AWS-specific but prior to our migration to ECS containers we used their OpsWorks service. This worked reasonably well - we would setup clusters of servers with

AWS-specific but prior to our migration to ECS containers we used their OpsWorks service. This worked reasonably well - we would setup clusters of servers with specific jobs and autoscaling groups would spin up servers to meet demand using Chef cookbooks to set them up. We used a bash script to handle what we now use GitLab's CI system for. Deployments were handled through CodeDeploy and infrastructure would be replaced in a blue/green fashion.