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AWS Assume Role Steps
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| For example, Account A needs to push docker images to Account B: | |
| High level steps: | |
| * Trust relationship will tell from where the request is originating | |
| * Policy will tell what access the role has | |
| * Account B's role will have trust relationship to Account A | |
| * Account B's role will have access to push the image to ECR | |
| * Account A's role will have trust relationship to EC2(as request is originating from EC2(jenkins)) | |
| * Account A's role will have access to assume Account A's role | |
| On Account B: | |
| * Create a Role in Account B, name it as jenkins-role | |
| * Add Trust Relationship as below to the Role and replace <AccountA_ID> | |
| { | |
| "Version": "2012-10-17", | |
| "Statement": [ | |
| { | |
| "Effect": "Allow", | |
| "Principal": { | |
| "AWS": "arn:aws:iam::<AccountA_ID>:root" | |
| }, | |
| "Action": "sts:AssumeRole", | |
| "Condition": {} | |
| } | |
| ] | |
| } | |
| * Attach policy to the Role in Account B as below | |
| { | |
| "Version": "2012-10-17", | |
| "Statement": [ | |
| { | |
| "Sid": "ECR", | |
| "Effect": "Allow", | |
| "Action": [ | |
| "ecr:*" | |
| ], | |
| "Resource": "*" | |
| } | |
| ] | |
| } | |
| ------------------------------------------------------------- | |
| On Account A: | |
| * Create a Role in Account A | |
| * Add Trust Relationship as below and replace <AccountB_ID> | |
| { | |
| "Version": "2012-10-17", | |
| "Statement": [ | |
| { | |
| "Sid": "", | |
| "Effect": "Allow", | |
| "Principal": { | |
| "Service": "ec2.amazonaws.com" | |
| }, | |
| "Action": "sts:AssumeRole" | |
| } | |
| ] | |
| } | |
| * Attach policy to the role in Account A as below | |
| { | |
| "Version": "2012-10-17", | |
| "Statement": [ | |
| { | |
| "Effect": "Allow", | |
| "Action": "sts:AssumeRole", | |
| "Resource": "arn:aws:iam::<AccountB_ID>:role/jenkins-role" | |
| } | |
| ] | |
| } | |
| * Attach the role to the jenkins ec2 instance |
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