Question

以下是EC2实例承担的角色：

"AScaleLaunchConfig": {
            "Type": "AWS::AutoScaling::LaunchConfiguration",
            "Properties":{
                …..
                "IamInstanceProfile": { "Ref": "EC2InstProfl” },
                …..
            }
        }


"EC2InstProfl": {
            "Type": "AWS::IAM::InstanceProfile",
            "Properties":{
                "Path": "/",
                "Roles": [ {  "Ref": "EC2InstRole" } ]
            }
        }


  "EC2InstRole": {
            "Type": "AWS::IAM::Role",
            "Properties": {
                "AssumeRolePolicyDocument": {
                    "Version": "2012-10-17",
                    "Statement": [
                      {
                          "Effect": "Allow",
                          "Principal": { "Service": [ "ec2.amazonaws.com" ] },
                          "Action": [ "sts:AssumeRole" ]
                      }        
                    ]
                },
                "Path": "/",
                "ManagedPolicyArns": [ "arn:aws:iam::aws:policy/service-role/AmazonEC2ContainerServiceforEC2Role" ],
            }
        }

以下是分配给在该EC2实例中运行的任务（码头集装箱）的SomeTaskRole：

"EcsTaskDef": {
            "Type": "AWS::ECS::TaskDefinition",
            "Properties":{
                "NetworkMode": "host",
                "TaskRoleArn": "arn:aws:iam::xxxxxxxxx:role/SomeTaskRole",
                "ContainerDefinitions": [
                    {
                        "Name": “someapp",
                        "Image": “someaccout/someimage:test",

                    }
                ]
            }
        }

其中SomeTaskRole是：

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Description": “Allow access to all EC2/ELB/cloudformation/s3 and aim passrole",    
            …..
            "Resource": "*"
        },
        {
            "Description": “Assume iam User role“,
             ….. 
           "Effect": "Allow"
        },
        {
            "Description": “Assume xyz role across all accouts“,
             …..
            "Effect": "Allow"
        },
        {
            "Description": “Allow * access to all resource across n regions",
              ….
        },
        {
            "Description": “Deny delete permission on network related resources like Subnets/Route/VPC/VPN/IGW etc…*,
              ….
        },
        {
            "Description": “There are many such rules",
              ….
        }

    ]
}

如果将EC2InstRole分配给EC2实例，则Cloudformation堆栈将成功启动。

如果将SomeTaskRole分配给EcsTaskDef ，并且 EC2InstRole分配给EC2实例，则Cloudformation堆栈启动将挂起数小时，并且出错。尚未找到确切的错误。如果删除"TaskRoleArn": "arn:aws:iam::xxxxxxxxx:role/SomeTaskRole"，则CloudFormation堆栈将成功启动。

1）

AWS IAM服务同时允许两者吗？

为ECS任务分配角色

和

要为EC2实例分配角色？

2）

如果是，则EC2角色中指定的规则是否重叠（并覆盖）ECS任务角色中指定的规则？

Answer 1

ECS任务仅获得分配给该任务的角色/权限。它没有主机的权限。

当您看到CloudFormation像这样“挂起”时，很可能是因为任务从未达到稳定状态。解决问题的最简单方法是查看ECS中失败的任务。为此，请打开ECS群集，选择“任务”选项卡并显示“已停止的任务”。打开一个并查看底部的折叠信息。那里经常有一些非常有用的信息。

附加到EC2实例的IAM策略规则是否与附加到EC2内运行的ECS任务的策略规则重叠（＆override）？

1 个答案: