terraform 中的任务执行 IAM 角色

Question

我正在为任务执行创建一个 IAM 角色。我已经在 cloudformation 中完成了，现在我在 terraform 中进行，但我遇到的问题是在 cloudformation 中有一个属性可以提供ManagedPolicyArns，但是你将如何在 terraform 中提供它。我附上了两个脚本。 Terraform 脚本不完整，我需要帮助，而 cloudformation 脚本已完成，我想将其复制到 terraform。

地形：

resource "aws_iam_role" "task_execution" {
  name               = "task-execution-${terraform.workspace}"
  assume_role_policy = <<EOF
{
    "Version": "2012-10-17",
    "Statement": [
        {
        "Action": "sts:AssumeRole",
        "Principal": {
            "Service": "ecs-tasks.amazonaws.com"
        },
        "Effect": "Allow",
        "Sid": "",
        "path": "/",
        }
  ]
}
EOF

  tags = {
    tag-key = "tag-value"
  }
}

云形成

---
AWSTemplateFormatVersion: 2010-09-09 
Parameters:
  Env:
    Type: String
Resources:
  ExRole:
      Type: 'AWS::IAM::Role'
      Properties:
        AssumeRolePolicyDocument:
          Version: '2012-10-17'
          Statement:
            - Effect: Allow
              Principal:
                Service:
                  - ecs-tasks.amazonaws.com
              Action:
                - 'sts:AssumeRole'
        Path: /
        RoleName: !Sub "excutionrole-${Env}"
        ManagedPolicyArns:
          - arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy
        Policies: 
          - PolicyName: AccessECR
            PolicyDocument:
              Version: '2012-10-17'
              Statement:
                - Effect: Allow
                  Action: 
                    - ecr:BatchGetImage
                    - ecr:GetAuthorizationToken
                    - ecr:GetDownloadUrlForLayer 
                  Resource: '*'

Answer 1

在 Terraform 中，您可以使用 iam_role_policy_attachment 资源将策略附加到角色：

resource "aws_iam_role_policy_attachment" "test-attach" {
    role       = aws_iam_role.test_role.name
    policy_arn = // ARN of the managed policy
}

Answer 2

assume_role_policy 仅用于 信任关系（即谁/什么可以担任该角色）。因此， 你的aws_iam_role 应该是：

resource "aws_iam_role" "test_role" {
  name = "s3_access"

  assume_role_policy = <<EOF
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "1",
            "Effect": "Allow",
            "Principal": {
              "Service": "ecs-tasks.amazonaws.com"
              },
            "Action": "sts:AssumeRole"            
        }
    ]
}
EOF

  tags = {
    tag-key = "tag-value"
  }
}

然后，可以将所需的权限附加到角色，如下所示：

resource "aws_iam_role_policy_attachment" "ecs-task-permissions" {
    role       = aws_iam_role.test_role.name
    policy_arn = "arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy"
}


resource "aws_iam_role_policy" "ecr-access" {

  name = "ecs-access"
  
  role = aws_iam_role.test_role.name

  policy = <<EOF
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "2",
            "Effect": "Allow",
            "Action": [
                "ecr:BatchGetImage",
                "ecr:GetAuthorizationToken",
                "ecr:GetDownloadUrlForLayer"
            ],
            "Resource": "*"
        }
    ]
}
EOF

}