cloud-config w/ script

cloud-config.yml

#cloud-config
write_files:
  - path: /etc/rc.local
    permissions: "0755"
    owner: root
    content: |
      #!/bin/bash
      echo "I'm doing things on start"
      touch /tmp/i-did-something

rancher:
  services:
    # Just an example of running a container on that host, or you can do 'docker run ...' in the script above
    nginx:
      image: nginx
      
  environment:
    ECS_CLUSTER: your-ecs-cluster-name
  
  # If you have selected a RancherOS AMI that does not have ECS enabled by default,
  # you'll need to enable the system-service for the ECS agent.
  services_include:
    amazon-ecs-agent: true