CODEWITHSUNDEEP
amazon-web-servicesaws-cloudformation
shantanuo
shantanuo

Reputation: 32296

Create IAM role and attach a custom policy

I am trying to create a new IAM role with the following policy using cloudformation template. Need to replace CW_NAMESPACE and LOG_GROUP_ARN with actual values.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "cloudwatch:PutMetricData",
      "Resource": "*",
      "Condition": {
        "StringEquals": {
          "cloudwatch:namespace": "CW_NAMESPACE"
        }
      }
    },
    {
      "Effect": "Allow",
      "Action": [
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents",
        "logs:DescribeLogStreams",
        "logs:DescribeLogGroups"
      ],
      "Resource": "LOG_GROUP_ARN"
    }
  ]
}

Any suggestion about how to automate role creation using a template will be appreciated.

I found this template here...

https://cloudonaut.io/seamless-ec2-monitoring-with-the-unified-cloudwatch-agent/

Upvotes: 0

Views: 729

Answers (1)

John Rotenstein
John Rotenstein

Reputation: 269091

Here are examples of how to create an IAM Role in a CloudFormation Template.

Yaml

Resources:

  LambdaLoadInventoryRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: Lambda-Load-Inventory-Role
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess
        - arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess
      Policies:
        - PolicyName: CWLogsPolicy
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Action:
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource: arn:aws:logs:*:*:*
                Effect: Allow

JSON

"Resources": {
    "CommonResourceRole": {
        "Type": "AWS::IAM::Role",
        "Properties": {
            "AssumeRolePolicyDocument": {
                "Version": "2012-10-17",
                "Statement": [
                    {
                        "Sid": "",
                        "Effect": "Allow",
                        "Principal": {
                            "Service": [
                                "lambda.amazonaws.com"
                            ]
                        },
                        "Action": "sts:AssumeRole"
                    }
                ]
            },
            "Policies": [
                {
                    "PolicyName": "LambdaPolicy",
                    "PolicyDocument": {
                        "Version": "2012-10-17",
                        "Statement": [
                            {
                                "Effect": "Allow",
                                "Action": [
                                    "logs:CreateLogGroup",
                                    "logs:CreateLogStream",
                                    "logs:PutLogEvents"
                                ],
                                "Resource": "arn:aws:logs:*:*:*"
                            },
                            {
                                "Effect": "Allow",
                                "Action": [
                                    "cloudwatch:PutMetricData"
                                ],
                                "Resource": "*",
                                "Condition": {
                                    "StringEquals": {
                                        "cloudwatch:namespace": "CW_NAMESPACE"
                                    }
                                }
                            }
                        ]
                    }
                }
            ]
        }
    }
}

Upvotes: 2

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