User Guide

Service Overview
What Is AS?
Product Advantages
- Advantages
- Scaling Resources Based on Demand
- Using ELB with AS
Lifecycle
Use Restrictions
Related Services
Basic Concepts
- AS Group
- AS Configuration
- Scaling Actions
Best Practice
Deploying the Auto Scaling Discuz Forum Website
Quick Start
Wizard-based Process of Using AS
Creating an AS Group Quickly
AS Management
AS Groups
- Creating an AS group
- (Optional) Adding a Load Balancer to an AS Group
- Replacing an AS Configuration in an AS Group
- Enabling an AS Group
- Disabling an AS Group
- Modifying an AS Group
- Deleting an AS Group
AS Configurations
- Creating an AS configuration
- Using an Existing ECS to Create an AS Configuration
- Using a New Specifications Template to Create an AS Configuration
- Copying an AS Configuration
- Deleting an AS Configuration
Scaling Actions
- Dynamically Expanding Resources
- Expanding Resources as Planned
- Manually Expanding Resources
- Configuring an Instance Removal Policy
- Viewing a Scaling Action
- Managing Lifecycle Hooks
- Managing Scaling Policies
- Configuring Instance Protection
Monitoring AS Groups and Instances
- Checking Instance Health Status
- Configuring Notification for an AS Group
- Recording AS Resource Operations
- Marking AS Groups and ECSs
- Monitoring Metrics
- Viewing Metrics
- Setting Monitoring Alarm Rules
FAQs
General
- What Is AS?
- What Are Restrictions on Using AS?
- Does an Abrupt Change on Monitoring Indicator Values Cause an Incorrect Scaling Action?
- Are ELB and Cloud Eye Mandatory for AS?
- How Many AS Policies and AS Configurations Can I Create and Use?
AS Group
- What Can I Do If the AS Group Fails to Be Enabled?
- Why Does Not the ELB Health Check Used by an AS Group Take Effect Immediately?
- What Operation Will Be Suspended After An AS Group Is Disabled?
- What Is Health Check Grace Period?
- How Can I Handle an AS Group Exception?
AS Policy
- How Many AS Policies Can Be Enabled?
- What Can I Do If an AS Policy Fails to Be Enabled?
- What Is a Cooldown Period? Why Is It Required?
- What Are the Conditions to Trigger an Alarm in the AS Policy?
- What Will Monitoring Metrics for an AS Group Be Affected If VM Tools Are Not Installed on ECSs?
Instance
- How Do I Delete an ECS Created During a Scaling Action?
- Will the Application Data on an Instance Be Retained After the Instance Is Removed from an AS Group and Deleted?
- How Do I Prevent ECSs from Being Removed from an AS Group Automatically?
- How Should I Handle Abnormal Instances in an AS Group?
- What Is the Expected Number of Instances?
- Why Do Instances in an AS Group Frequently Fail Health Checks and Are Deleted And Then Created Repeatedly?
- Can Instances That Have Been Added Based on an AS Policy Be Automatically Deleted When They Are Not Required?
Others
- What Can I Do to Enable My Application to Be Automatically Deployed on an Instance?
- How Can I Enable Automatic Initialization of EVS Disks of Instances That Have Been Added in a Scaling Action to an AS Group?
- Why Cannot I Use a Key File to Log In to an ECS?
- How Does Cloud-Init Influence the AS Service?
- Do I Need to Configure an EIP in an AS Configuration When A Load Balancer Has Been Enabled in an AS Group?
Change History

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Help Center
Change History

Change History

Released On	What's New
2018-11-30	This issue is the tenth official release. Modified the following content: The cooldown period starts after a scaling action is complete and the default cooldown period is 300 seconds. Added FAQ "What Is a Cooldown Period? How Is It Calculated?"
2018-07-30	This issue is the ninth official release. Modified the following content: Added FAQ "Will the Data on an Instance Be Retained After the Instance Is Removed from an AS Group and Deleted?" Added 10s and 1 min as new options for the health check interval in section Creating an AS group.
2018-06-30	This issue is the eighth official release. Modified the following content: Added FAQ "What Can I Do If an AS Policy Fails to Be Enabled?". Added FAQ "How Do I Prevent ECSs in an AS Group from Being Removed Automatically?".
2018-05-30	This issue is the seventh official release. Modified the following content: Added "View Audit Logs" to section Recording AS Resource Operations. Added section Monitoring Metrics. Added section Viewing Metrics. Added section Setting Monitoring Alarm Rules. Added FAQ "What Can I Do If the AS Group Fails to Be Enabled?". Added FAQ "Why Does Not the ELB Health Check Used by an AS Group Take Effect Immediately?". Added FAQ "How Should I Handle Abnormal Instances in an AS Group?".
2018-04-30	This issue is the sixth official release. Modified the following content: Added FAQ "How Do I Delete an ECS Created During a Scaling Action?".
2018-05-30	This issue is the fifth official release. Modified the following content: Added description of forcible AS group deletion. Optimized description of the instance health check.
2017-11-30	This issue is the fourth official release. Modified the following content: Added AS metrics. Added the function of expanding or reducing the number of instances in an AS group according to the percentage preset in the AS policy. Added the function of creating data or system disks in DSS and of creating a data disk using a data disk image.
2017-09-30	This issue is the third official release. Modified the following content: Added a section for instance protection. Added a section for best practices.
2017-08-30	This issue is the second official release. Modified the following content: Optimized the wizard-based AS creation process. You must create or use an existing AS configuration after creating an AS group. Added Change AS Configuration in the More drop-down list and View AS Policy in the Operation column on the AS Groups page. Added the lifecycle hook feature.
2017-02-14	This issue is the first official release.