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Deploy EC2 instance with durable directory

Overview

This code shows the deployment of an EC2 instance that, even after experiencing an outage in its Availability Zone, persists data in one directory in EFS (which protects against outages of single AZs). The EC2 instance itself is part of an autoscaling group that ensures that it is restarted after an outage.

Note: EFS is mounted at /efs and it might take several minutes after the EC2 instance startup until the EFS mount target can be resolved by its DNS name and mounted thereafter.

Architecture

Test Failover

  1. Deploy infrastructure

    terraform init
terraform apply

  2. Connect to EC2 instance and put some data under /efs.

  3. Get ID of EC2 instance

    aws autoscaling describe-auto-scaling-instances

  4. Terminate instance

    aws autoscaling terminate-instance-in-auto-scaling-group --instance-id <instance id> --no-should-decrement-desired-capacity

  5. Wait for replacement of EC2 instance.

  6. Connect to new EC2 instance (will use the same IP address) and check /efs.