services.x-iam

This section is the entrypoint to further extension of IAM definition for the IAM roles created throughout.

PermissionsBoundary

This key represents an IAM policy (name or ARN) that needs to be added to the IAM roles in order to represent the IAM Permissions Boundary.

Note

You can either provide a full policy arn, or just the name of your policy. The validation regexp is: 

r"((^([a-zA-Z0-9-_.\/]+)$)|(^(arn:aws:iam::(aws|[0-9]{12}):policy\/)[a-zA-Z0-9-_.\/]+$))"

Examples: 

services:
  serviceA:
    image: nginx
    x-iam:
      PermissionsBoundary: containers
  serviceB:
    image: redis
    x-iam:
      PermissionsBoundary: arn:aws:iam::aws:policy/PowerUserAccess

Tip

if you specify ony the name, ie. containers , this will resolve into arn:${AWS::Partition}:iam::${AWS::AccountId}:policy/containers

Policies

Allows you to define additional IAM policies. Follows the same pattern as CFN IAM Policies 

x-iam:
  Policies:
      - PolicyName: somenewpolicy
        PolicyDocument:
          Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action:
                - ec2:Describe*
              Resource:
                - "*"
              Sid: "AllowDescribeAll"

Tip

If you used the ECS Plugin from docker before, this is equivalent to x-aws-role

ManagedPolicies

Allows you to add additional managed policies. You can specify the full ARN or just a string for the name / path of the policy. If will resolve into the same regexp as for PermissionsBoundary

Tip

If you used the ECS Plugin from docker before, this is equivalent to x-aws-policies

Hint

You can also use the Docker ECS-Plugin x-aws-iam extension fields with ECS ComposeX

ManagedPolicies example 
services:
  serviceA:
    x-iam:
      ManagedPolicies:
        - arn:aws:iam::aws:policy/Administrator # AWS Managed Policy
        - developer                             # User Managed Policy