Associating IAM roles with clusters
After you have created an IAM role that authorizes Amazon Redshift to access other AWS services for you, you must associate that role with an Amazon Redshift cluster. You must do this before you can use the role to load or unload data.
Permissions required to associate an IAM role with a cluster
To associate an IAM role with a cluster, a user must have
iam:PassRole
permission for that IAM role. This permission
allows an administrator to restrict which IAM roles a user can associate with
Amazon Redshift clusters. As a best practice, we recommend attaching permissions policies to an IAM role and then assigning it to users and groups as
needed. For more information, see Identity and access management in Amazon Redshift.
The following example shows an IAM policy that can be attached to a user that allows the user to take these actions:
-
Get the details for all Amazon Redshift clusters owned by that user's account.
-
Associate any of three IAM roles with either of two Amazon Redshift clusters.
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": "redshift:DescribeClusters", "Resource": "*" }, { "Effect": "Allow", "Action": [ "redshift:ModifyClusterIamRoles", "redshift:CreateCluster" ], "Resource": [ "arn:aws:redshift:us-east-1:123456789012:cluster:my-redshift-cluster", "arn:aws:redshift:us-east-1:123456789012:cluster:my-second-redshift-cluster" ] }, { "Effect": "Allow", "Action": "iam:PassRole", "Resource": [ "arn:aws:iam::123456789012:role/MyRedshiftRole", "arn:aws:iam::123456789012:role/SecondRedshiftRole", "arn:aws:iam::123456789012:role/ThirdRedshiftRole" ] } ] }
After a user has the appropriate permissions, that user can associate an IAM role with an Amazon Redshift cluster. The IAM role is then ready to use with the COPY or UNLOAD command or other Amazon Redshift commands.
For more information on IAM policies, see Overview of IAM policies in the IAM User Guide.
Managing IAM role association with a cluster
You can associate an IAM role with an Amazon Redshift cluster when you create the cluster. Or you can modify an existing cluster and add or remove one or more IAM role associations.
Be aware of the following:
-
The maximum number of IAM roles that you can associate is subject to a quota.
-
An IAM role can be associated with multiple Amazon Redshift clusters.
-
An IAM role can be associated with an Amazon Redshift cluster only if both the IAM role and the cluster are owned by the same AWS account.
You can manage IAM role associations for a cluster with the console by using the following procedure.
To manage IAM role associations
Sign in to the AWS Management Console and open the Amazon Redshift console at https://console.aws.amazon.com/redshiftv2/
. -
On the navigation menu, choose Clusters, then choose the cluster that you want to update.
-
For Actions, choose Manage IAM roles to display the current list IAM roles associated with the cluster.
-
On the Manage IAM roles page, choose the available IAM roles to add, and then choose Add IAM role.
-
Choose Done to save your changes.
You can manage IAM role associations for a cluster with the AWS CLI by using the following approaches.
To associate an IAM role with a cluster when the cluster is created,
specify the Amazon Resource Name (ARN) of the IAM role for the
--iam-role-arns
parameter of the
create-cluster
command. The maximum number of IAM
roles that you can add when calling the create-cluster
command is subject to a quota.
Associating and disassociating IAM roles with Amazon Redshift clusters is an
asynchronous process. You can get the status of all IAM role cluster
associations by calling the describe-clusters
command.
The following example associates two IAM roles with the newly created
cluster named my-redshift-cluster
.
aws redshift create-cluster \ --cluster-identifier "my-redshift-cluster" \ --node-type "ra3.4xlarge" \ --number-of-nodes 16 \ --iam-role-arns "arn:aws:iam::123456789012:role/RedshiftCopyUnload" \ "arn:aws:iam::123456789012:role/SecondRedshiftRole"
To associate an IAM role with an existing Amazon Redshift cluster, specify
the Amazon Resource Name (ARN) of the IAM role for the
--add-iam-roles
parameter of the
modify-cluster-iam-roles
command. The maximum number of
IAM roles that you can add when calling the
modify-cluster-iam-roles
command is subject to a quota.
The following example associates an IAM role with an existing cluster
named my-redshift-cluster
.
aws redshift modify-cluster-iam-roles \ --cluster-identifier "my-redshift-cluster" \ --add-iam-roles "arn:aws:iam::123456789012:role/RedshiftCopyUnload"
To disassociate an IAM role from a cluster, specify the ARN of the IAM
role for the --remove-iam-roles
parameter of the
modify-cluster-iam-roles
command.
modify-cluster-iam-roles
The maximum number of IAM
roles that you can remove when calling the
modify-cluster-iam-roles
command is subject to a
quota.
The following example removes the association for an IAM role for the
123456789012
AWS account from a cluster named
my-redshift-cluster
.
aws redshift modify-cluster-iam-roles \ --cluster-identifier "my-redshift-cluster" \ --remove-iam-roles "arn:aws:iam::123456789012:role/RedshiftCopyUnload"
Listing IAM role associations for a cluster using the AWS CLI
To list all of the IAM roles that are associated with an Amazon Redshift
cluster, and the status of the IAM role association, call the
describe-clusters
command. The ARN for each IAM role
associated with the cluster is returned in the IamRoles
list as shown in the following example output.
Roles that have been associated with the cluster show a status of
in-sync
. Roles that are in the process of being
associated with the cluster show a status of adding
. Roles
that are being disassociated from the cluster show a status of
removing
.
{ "Clusters": [ { "ClusterIdentifier": "my-redshift-cluster", "NodeType": "ra3.4xlarge", "NumberOfNodes": 16, "IamRoles": [ { "IamRoleArn": "arn:aws:iam::123456789012:role/MyRedshiftRole", "IamRoleApplyStatus": "in-sync" }, { "IamRoleArn": "arn:aws:iam::123456789012:role/SecondRedshiftRole", "IamRoleApplyStatus": "in-sync" } ], ... }, { "ClusterIdentifier": "my-second-redshift-cluster", "NodeType": "ra3.4xlarge", "NumberOfNodes": 10, "IamRoles": [ { "IamRoleArn": "arn:aws:iam::123456789012:role/MyRedshiftRole", "IamRoleApplyStatus": "in-sync" }, { "IamRoleArn": "arn:aws:iam::123456789012:role/SecondRedshiftRole", "IamRoleApplyStatus": "in-sync" }, { "IamRoleArn": "arn:aws:iam::123456789012:role/ThirdRedshiftRole", "IamRoleApplyStatus": "in-sync" } ], ... } ] }
For more information on using the AWS CLI, see AWS CLI User Guide.