書名： Ansible 2 Cloud Automation Cookbook
作者名： Aditya Patawari Vikas Aggarwal
本章字數： 231字
更新時間： 2021-06-24 18:43:39

Creating auto scaling groups

So far, we have seen various services provided by AWS EC2. We have also seen the dynamic nature of the cloud that lets us spin any number of instances, volumes, load balancers, and so on.

When we deploy an application in production, we are likely to see non-uniform traffic patterns.

We might see a pattern where peak time starts at mid-afternoon and ends at midnight. For such cases, we might need to add more resources at certain times to keep our application latency uniform. Using auto scaling groups, we can achieve this goal. AWS EC2 provides three major components for auto scaling EC2 instances:

Launch Configurations act a template for auto scaling groups to launch EC2 instances. It contains information like the AMI ID, the security group, and so on required to launch an EC2 instance.
Auto Scaling Groups is a collection of EC2 instances which share similar characteristics. This is defined in the launch configuration. Auto scaling groups are configured with parameters such as a maximum number of instances, a minimum number of instances, scaling policies, and load balancers to manage EC2 instances.
Scaling Group Policies are policies attached to an auto scaling group, which define actions like scale up or scale down. These policies are hooked with CloudWatch metrics alarm, which notifies the policy to increase or decrease EC2 instances in auto scaling groups.

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Ansible 2 Cloud Automation Cookbook

Creating auto scaling groups