Question

我有一个用Python 2.7编写的Lambda函数（rsops），它通过调用boto3的'create_cluster（）'方法来创建Redshift集群：

def spinup_cluster(CID, RSU, RSP, RSDB, RSSG, RSAZ, RSPG):
    RSC = boto3.client('redshift', region_name=RSAZ[:-1])

    return RSC.create_cluster(
        DBName=RSDB,
        ClusterIdentifier=CID,
        ClusterType='multi-node',
        NodeType='ds2.xlarge',
        MasterUsername=RSU,
        MasterUserPassword=RSP,
        VpcSecurityGroupIds=[RSSG],
        ClusterSubnetGroupName='data',
        AvailabilityZone=RSAZ,
        PreferredMaintenanceWindow='sun:03:00-sun:03:30',
        ClusterParameterGroupName=RSPG,
        AutomatedSnapshotRetentionPeriod=1,
        Port=5439,
        ClusterVersion='1.0',
        AllowVersionUpgrade=True,
        NumberOfNodes=2,
        PubliclyAccessible=True,
        Tags=[
            {
                'Key': 'product',
                'Value': 'data'
            },
        ],
        Encrypted=False)

分配给此Lambda函数的IAM角色具有对Redshift的完全访问权限（出于测试目的）：

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "LambdaInvokeLambda",
            "Effect": "Allow",
            "Action": [
                "lambda:InvokeFunction"
            ],
            "Resource": [
                "arn:aws:lambda:us-east-1:012345678901:function:spinuprs*",
                "arn:aws:lambda:us-east-1:012345678901:function:rsops*"
            ]
        },
        {
            "Sid": "PassRoleOverToUser",
            "Effect": "Allow",
            "Action": [
                "iam:GetRole",
                "iam:PassRole"
            ],
            "Resource": [
                "arn:aws:lambda:us-east-1:012345678901:function:rsops*",
                "arn:aws:redshift:us-east-1:012345678901:cluster:*",
                "arn:aws:redshift:us-west-2:012345678901:cluster:*"
            ]
        },
        {
            "Sid": "RSAccess",
            "Action": "redshift:*",
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}

信任策略将EC2，Lambda和Redshift授予“ AssumeRole”权限：

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": [
          "ec2.amazonaws.com",
          "redshift.amazonaws.com",
          "lambda.amazonaws.com"
        ]
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

但是我不断收到“访问拒绝”错误，提示我没有烫发“ CreateCluster”呼叫的机会：

Spin up testcluster (us-east-1, 1-node) ...
Traceback (most recent call last):
  File "./rsops.py", line 163, in <module>
    resp=spinup_cluster(cid, rsu, rsp, rsdb, rssg, rsaz, rspg)
  File "./rsops.py", line 87, in spinup_cluster
    Encrypted=False)
  File "/usr/local/lib/python2.7/site-packages/botocore/client.py", line 320, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/usr/local/lib/python2.7/site-packages/botocore/client.py", line 624, in _make_api_call
    raise error_class(parsed_response, operation_name)
botocore.errorfactory.UnauthorizedOperation: An error occurred (UnauthorizedOperation) when calling the CreateCluster operation: Access Denied. Please ensure that your IAM Permissions allow this operation.

我能够毫无问题地调用delete_cluster（）和describe_clusters（），我还从boto3 STS API中调用了“ get_caller_identity（）”，以验证其是否使用了正确的IAM角色。

我正在Lambda函数中运行，该Lambda函数可通过NAT实例访问Internet，但是私有子网应该不成问题，因为我正在其中运行其他Lambda函数。我在同一子网中具有以下环境的实例中启动了一个实例，并附加了相同的IAM角色，但仍然出现相同的错误：

AMI: amzn-ami-hvm-2018.03.0.20181129-x86_64-gp2
Python version: 2.7.14
boto3 version: 1.9.64

如果需要更多详细信息，请告诉我。我已经尝试调试了一个星期，但是我无法弄清楚，任何帮助将不胜感激！

Answer 1

刚从附近的一个AWS阁楼回来，那里的一个好人帮我弄清楚了我的IAM中需要一堆'ec2：Describe *'权限：

ec2:DescribeAccountAttributes
ec2:DescribeAddresses
ec2:DescribeAvailabilityZones
ec2:DescribeSecurityGroups
ec2:DescribeSubnets
ec2:DescribeVpcs
ec2:DescribeInternetGateways

我想Lambda需要它们检查您在'create_cluster'调用中指定的VPC /子网/安全组是否确实存在。实际上，我为角色修改了内置的“ AmazonRedshiftFullAccess”策略以缩小权限。

即使IAM角色具有完全Redshift权限，调用Redshift'CreateCluster'操作时，AWS Lambda也会出现“访问被拒绝”错误

1 个答案: