- 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
Scaling Your Website Dynamically
-
Auto Scaling (AS) adjusts compute resources based on service requirements and the policies you configure.
-
You can specify AS configurations and policies based on service requirements. These configurations and policies free you from having to repeatedly adjust resources to keep up with service changes, and help you reduce resource and labor costs.
-
Assume that your e-Commerce website runs on ECS ecs-c9b4 in Huawei Cloud. You plan to launch a big promotion at 00:00 on a certain day. To respond to the demand spike during the promotion, you can take the following measures.
Step 1: Create an AS Configuration
1. Log in to the management console.
2. Choose Service List > Compute > Auto Scaling.
3. Click Create AS Configuration.
4. Configure parameters and click Create Now.
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/86a9f9341289984c6689f3637949ab74.png)
Note
1. Set Configuration Template to Use existing ECS and select ECS ecs-c9b4. You can also create AS configuration from scratch.
2. Select Key pair for Login Mode. You can also log in to an ECS using a password.
3. Advanced Settings is optional. You can inject user data as text or file.
1
Accessing Auto Scaling
![Apply for a VPC.](https://support.huaweicloud.com/intl/en-us/qs-as/files/ab773ba5cd8e061c41583a9a91253c9d.png)
2
Creating an AS configuration
![Apply for an ECS.](https://support.huaweicloud.com/intl/en-us/qs-as/files/45d20f38da31d023bdfaae78a17c128d.png)
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/01ef21b7c3ac40a4036a9108f6c53df9.png)
View Image
Step 2: Create an AS Group
1. On the Instance Scaling page, click Create AS Group.
2. Configure parameters and click Now.
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/86a9f9341289984c6689f3637949ab74.png)
Note
1. When specifying AZ, ensure that the AZ where ECS ecs-c9b4 resides is selected.
2. Set both Min. Instances and Expected Instances to 0 and Max. Instances to 10.
3. Select the AS configuration you created.
4. Select the VPC where ECS ecs-c9b4 resides.
5. Select Elastic load balancer for Load Balancing. Access traffic will be automatically distributed to all available ECSs in the AS group.
6. Select ECS health check for Health Check Method.
1
Creating an AS group (1)
![Select the charging mode.](https://support.huaweicloud.com/intl/en-us/qs-as/files/3cfbfdb02380cfffb3ab7ee5bf56acb4.png)
2
Creating an AS group (2)
![Select the charging mode.](https://support.huaweicloud.com/intl/en-us/qs-as/files/a17bc7000c9a3b8d3d5d0aa2c5e3add4.png)
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/01ef21b7c3ac40a4036a9108f6c53df9.png)
View Image
Step 3: Add an AS Policy
1. On the AS Groups page, locate the created AS group and click View AS Policy.
2. Click Add AS Policy to add an AS policy for the AS group.
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/86a9f9341289984c6689f3637949ab74.png)
Note
You can also click the AS group name, click the AS Policies tab, and then click Add AS Policy.
1
Viewing the AS policy
![Select the charging mode.](https://support.huaweicloud.com/intl/en-us/qs-as/files/d072dafa4d511beaa62d3f445f581740.png)
2
Adding an AS policy
![选择实例配置](https://support.huaweicloud.com/intl/en-us/qs-as/files/cd9466232342ffd4d6a08c47dd373788.png)
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/01ef21b7c3ac40a4036a9108f6c53df9.png)
View Image
Step 4: Configure AS Policy Parameters
1. Select Alarm for Policy Type.
2. Set Trigger Condition to Max. CPU Usage > 90%.
3. Set Scaling Action to Add 2 instances.
4. Retain the default setting for Cooldown Period.
5. Click OK.
1
Configuring AS policy parameters
![Select the charging mode.](https://support.huaweicloud.com/intl/en-us/qs-as/files/f4d1dae8dea9c4f33eb4223679ecbe76.png)
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/01ef21b7c3ac40a4036a9108f6c53df9.png)
View Image
Step 5: Manually Add Instances to the AS Group
1. Click the name of the created AS group and click the Instances tab.
2. Click Add, select the instances to be added, and click OK.
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/86a9f9341289984c6689f3637949ab74.png)
Note
You can add instances to an AS group only if the AS group is enabled and has no ongoing scaling action, and the number of current instances is less than the maximum number of instances.
1
Manually adding instances to an AS group
![Select the charging mode.](https://support.huaweicloud.com/intl/en-us/qs-as/files/a682e9b94e426119fb10d78cd25e1c00.png)
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/01ef21b7c3ac40a4036a9108f6c53df9.png)
View Image
Step 6: View Monitoring Data
View monitoring data of the AS group. The figure on the right suggests that:
1. The AS group contained no instance after it was created. After Expected Instances was changed to 2, a scaling action was triggered and two ECSs were added to the AS group.
2. The CPU usage stayed stable.
AS monitors CPU usage in real time and performs scaling actions based on the policy you configured. This helps you save money by increasing and decreasing compute capacity as needed.
1
Viewing monitoring data
![Select the charging mode.](https://support.huaweicloud.com/intl/en-us/qs-as/files/5bb09685f8e082d33c5e453b1c3adee0.png)
![](https://support.huaweicloud.com/intl/en-us/qs-as/files/01ef21b7c3ac40a4036a9108f6c53df9.png)
View Image
Feedback
Was this page helpful?
Provide feedbackThank you very much for your feedback. We will continue working to improve the documentation.See the reply and handling status in My Cloud VOC.
For any further questions, feel free to contact us through the chatbot.
Chatbot