Auto Scaling
The following configuration allows me to sleep at night. It ensures that at least one EC2 instance will be running at any one time. ?The Auto Scaling CLI provided by Amazon is a simple tool that’s required for this configuration. To successfully configure auto scaling you need to follow these 2 steps:
1. Create launch configuration
2. Create Auto Scaling Group
So here we go:
- Download and install Auto Scaling CLI from?here
- Create launch configuration
as-create-launch-config MyLaunchConfig --image-id ami-xxxxxxxx --instance-type m1.small --user-data-file mystartupfile.sh --group mysecuritygroup
Successful creation should return
OK-Created launch config
- Greate Auto Scaling Group
as-create-auto-scaling-group MyGroup --launch-configuration MyLaunchConfig --availability-zones us-west-1a us-west-1b --min-size 1 --max-size 1 --load-balancers my-load-balancer
- You can then verify your Auto Scaling group
as-describe-auto-scaling-groups --headers
- To verify that MyGroup contains an EC2 instance:
as-describe-auto-scaling-instances --headers
Be aware of the fact that your Auto Scaling is now configured and running.
To Remove All EC2 Instances from the Group
- You must terminate all EC2 instances in an Auto Scaling group before you can delete the group. A?simple way to terminate all instances in a group is to update the group so that both the minimum size and?maximum size are set to zero.
as-update-auto-scaling-group MyGroup --min-size 0 --max-size 0
This should terminate the EC2 instance for this auto scaling group. You can run the ‘describe’ command to verify this
- Delete Auto Scaling group
as-delete-auto-scaling-group MyGroup Are you sure you want to delete this AutoScalingGroup? [Y/N]
Press Y to confirm deletion and you should see this:
OK-Deleted AutoScalingGroup
Now delete the configuration
as-delete-launch-config MyLaunchConfig Are you sure you want to delete this launch configuration? [Y/N]
Press Y to confirm
OK-Deleted launch configuration
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