Red Hat OpenShift

Configuration for ACK controllers in an OpenShift cluster.

Pre-installation instructions#

When ACK service controllers are installed via OperatorHub, a cluster administrator will need to perform the following pre-installation steps to provide the controller any credentials and authentication context it needs to interact with the AWS API.

Configuration and authentication in OpenShift requires the use of IAM users and policies. Authentication credentials are set inside a Secret (optional if utilizing IRSA) before installation of the controller.

Step 1: Create the installation namespace#

If the default ack-system namespace does not exist already, create it:

oc new-project ack-system 

Step 2: Bind an AWS IAM principal to a service user account#

Create a user with the aws CLI (named ack-elasticache-service-controller in our example):

aws iam create-user --user-name ack-elasticache-service-controller 

Enable programmatic access for the user you just created:

aws iam create-access-key --user-name ack-elasticache-service-controller 

You should see output with important credentials:

{ "AccessKey": { "UserName": "ack-elasticache-service-controller", "AccessKeyId": "00000000000000000000", "Status": "Active", "SecretAccessKey": "abcdefghIJKLMNOPQRSTUVWXYZabcefghijklMNO", "CreateDate": "2021-09-30T19:54:38+00:00" } } 

Save or note AccessKeyId and SecretAccessKey for later use.

Each service controller repository provides a recommended policy ARN for use with the controller. For an example, see the recommended policy for Elasticache here.

Attach the recommended policy to the user we created in the previous step:

aws iam attach-user-policy \ --user-name ack-elasticache-service-controller \ --policy-arn 'arn:aws:iam::aws:policy/AmazonElastiCacheFullAccess' 

Step 3: Create ack-$SERVICE-user-config and ack-$SERVICE-user-secrets for authentication#

Enter the ack-system namespace. Create a file, config.txt, with the following variables, leaving ACK_WATCH_NAMESPACE blank so the controller can properly watch all namespaces, and change any other values to suit your needs:

ACK_ENABLE_DEVELOPMENT_LOGGING=true ACK_LOG_LEVEL=debug ACK_WATCH_NAMESPACE= AWS_REGION=us-west-2 AWS_ENDPOINT_URL= ACK_RESOURCE_TAGS=hellofromocp ENABLE_LEADER_ELECTION=true LEADER_ELECTION_NAMESPACE= RECONCILE_DEFAULT_MAX_CONCURRENT_SYNCS=1 FEATURE_FLAGS= FEATURE_GATES= 

Now use config.txt to create a ConfigMap in your OpenShift cluster:

export SERVICE=elasticache oc create configmap \ --namespace ack-system \ --from-env-file=config.txt ack-$SERVICE-user-config 

Save another file, secrets.txt, with the following authentication values, which you should have saved from earlier when you created your user’s access keys:

AWS_ACCESS_KEY_ID=00000000000000000000 AWS_SECRET_ACCESS_KEY=abcdefghIJKLMNOPQRSTUVWXYZabcefghijklMNO 

Use secrets.txt to create a Secret in your OpenShift cluster:

oc create secret generic \ --namespace ack-system \ --from-env-file=secrets.txt ack-$SERVICE-user-secrets 

Delete config.txt and secrets.txt.

Step 4 (Optional): Apply Additional Custom Resource Definitions(CRD)#

To prevent CRD installation conflicts for CRDs shared across multiple AWS Controllers for Kubernetes, the AdoptedResource and FieldExport CRDs are not included in the OpenShift Embedded OperatorHub. These must be installed manually by a cluster administrator before any controller is installed by running the following commands:

Apply the AdoptedResource CRD

oc apply -f https://raw.githubusercontent.com/aws-controllers-k8s/runtime/main/config/crd/bases/services.k8s.aws_adoptedresources.yaml 

Apply the FieldExport CRD

oc apply -f https://raw.githubusercontent.com/aws-controllers-k8s/runtime/main/config/crd/bases/services.k8s.aws_fieldexports.yaml 

Step 5: Install the controller#

Follow the instructions for installing the controller using OperatorHub.

Additional uninstallation steps#

Perform the following cleanup steps in addition to the steps in Uninstall an ACK Controller.

Uninstall the ACK Controller#

Navigate in the OpenShift dashboard to the OperatorHub page and search for the controller name. Select Uninstall to remove the controller.

Delete ConfigMap#

Delete the following ConfigMap you created in pre-installation:

oc delete configmap ack-$SERVICE-user-config 

Delete user Secret#

Delete the folllowing Secret you created in pre-installation:

oc delete secret ack-$SERVICE-user-secrets 

Next Steps#

After you install the controller, you can follow the Cross Account Resource Management instructions to manage resources in multiple AWS accounts.

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