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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FAQs
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How Does Cloud-Init Influence the AS Service?

How Does Cloud-Init Influence the AS Service?

Cloud-Init is an open-source cloud initialization program, which initializes specified customized configurations, such as the host name, key pair, and user data, of a newly created ECS. When creating an AS configuration, you can use Cloud-Init to initialize the ECS.

If Cloud-Init or Cloudbase-Init is not installed in the private image specified in an AS configuration for an AS group, the following cases occur on the instance created in a scaling action:

If an ECS created using a Windows private image without Cloudbase-Init installed is used, the system will display a message indicating that the password for logging in to the ECS cannot be obtained when you obtain the password. In such a case, you can log in to the ECS using only the image password. If the image password has been lost, you can use the password resetting function available on the Elastic Cloud Server page to reset the password.
If an ECS created using a Linux private image without Cloud-Init installed is used, the ECS cannot be logged in using the password or key pair configured during ECS creation. In such a case, you can log in to the ECS using only the image password or key pair. If the image password or key pair has been lost, you can use the password resetting function available on the Elastic Cloud Server page to reset the password.
If an ECS created using a private image without Cloud-Init or Cloudbase-Init installed is used, user data injection fails.
To prevent the preceding issues from occurring, check whether the private image in the AS configuration has Cloud-Init or Cloudbase-Init installed before using the AS service. Delete the AS configurations that use the private images without Cloud-Init or Cloudbase-Init installed. Use the private images with Cloud-Init or Cloudbase-Init installed to create new AS configurations. The procedure is as follows:
1. Log in to the management console.
2. Under Computing, click Auto Scaling.
3. Click the AS Configurations tab and query the AS configuration list.
4. Click Create AS Configuration and select a private image with Cloud-Init or Cloudbase-Init installed to create a desired AS configuration.
5. Change the AS configuration in the AS group to the newly created one.

Parent topic: Others