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
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 (Dedicated Load Balancers)
Permissions
Product Concepts
Basic Concepts
Region and AZ
How ELB Works with Other Services
Change History
Getting Started
Overview
Process Flowchart
Preparations for Using ELB
Using Load Balancers (Entry Level)
Using Load Balancers (Advanced Level)
Change History
User Guide
Load Balancer
Overview
Preparations for Creating a Load Balancer
Creating a Dedicated Load Balancer
Creating a Shared 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
Enabling or Disabling a Load Balancer
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 (Dedicated Load Balancers)
Transfer Client IP Address (Shared Load Balancers)
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
Transferring the Load Balancer EIP to Backend Servers
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)
Enabling Modification Protection
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/Ports
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/Ports
Supplementary Network Interfaces
Adding Supplementary Network Interfaces
Viewing Supplementary Network Interfaces
Removing Supplementary Network Interfaces
Changing the Weights/Ports of Supplementary Network Interfaces
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
Permissions Management
Creating a User and Granting Permissions
Creating a Custom Policy
Quotas
Appendix
Configuring the TOA Module
Change History
Best Practices
Viewing Traffic Usage
Routing Traffic to Backend Servers in Different VPCs
Overview
Routing Traffic to Backend Servers in Different VPCs from the Load Balancer
Routing Traffic to Backend Servers in the Same VPC as the Load Balancer
API Reference
Before You Start
Overview
API Calling
Notes and Constraints
Concepts
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 Flavor
Querying Flavors
Viewing Details of a Flavor
Reserved IP Address
Calculating the Number of Reserved IP Addresses
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
Forwarding Rule
Adding a Forwarding Rule
Querying Forwarding Rules
Viewing Details of a Forwarding Rule
Updating a Forwarding Rule
Deleting a Forwarding Rule
Log
Creating a Log
Querying Logs
Viewing Details of a Log
Updating a Log
Deleting a Log
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
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
Appendix
Error Codes
Status Codes
Monitoring Metrics
Obtaining a Project ID
SDK Reference
SDK Overview
FAQs
Popular Questions
ELB Use
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?
Can ELB Block DDoS Attacks and Secure Web Code?
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?
Are There Any Restrictions on the Frequency of Access from an IP Address?
Can ELB Be Used Across Accounts or VPCs?
Can Backend Servers Access the Ports of a Load Balancer?
Can I Bind a Public IP Address Purchased from a Third-Party Cloud Provider to My Load Balancer?
Can Both the Listener and Backend Server Group Use HTTPS?
Can I Change the VPC and Subnet for My Load Balancer?
Does ELB Support IPv6 Networks?
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
What Is Quota?
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 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 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?
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?
Do HTTP and HTTP Listeners Support the X-Forwarded-Host Header?
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 and What Are the Default Durations?
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 Distribute Traffic Across Servers That Are Not Provided by Huawei Cloud?
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 Long Is the Timeout Duration of Connections Between a Load Balancer and Backend Servers?
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?
How Much Time Is Required for a Load Balancer to Disconnect from Backend Servers After The Servers Are Removed?
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?
How Can an EIP Bound to a Load Balancer Be Transmitted to Backend Servers?
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?
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?
Can I Modify the Bandwidth of a Load Balancer?
What Functions Will Become Unavailable If a Load Balancer Is Frozen?
Videos