Scaling Policies allow you to set parameter for the scaling groups in and out operations. Typical things you would place scaling policies on are: CPUUtilization and RequestCountPerTarget. Policies have a cool-down period for both in and out scaling with a default of 300seconds or 5 minutes. The ASG will add or remove one instance at a time and evaluate if further increase or decrease is necessary. Using standard AMI allows your cool-down period to be reduced because you will see the effects of adding or removing instances quicker.
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1. Logon to AWS as an IAM user at URL: https://signin.aws.amazon.com/
2. From the Home Console type EC2 in the search bar, select the star next to EC2, and select EC2
3. On the left hand menu bar select Auto Scaling Groups.
4. Select the ASG you wish to create a policy for and scroll down to Automatic scaling. Under Under here you can setup three different types:
- •.Dynamic scaling policies – based on percentage of use of CPU, Connects,etc
- •.Predictive scaling policies – based on EventWatch alerts.
- •.Scheduled actions – based on times ie working hours or work days.
Dynamic scaling policies:
5. Predictive scaling policies:
6. Scheduled Actions:
7. Select Select metric button and chose the metric that best fits.
