Returned If Backend Servers Are Identified as Healthy?
Obtaining Source IP Addresses
How Can I Transfer the IP Address of a Client?
HTTP/HTTPS Listeners
Which Protocol Should I Select for the Backend Server Group When Adding an HTTPS Listener?
Why Is There a Security Warning After a Certificate Is Configured?
Why Is a Forwarding Policy in the Faulty State?
Why Can't I Add a Forwarding Policy to a Listener?
Why Cannot I Select an Existing Backend Server Group When Adding a Forwarding Policy?
Sticky Sessions
What Are the Differences Between Persistent Connections and Sticky Sessions?
How Do I Check If Sticky Sessions Failed to Take Effect?
How Do I Test Sticky Sessions Using Linux Curl Commands?
What Types of Sticky Sessions Does ELB Support?
Certificates
How Can I Create Server Certificates and CA Certificates?
Does ELB Support Wildcard Certificates?
Why Is Access to Backend Servers Still Abnormal Even If I Have Created a Certificate?
Will the Network or Load Balancing Be Interrupted When a Certificate Is Being Replaced?
Monitoring
Why Is the Outgoing Rate on the ELB Console Inconsistent with the Bandwidth Usage Statistics on the Cloud Eye Console?
What Are the Differences Between Layer-7 Status Codes and Backend Status Codes in ELB Metrics?
Why Is There a Large Number of HTTP 499 Errors?
Change History
API Reference (Kuala Lumpur Region)
Before You Start
Endpoints
Notes and Constraints
Concepts
API Overview
Calling APIs
Making an API Request
Authentication
Response
APIs
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Querying Details of a Load Balancer
Querying the Status Tree of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Listener
Adding a Listener
Querying Details of a Listener
Querying Listeners
Updating a Listener
Deleting a Listener
Backend Server Group
Adding a Backend Server Group
Querying Backend Server Groups
Querying Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Querying Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Querying Health Check Details
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Querying Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Whitelist
Adding a Whitelist
Querying Details of a Whitelist
Querying Whitelists
Updating a Whitelist
Deleting a Whitelist
Certificate
Creating a Certificate
Querying Certificates
Querying Details of a Certificate
Updating a Certificate
Deleting a Certificate
Permissions Policies and Supported Actions
Introduction
Supported Actions
Load Balancer
Listener
Backend Server Group
Backend Server
Health Check
Forwarding Policy
Forwarding Rule
Whitelist
SSL Certificate
Quota
Tag
Precautions for API Permissions
Appendix
Status Codes
Monitoring Metrics
General Information About Load Balancers
Querying Data in Pages
Sequencing Query Results
Basic Workflow
Obtaining a Project ID
Historical APIs
Load Balancer APIs (OpenStack)
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Querying Details of a Load Balancer
Querying the Status Tree of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Listener
Adding a Listener
Querying Listeners
Querying Details of a Listener
Updating a Listener
Deleting a Listener
Backend Server Group
Adding a Backend Server Group
Querying Backend Server Groups
Querying Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Querying Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Querying Details of a Health Check
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Querying Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Whitelist
Adding a Whitelist
Querying Whitelists
Querying Details of a Whitelist
Updating a Whitelist
Deleting a Whitelist
Certificate
Creating a Certificate
Querying Certificates
Querying Details of a Certificate
Updating a Certificate
Deleting a Certificate
Querying Versions
Getting Started
Creating a Load Balancer
Change History
User Guide (Ankara Region)
Service Overview
What Is ELB?
Product Advantages
How ELB Works
Application Scenarios
Load Balancing on a Public or Private Network
Network Traffic Paths
Quotas and Constraints
Permissions
Product Concepts
Basic Concepts
Region and AZ
How ELB Works with Other Services
Load Balancer
Overview
Preparations for Creating a Load Balancer
Creating a Dedicated Load Balancer
Modifying the Bandwidth
Changing an IP Address
Binding an IP Address to or Unbinding an IP Address from a Load Balancer
Exporting the Load Balancer List
Deleting a Load Balancer
Listener
Overview
Adding a TCP Listener
Adding a UDP Listener
Adding an HTTP Listener
Adding an HTTPS Listener
Configuring Timeout Durations
Modifying or Deleting a Listener
Transfer Client IP Address
Advanced Features of HTTP/HTTPS Listeners
Forwarding Policy (Dedicated Load Balancers)
Mutual Authentication
HTTP/2
HTTP Redirection to HTTPS
Transferring the Load Balancer EIP to Backend Servers
SNI Certificate
Backend Server Group
Overview
Key Features
Health Check
Load Balancing Algorithms
Sticky Session
Slow Start (Dedicated Load Balancers)
Creating a Backend Server Group
Modifying a Backend Server Group
Overview
Modifying Health Check Settings
Changing the Load Balancing Algorithm
Modifying Sticky Session Settings
Modifying Slow Start Settings (Dedicated Load Balancers)
Changing a Backend Server Group
Viewing a Backend Server Group
Deleting a Backend Server Group
Backend Server
Overview
Security Group Rules
Managing Backend Servers
Adding Backend Servers
Viewing Backend Servers
Removing Backend Servers
Changing Backend Server Weights
IP Addresses as Backend Servers
Overview
Enabling IP as a Backend
Adding IP Addresses as Backend Servers
Viewing Backend Servers
Removing Backend Servers
Changing Backend Server Weights
Certificate
Introduction to Certificates
Certificate and Private Key Format
Converting Certificate Formats
Adding, Modifying, or Deleting a Certificate
Replacing the Certificate Bound to a Listener
Replacing the Certificate Bound to Different Listeners
Querying Listeners by Certificate
Access Control
Access Control
Managing IP Address Groups
Creating an IP Address Group
Viewing the Details of an IP Address Group
Managing IP Addresses in an IP Address Group
Deleting an IP Address Group
TLS Security Policy
Access Logging
Monitoring
Monitoring Metrics
Setting an Alarm Rule
Creating an Alarm Rule
Modifying an Alarm Rule
Viewing Metrics
Quotas
FAQ
Popular Questions
ELB Functionality
Can ELB Be Used Separately?
Does ELB Support Persistent Connections?
Does ELB Support FTP on Backend Servers?
Is an EIP Assigned Exclusively to a Load Balancer?
How Many Load Balancers and Listeners Can I Have?
What Types of APIs Does ELB Provide? What Are Permissions of ELB?
Can I Adjust the Number of Backend Servers When a Load Balancer is Running?
Can Backend Servers Run Different OSs?
Can I Configure Different Backend Ports for a Load Balancer?
Can ELB Be Used Across Accounts or VPCs?
Can Backend Servers Access the Ports of a Load Balancer?
Can Both the Listener and Backend Server Group Use HTTPS?
Can I Change the VPC and Subnet for My Load Balancer?
Load Balancers
How Does ELB Distribute Traffic?
How Can I Access a Load Balancer Across VPCs?
Do I Need to Configure EIP Bandwidth for My Load Balancers?
Can I Bind Multiple EIPs to a Load Balancer?
Why Multiple IP Addresses Are Required When I Create or Enable a Dedicated Load Balancer?
Why Are Requests from the Same IP Address Routed to Different Backend Servers When the Load Balancing Algorithm Is Source IP Hash?
Can Backend Servers Access the Internet Using the EIP of the Load Balancer?
Will Traffic Routing Be Interrupted If the Load Balancing Algorithm Is Changed?
What Is the Difference Between the Bandwidth Included in Each Specification of a Dedicated Load Balancer and the Bandwidth of an EIP?
Listeners
What Are the Relationships Between Load Balancing Algorithms and Sticky Session Types?
Can I Bind Multiple Certificates to a Listener?
Will ELB Stop Distributing Traffic Immediately After a Listener Is Deleted?
Does ELB Have Restrictions on the File Upload Speed and Size?
Can Multiple Load Balancers Route Requests to One Backend Server?
How Is WebSocket Used?
Why Can't I Select the Target Backend Server Group When Adding or Modifying a Listener?
Why Cannot I Add a Listener to a Dedicated Load Balancer?
Backend Servers
Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from What I Have Configured?
Can Backend Servers Access the Internet After They Are Associated with a Load Balancer?
Can ELB Route Traffic Across Regions?
Does Each Backend Server Need an EIP to Receive Requests from a Public Network Load Balancer?
How Do I Check the Network Conditions of a Backend Server?
How Can I Check the Network Configuration of a Backend Server?
How Do I Check the Status of a Backend Server?
When Is a Backend Server Considered Healthy?
Why Can I Access Backend Servers After a Whitelist Is Configured?
When Will Modified Weights Take Effect?
Why Must the Subnet Where the Load Balancer Resides Have at Least 16 Available IP Addresses for Enabling IP as a Backend?
Health Checks
How Do I Troubleshoot an Unhealthy Backend Server?
Why Is the Interval at Which Backend Servers Receive Health Check Packets Different from the Configured Interval?
How Does ELB Perform UDP Health Checks? What Are the Precautions for UDP Health Checks?
Why Does ELB Frequently Send Requests to Backend Servers During Health Checks?
When Does a Health Check Start?
Do Maximum Retries Include Health Checks That Consider Backend Servers Unhealthy?
What Do I Do If a Lot of Access Logs Are Generated During Health Checks?
What Status Codes Will Be Returned If Backend Servers Are Identified as Healthy?
Obtaining Source IP Addresses
How Can I Transfer the IP Address of a Client?
HTTP/HTTPS Listeners
Which Protocol Should I Select for the Backend Server Group When Adding an HTTPS Listener?
Why Is There a Security Warning After a Certificate Is Configured?
Why Is a Forwarding Policy in the Faulty State?
Why Can't I Add a Forwarding Policy to a Listener?
Why Cannot I Select an Existing Backend Server Group When Adding a Forwarding Policy?
Sticky Sessions
What Are the Differences Between Persistent Connections and Sticky Sessions?
How Do I Check If Sticky Sessions Failed to Take Effect?
How Do I Test Sticky Sessions Using Linux Curl Commands?
What Types of Sticky Sessions Does ELB Support?
Certificates
How Can I Create Server Certificates and CA Certificates?
Does ELB Support Wildcard Certificates?
Why Is Access to Backend Servers Still Abnormal Even If I Have Created a Certificate?
Will the Network or Load Balancing Be Interrupted When a Certificate Is Being Replaced?
Monitoring
Why Is the Outgoing Rate on the ELB Console Inconsistent with the Bandwidth Usage Statistics on the Cloud Eye Console?
What Are the Differences Between Layer-7 Status Codes and Backend Status Codes in ELB Metrics?
Why Is There a Large Number of HTTP 499 Errors?
Change History
API Reference (Ankara Region)
Before You Start
API Overview
Calling APIs
Making an API Request
Authentication
Response
APIs (V3)
API Version
Querying API Versions
Quota
Querying Quotas
Querying Quota Usage
AZ
Querying AZs
Load Balancer
Querying Load Balancers
Viewing the Details of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Querying the Status Tree of a Load Balancer
Certificate
Creating a Certificate
Querying Certificates
Querying the Details of a Certificate
Updating a Certificate
Deleting a Certificate
Security Policy
Creating a Custom Security Policy
Querying Custom Security Policies
Querying the Details of a Custom Security Policy
Updating a Custom Security Policy
Deleting a Custom Security Policy
Querying System Security Policies
IP Address Group
Creating an IP Address Group
Querying IP Address Groups
Querying the Details of an IP Address Group
Updating an IP Address Group
Deleting an IP Address Group
Updating IP Addresses in an IP Address Group
Deleting IP Addresses from an IP Address Group
Listener
Adding a Listener
Querying Listeners
Viewing the Details of a Listener
Updating a Listener
Deleting a Listener
Backend Server Group
Creating a Backend Server Group
Querying Backend Server Groups
Querying the Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Viewing the Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Viewing the Details of a Health Check
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying the Details of a Forwarding Policy
Modifying a Forwarding Policy
Deleting a Forwarding Policy
Batch Modifying Forwarding Policy Priorities
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Viewing the Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
APIs (V2)
Load Balancer
Creating a Load Balancer
Querying Load Balancers
Querying Details of a Load Balancer
Querying the Status Tree of a Load Balancer
Updating a Load Balancer
Deleting a Load Balancer
Backend Server Group
Adding a Backend Server Group
Querying Backend Server Groups
Querying Details of a Backend Server Group
Updating a Backend Server Group
Deleting a Backend Server Group
Backend Server
Adding a Backend Server
Querying Backend Servers
Querying Details of a Backend Server
Updating a Backend Server
Removing a Backend Server
Health Check
Configuring a Health Check
Querying Health Checks
Querying Health Check Details
Updating a Health Check
Deleting a Health Check
Forwarding Policy
Adding a Forwarding Policy
Querying Forwarding Policies
Querying Details of a Forwarding Policy
Updating a Forwarding Policy
Deleting a Forwarding Policy
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Querying Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Whitelist
Adding a Whitelist
Querying Details of a Whitelist
Querying Whitelists
Updating a Whitelist
Deleting a Whitelist
Certificate
Creating a Certificate
Querying Certificates
Querying Details of a Certificate
Updating a Certificate
Deleting a Certificate
APIs (OpenStack)
Tag
Adding a Tag to a Load Balancer
Batch Adding Load Balancer Tags
Batch Deleting Load Balancer Tags
Querying All Tags of a Load Balancer
Querying the Tags of All Load Balancers
Querying Load Balancers by Tag
Deleting a Tag from a Load Balancer
Adding a Tag to a Listener
Batch Adding Tags to a Listener
Batch Deleting Tags from a Listener
Querying All Tags of a Listener
Querying the Tags of All Listeners
Querying Listeners by Tag
Deleting a Tag from a Listener
Status Codes
Permissions and Supported Actions
Supported Actions (V2)
Load Balancer
Listener
Backend Server Group
Backend Server
Health Check
Forwarding Policy
Forwarding Rule
Whitelist
SSL Certificate
Quota
Tag
Precautions for API Permissions
Supported Actions (V3)
Load Balancer
Listener
Backend Server Group
Backend Server
Health Check
Forwarding Policy
Forwarding Rule
IP Address Group
Certificate
Security Policy
Quota
API Version
Availability Zone
Load Balancer Flavor
Precautions for API Permissions
Appendix
Error Codes
Status Codes
Obtaining a Project ID
Querying Data in Pages
Change History
General Reference
Glossary
Service Level Agreement
White Papers
Endpoints
Permissions