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- What's New
- Function Overview
- Service Overview
- Getting Started
- User Guide
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
APIs
- AS Groups
- AS Configurations
- Instances
-
AS Policies
- Creating an AS Policy
- Creating an AS Policy (V2)
- Modifying an AS Policy
- Modifying an AS Policy (V2)
- Querying AS Policies Bound to an AS Group
- Querying AS Policies Bound to a Scaling Resource (V2)
- Querying AS Policies (V2)
- Querying an AS Policy
- Querying an AS Policy (V2)
- Executing, Enabling, or Disabling an AS Policy
- Deleting an AS Policy
- Batch Managing AS Policies
- AS Policy Execution Logs
- Scaling Action Logs
- Quotas
- Notifications
- Lifecycle Hooks
- Tags
- Planned Tasks
- API Version Query
- Application Examples
- Permissions and Supported Actions
- Appendix
- Change History
- SDK Reference
-
FAQ
-
General
- What Are Restrictions on Using AS?
- Must I Use AS Together With ELB and Cloud Eye?
- Is AS Billed?
- Will an Abrupt Change in Monitoring Metric Values Trigger an Unnecessary Scaling Action?
- How Many AS Policies and AS Configurations Can I Create and Use?
- Can AS Automatically Scale Up or Down vCPUs, Memory, and Bandwidth of ECSs?
- What Is an AS Quota?
- How Do I Fix the Error "The key pair does not exist" When I Connect to an Instance?
- What Types of EIP and Shared Bandwidths Can Be Adjusted by AS?
- What Types of ECS and HECS Instances Can Be Scaled by AS?
- If the OS of an ECS Instance in an AS Group Is Upgraded, Can AS Automatically Add Instances with the Newest OS During the Next Scale-out Action?
- Can AS Add Yearly/Monthly ECS Instances When It Scales Out an AS Group?
- Can AS Increase Bandwidths as Required?
- AS Group
-
AS Policy
- How Many AS Policies Can I Enable?
- What Are the Conditions to Trigger an Alarm-based AS Policy?
- What Is a Cooldown Period and Why Is It Required?
- Can AS Scale Capacity Based on Custom Monitoring by Cloud Eye?
- What Monitoring Metrics for an AS Group Will Be Affected If VM Tools Are Not Installed on the Instances in the Group?
- What Can I Do If an AS Policy Fails to Be Enabled?
- How Do I Install the Agent on Instances in an AS Group to Use Agent Monitoring Metrics?
-
Instance
- How Do I Prevent Instances Manually Added to an AS Group from Being Automatically Removed?
- When There Are Multiple Flavors Included in the AS Configuration of an AS Group, What Order Are the Flavors Selected in During Scale-out Events?
- When an Instance Is Removed from an AS Group and Deleted, Is the Application Data Saved?
- Can I Add Yearly/Monthly ECS Instances to an AS Group?
- Can the System Automatically Delete the Instances Added Based on an AS Policy When They Are Not Required?
- What Is the Expected Number of Instances?
- How Do I Delete an ECS Instance Created in a Scaling Action?
- Will a Yearly/Monthly ECS Instance Be Deleted If It Becomes Unhealthy?
- How Do I Handle Unhealthy Instances in an AS Group?
- Why Instances in an AS Group Keep Failing Health Checks and Getting Deleted and Recreated?
- How Do I Prevent Instances from Being Automatically Removed from an AS Group?
- Why Is an Instance that Was Removed from an AS Group and Deleted Still Displayed in the ECS List?
- Do I Need to Bind an EIP to an Instance Before I Manually Add the Instance to an AS Group?
- Can I Apply the Configurations of an Existing Instance in an AS Group to Instances to Be Added in the Future?
- Will the System Bind a New EIP or an Existing One a Newly Added ECS Instance?
-
Others
- How Can I Automatically Deploy My Application on an Instance?
- How Does Cloud-Init Affect the AS Service?
- Why Can't I Use a Key File to Log In to an ECS?
- Do I Need to Configure an EIP in an AS Configuration When a Load Balancer Has Been Enabled for an AS Group?
- How Do I Enable Automatic Initialization of EVS Disks on Instances that Have Been Added to an AS Group During Scaling Actions?
-
General
- Videos
- Glossary
-
More Documents
-
User Guide (ME-Abu Dhabi Region)
- Service Overview
- Best Practices
- Quick Start
- AS Management
-
FAQs
-
General
- What Are Restrictions on Using AS?
- Are ELB and Cloud Eye Mandatory for AS?
- Is AS Billed?
- Does an Abrupt Change on Monitoring Indicator Values Cause an Incorrect Scaling Action?
- How Many AS Policies and AS Configurations Can I Create and Use?
- Can AS Automatically Scale Up or Down vCPUs, Memory, and Bandwidth of ECSs?
- What Is the AS Quota?
- Why is a message displayed indicating that the key pair does not exist and the operation is discontinued when several users under the same account operate AS resources?
- AS Group
-
AS Policy
- How Many AS Policies Can Be Enabled?
- What Are the Conditions to Trigger an Alarm in the AS Policy?
- What Is a Cooldown Period? Why Is It Required?
- Can AS Scale Capacity Based on Custom Monitoring of Cloud Eye?
- What Will Monitoring Metrics for an AS Group Be Affected If VM Tools Are Not Installed on ECSs?
- What Can I Do If an AS Policy Fails to Be Enabled?
- How Can I Install the Agent Plug-in on the Instances in an AS Group to Use Agent Monitoring Metrics?
-
Instance
- How Do I Prevent Instances Manually Added to an AS Group from Being Removed Automatically?
- What Are the Sequence of Selecting Flavors in Multi-Flavor AS Configuration?
- Will the Application Data on an Instance Be Retained After the Instance Is Removed from an AS Group and Deleted?
- Can I Add ECSs Charged in Yearly/Monthly Mode?
- Can Instances That Have Been Added Based on an AS Policy Be Automatically Deleted When They Are Not Required?
- What Is the Expected Number of Instances?
- How Do I Delete an ECS Created in a Scaling Action?
- Will a Yearly/Monthly ECS Be Deleted When the ECS Becomes Faulty?
- How Should I Handle Abnormal Instances in an AS Group?
- What Can I Do If Instances in an AS Group Frequently Fail in Health Checks and Are Deleted and Then Created Repeatedly?
- How Do I Prevent ECSs from Being Removed from an AS Group Automatically?
- Why Is an Instance Removed and Deleted from an AS Group Still Displayed in the ECS List?
-
Others
- What Can I Do to Enable My Application to Be Automatically Deployed on an Instance?
- How Does Cloud-Init Affect the AS Service?
- How Can I Run Existing Services on an Instance Newly Added to an AS Group?
- Why Cannot I Use a Key File to Log In to an ECS?
- Do I Need to Configure an EIP in an AS Configuration When A Load Balancer Has Been Enabled in an AS Group?
- How Can I Enable Automatic Initialization of EVS Disks of Instances That Have Been Added in a Scaling Action to an AS Group?
-
General
- Change History
-
API Reference (ME-Abu Dhabi Region)
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
API
- AS Groups
- AS Configurations
- Instances in an AS Group
-
AS Policies
- Creating an AS Policy
- Creating an AS Policy (V2)
- Modifying an AS Policy
- Modifying an AS Policy (V2)
- Querying AS Policies
- Querying AS Policies (V2)
- Querying All AS Policies (V2)
- Querying AS Policy Details
- Querying Details of an AS Policy (V2)
- Executing, Enabling, or Disabling an AS Policy
- Deleting an AS Policy
- Performing Operations on AS Policies in Batches
- AS Policy Execution Logs
- Scaling Action Logs
- Quotas
- Notifications
- Lifecycle Hook
- Tag Management
- API Management
- Permissions Policies and Supported Actions
- Appendix
- Change History
-
User Guide (Paris Regions)
- Service Overview
- Best Practices
- Quick Start
- AS Management
-
FAQs
-
General
- What Are Restrictions on Using AS?
- Must I Use AS Together With ELB and Cloud Eye?
- Will an Abrupt Change in Monitoring Metric Values Trigger an Unnecessary Scaling Action?
- How Many AS Policies and AS Configurations Can I Create and Use?
- How Do I Fix the Error "The key pair does not exist" When I Connect to an Instance?
- AS Group
-
AS Policy
- How Many AS Policies Can I Enable?
- What Are the Conditions to Trigger an Alarm-based AS Policy?
- What Is a Cooldown Period and Why Is It Required?
- What Monitoring Metrics for an AS Group Will Be Affected If VM Tools Are Not Installed on the Instances in the Group?
- What Can I Do If an AS Policy Fails to Be Enabled?
-
Instance
- How Do I Prevent Instances Manually Added to an AS Group from Being Automatically Removed?
- When an Instance Is Removed from an AS Group and Deleted, Is the Application Data Saved?
- Can AS Automatically Delete Instances Added Based on an AS Policy When They Are Not Required?
- What Is the Expected Number of Instances?
- How Do I Delete an ECS Instance Created in a Scaling Action?
- How Do I Handle Unhealthy Instances in an AS Group?
- Why Instances in an AS Group Keep Failing Health Checks and Getting Deleted and Recreated?
- How Do I Prevent Instances from Being Automatically Removed from an AS Group?
- Why Is an Instance that Was Removed from an AS Group and Deleted Still Displayed in the ECS List?
-
Others
- How Can I Automatically Deploy My Application on an Instance?
- Why Can't I Use a Key File to Log In to an ECS?
- Do I Need to Configure an EIP in an AS Configuration When a Load Balancer Has Been Enabled for an AS Group?
- How Do I Enable Automatic Initialization of EVS Disks on Instances that Have Been Added to an AS Group During Scaling Actions?
-
General
- Change History
- API Reference (Paris Regions)
-
User Guide (Kuala Lumpur Region)
- Service Overview
- Best Practices
- Quick Start
- AS Management
-
FAQs
-
General
- What Are Restrictions on Using AS?
- Must I Use AS Together With ELB and Cloud Eye?
- Is AS Billed?
- Will an Abrupt Change in Monitoring Metric Values Trigger an Unnecessary Scaling Action?
- How Many AS Policies and AS Configurations Can I Create and Use?
- Can AS Automatically Scale Up or Down vCPUs, Memory, and Bandwidth of ECSs?
- What Is an AS Quota?
- How Do I Fix the Error "The key pair does not exist" When I Connect to an Instance?
- AS Group
-
AS Policy
- How Many AS Policies Can I Enable?
- What Are the Conditions to Trigger an Alarm-based AS Policy?
- What Is a Cooldown Period and Why Is It Required?
- Can AS Scale Capacity Based on Custom Monitoring by Cloud Eye?
- What Monitoring Metrics for an AS Group Will Be Affected If VM Tools Are Not Installed on the Instances in the Group?
- What Can I Do If an AS Policy Fails to Be Enabled?
- How Do I Install the Agent on Instances in an AS Group to Use Agent Monitoring Metrics?
-
Instance
- How Do I Prevent Instances Manually Added to an AS Group from Being Automatically Removed?
- When There Are Multiple Flavors Included in the AS Configuration of an AS Group, What Order Are the Flavors Selected in During Scale-out Events?
- When an Instance Is Removed from an AS Group and Deleted, Is the Application Data Saved?
- Can I Add Yearly/Monthly ECS Instances to an AS Group?
- Can the System Automatically Delete the Instances Added Based on an AS Policy When They Are Not Required?
- What Is the Expected Number of Instances?
- How Do I Delete an ECS Instance Created in a Scaling Action?
- Will a Yearly/Monthly ECS Instance Be Deleted If It Becomes Unhealthy?
- How Do I Handle Unhealthy Instances in an AS Group?
- Why Instances in an AS Group Keep Failing Health Checks and Getting Deleted and Recreated?
- How Do I Prevent Instances from Being Automatically Removed from an AS Group?
- Why Is an Instance that Was Removed from an AS Group and Deleted Still Displayed in the ECS List?
-
Others
- How Can I Automatically Deploy My Application on an Instance?
- How Does Cloud-Init Affect the AS Service?
- Why Can't I Use a Key File to Log In to an ECS?
- Do I Need to Configure an EIP in an AS Configuration When a Load Balancer Has Been Enabled for an AS Group?
- How Do I Enable Automatic Initialization of EVS Disks on Instances that Have Been Added to an AS Group During Scaling Actions?
-
General
- Change History
-
API Reference (Kuala Lumpur Region)
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
APIs
- AS Groups
- AS Configurations
- Instances in an AS Group
-
AS Policies
- Creating an AS Policy
- Creating an AS Policy (V2)
- Modifying an AS Policy
- Modifying an AS Policy (V2)
- Querying AS Policies
- Querying AS Policies (V2)
- Querying All AS Policies (V2)
- Querying AS Policy Details
- Executing, Enabling, or Disabling an AS Policy
- Deleting an AS Policy
- Performing Operations on AS Policies in Batches
- AS Policy Execution Logs
- Scaling Action Logs
- Quotas
- Notifications
- Lifecycle Hook
- Tag Management
- API Management
- Permissions Policies and Supported Actions
- Appendix
- Change History
-
User Guide (Ankara Region)
- Service Overview
- Best Practices
- Quick Start
- AS Management
-
FAQs
-
General
- What Are Restrictions on Using AS?
- Must I Use AS Together With ELB and Cloud Eye?
- Will an Abrupt Change in Monitoring Metric Values Trigger an Unnecessary Scaling Action?
- How Many AS Policies and AS Configurations Can I Create and Use?
- How Do I Fix the Error "The key pair does not exist" When I Connect to an Instance?
- AS Group
-
AS Policy
- How Many AS Policies Can I Enable?
- What Are the Conditions to Trigger an Alarm-based AS Policy?
- What Is a Cooldown Period and Why Is It Required?
- What Monitoring Metrics for an AS Group Will Be Affected If VM Tools Are Not Installed on the Instances in the Group?
- What Can I Do If an AS Policy Fails to Be Enabled?
-
Instance
- How Do I Prevent Instances Manually Added to an AS Group from Being Automatically Removed?
- When an Instance Is Removed from an AS Group and Deleted, Is the Application Data Saved?
- Can AS Automatically Delete Instances Added Based on an AS Policy When They Are Not Required?
- What Is the Expected Number of Instances?
- How Do I Delete an ECS Instance Created in a Scaling Action?
- How Do I Handle Unhealthy Instances in an AS Group?
- Why Instances in an AS Group Keep Failing Health Checks and Getting Deleted and Recreated?
- How Do I Prevent Instances from Being Automatically Removed from an AS Group?
- Why Is an Instance that Was Removed from an AS Group and Deleted Still Displayed in the ECS List?
-
Others
- How Can I Automatically Deploy My Application on an Instance?
- How Does Cloud-Init Affect the AS Service?
- Why Can't I Use a Key File to Log In to an ECS?
- Do I Need to Configure an EIP in an AS Configuration When a Load Balancer Has Been Enabled for an AS Group?
- How Do I Enable Automatic Initialization of EVS Disks on Instances that Have Been Added to an AS Group During Scaling Actions?
-
General
- Change History
-
API Reference (Ankara Region)
- Before You Start
- API Overview
- Calling APIs
- Getting Started
-
APIs
- AS Groups
- AS Configurations
- Instances
-
AS Policies
- Creating an AS Policy
- Creating an AS Policy (V2)
- Modifying an AS Policy
- Modifying an AS Policy (V2)
- Querying AS Policies Bound to an AS Group
- Querying AS Policies Bound to a Scaling Resource (V2)
- Querying AS Policies (V2)
- Querying an AS Policy
- Querying an AS Policy (V2)
- Executing, Enabling, or Disabling an AS Policy
- Deleting an AS Policy
- Batch Managing AS Policies
- AS Policy Execution Logs
- Scaling Action Logs
- Quotas
- Notifications
- Lifecycle Hooks
- API Version Query
- Permissions and Supported Actions
- Appendix
- Change History
-
User Guide (ME-Abu Dhabi Region)
- General Reference
Show all
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Creating an AS Group Quickly
If you are using AS for the first time, following the wizard-based process is an easy way to create an AS group, AS configuration, and AS policy.
Prerequisites
- You have created the required VPCs, subnets, security groups, and load balancers.
- You have obtained the keys for logging in to the instances added by a scaling action.
Procedure
- Log in to the management console.
- Under Computing, click Auto Scaling.
- Click Create AS Group.
- Set basic information about the AS group, such as Name, Max. Instances, Min. Instances, and Expected Instances. Table 1 lists the parameters.
Table 1 AS group parameters Parameter
Description
Example Value
Name
Specifies the name of the AS group to be created.
The name contains 1 to 64 characters and consists of only letters, digits, underscores (_), and hyphens (-).
N/A
Max. Instances
Specifies the maximum number of ECS instances in an AS group.
1
Expected Instances
Specifies the expected number of ECS instances in an AS group.
After an AS group is created, you can change this value, which will trigger a scaling action.
0
Min. Instances
Specifies the minimum number of ECS instances in an AS group.
0
Cooldown Period
Specifies how long (in seconds) any alarm-triggered scaling action will be disallowed after a previous scaling action is complete. During the cooldown period, AS denies all scaling requests triggered by alarm-based policies. Scaling requests triggered manually or by scheduled or periodic policies are not affected.
NOTE:
- If a scaling action is triggered by an AS policy, the cooldown period is whatever configured for that AS policy.
- If a scaling action is triggered by manually changing the expected number of instances or by other actions, the cooldown period is whatever configured for the AS group.
- When an AS group scales out, scale-in requests triggered manually or by scheduled or periodic policies will be executed immediately after the scale-out is complete, without being affected by the cooldown period.
- When an AS group scales in, scale-out requests triggered manually or by scheduled or periodic policies will be executed immediately after the scale-in is complete, without being affected by the cooldown period.
300
AZ
An AZ is a physical location where resources use independent power supply and networks. AZs are physically isolated but interconnected through an internal network.
To enhance application availability, the system evenly distributes your instances between AZs if multiple AZs have been selected.
N/A
VPC
Provides a network for your ECS instances.
All ECS instances in the AS group are deployed in this VPC.
N/A
Subnet
You can select up to five subnets. The AS group automatically binds all NICs to the created ECSs. The first subnet is used by the primary NIC of an ECS instance by default, and other subnets are used by extension NICs of the instance.
N/A
Security Group
Controls ECS access within or between security groups by defining access rules. ECSs added to a security group are protected by the access rules you define.
N/A
Load Balancing
This parameter is optional. A load balancer automatically distributes traffic across all instances in an AS group to balance their service load. It improves the fault tolerance of your applications and expands application service capabilities.
NOTE:
- Up to six load balancers can be added to an AS group.
- After multiple load balancers are added to an AS group, multiple services can be concurrently listened to, thereby improving service scalability. If ELB health check is selected for Health Check Method, when any one of the listeners detects that an instance becomes unhealthy, AS will replace the faulty instance with a functional one.
If you select load balancer, configure the following parameters:
- Load Balancer
- Listener
N/A
Instance Removal Policy
Specifies the priority for removing instances from an AS group. If specified conditions are met, scaling actions are triggered to remove instances. AS supports the following instance removal policies:
- Oldest instance created from oldest AS configuration: The oldest instance created from the oldest configuration is removed from the AS group first.
- Newest instance created from oldest AS configuration: The newest instance created from the oldest configuration is removed from the AS group first.
- Oldest instance: The oldest instance is removed from the AS group first.
- Newest instance: The newest instance is removed from the AS group first.
NOTE:
- Removing instances will preferentially ensure that the remaining instances are load balanced in AZs.
- Manually added ECS instances are the last to be removed. If AS does remove a manually added instance, it only removes the instance from the AS group. It does not delete the instance. If multiple manually added instances must be removed, AS preferentially removes the earliest-added instance first.
N/A
EIP
If EIP has been selected in an AS configuration for an AS group, an EIP is automatically bound to the ECS instance added to the AS group. If you select Release, the EIP bound to an instance is released when the instance is removed from the AS group. Otherwise, the system unbinds the EIP from the instance, but does not release it when the instance is removed from the AS group.
N/A
Health Check Method
When a health check detects a faulty ECS, AS removes the faulty ECS from the AS group and adds a new one. The health check is implemented using any of the following methods:
- ECS health check: checks the ECS instance running status. If an instance is stopped or deleted, it is considered unhealthy. This method is selected by default. Using this method, the AS group periodically determines the running status of each ECS instance based on the health check result. If the health check results show that an instance is unhealthy, AS removes the instance from the AS group.
- ELB health check: determines ECS running status using a load balancing listener. This health check method is available only when the AS group uses a load balancing listener. When a load balancing listener detects that an ECS is faulty, AS removes the ECS from the AS group.
N/A
Health Check Interval
Specifies the health check period for an AS group. You can set a proper health check interval, such as 10 seconds, 1 minute, 5 minutes, 15 minutes, 1 hour, and 3 hours based on the site requirements.
5 minutes
Release EIP on Instance Removal
If EIP has been selected in an AS configuration for an AS group, an EIP is automatically bound to each new ECS instance added during scaling actions. If you select the check box before Yes, the EIP bound is released when an instance is removed from the AS group. Otherwise, the system unbinds the EIP from the instance, but does not release it when the instance is removed from the AS group.
N/A
- Click Next.
- On the displayed page, you can use an existing AS configuration or create an AS configuration. For details, see Creating an AS Configuration from an Existing ECS Instance and Creating an AS Configuration from a New Specifications Template.
- Click Next.
- (Optional) Add an AS policy to an AS group.
On the displayed page, click Add AS Policy.
Configure the required parameters, such as the Policy Type, Scaling Action, and Cooldown Period. For details, see Dynamic Scaling and Scheduled Scaling.NOTE:
- If a scaling action is triggered by an AS policy, the cooldown period is whatever configured for that AS policy.
- If a scaling action is triggered by manually changing the expected number of instances or by other actions, the cooldown period is whatever configured for the AS group.
- Click Next.
- (Optional) Configure notification for the AS group.
For details, see Configuring Notifications for an AS Group.
- Click Next.
- Check the AS group, AS configuration, and AS policy information. Click Submit.
- Confirm the creation result and go back to the AS Groups page as prompted.
After the AS group is created, its status changes to Enabled.
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