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Authenticating the cert-manager Operator for Red Hat OpenShift with AWS Security Token Service

You can authenticate the cert-manager Operator for Red Hat OpenShift on the AWS Security Token Service (STS) cluster. You can configure cloud credentials for the cert-manager Operator for Red Hat OpenShift by using the ccoctl binary.

Configuring cloud credentials for the cert-manager Operator for Red Hat OpenShift for the AWS Security Token Service cluster

To configure the cloud credentials for the cert-manager Operator for Red Hat OpenShift on the AWS Security Token Service (STS) cluster with the cloud credentials. You must generate the cloud credentials manually, and apply it on the cluster by using the ccoctl binary.

Prerequisites

  • You have extracted and prepared the ccoctl binary.

  • You have configured an OpenShift Container Platform cluster with AWS STS by using the Cloud Credential Operator in manual mode.

Procedure

  1. Create a directory to store a CredentialsRequest resource YAML file by running the following command:

    $ mkdir credentials-request

  2. Create a CredentialsRequest resource YAML file under the credentials-request directory, such as, sample-credential-request.yaml, by applying the following yaml:

    apiVersion: cloudcredential.openshift.io/v1
kind: CredentialsRequest
metadata:
  name: cert-manager
  namespace: openshift-cloud-credential-operator
spec:
  providerSpec:
    apiVersion: cloudcredential.openshift.io/v1
    kind: AWSProviderSpec
    statementEntries:
    - action:
      - "route53:GetChange"
      effect: Allow
      resource: "arn:aws:route53:::change/*"
    - action:
      - "route53:ChangeResourceRecordSets"
      - "route53:ListResourceRecordSets"
      effect: Allow
      resource: "arn:aws:route53:::hostedzone/*"
    - action:
      - "route53:ListHostedZonesByName"
      effect: Allow
      resource: "*"
  secretRef:
    name: aws-creds
    namespace: cert-manager
  serviceAccountNames:
  - cert-manager

  3. Use the ccoctl tool to process CredentialsRequest objects by running the following command:

    $ ccoctl aws create-iam-roles \
    --name <user_defined_name> --region=<aws_region> \
    --credentials-requests-dir=<path_to_credrequests_dir> \
    --identity-provider-arn <oidc_provider_arn> --output-dir=<path_to_output_dir>
    Example output
    2023/05/15 18:10:34 Role arn:aws:iam::XXXXXXXXXXXX:role/<user_defined_name>-cert-manager-aws-creds created
2023/05/15 18:10:34 Saved credentials configuration to: <path_to_output_dir>/manifests/cert-manager-aws-creds-credentials.yaml
2023/05/15 18:10:35 Updated Role policy for Role <user_defined_name>-cert-manager-aws-creds

    Copy the <aws_role_arn> from the output to use in the next step. For example, "arn:aws:iam::XXXXXXXXXXXX:role/<user_defined_name>-cert-manager-aws-creds"

  4. Add the eks.amazonaws.com/role-arn="<aws_role_arn>" annotation to the service account by running the following command:

    $ oc -n cert-manager annotate serviceaccount cert-manager eks.amazonaws.com/role-arn="<aws_role_arn>"

  5. To create a new pod, delete the existing cert-manager controller pod by running the following command:

    $ oc delete pods -l app.kubernetes.io/name=cert-manager -n cert-manager

    The AWS credentials are applied to a new cert-manager controller pod within a minute.

Verification

  1. Get the name of the updated cert-manager controller pod by running the following command:

    $ oc get pods -l app.kubernetes.io/name=cert-manager -n cert-manager
    Example output
    NAME                          READY   STATUS    RESTARTS   AGE
cert-manager-bd7fbb9fc-wvbbt  1/1     Running   0          39s

  2. Verify that AWS credentials are updated by running the following command:

    $ oc set env -n cert-manager po/<cert_manager_controller_pod_name> --list
    Example output
    # pods/cert-manager-57f9555c54-vbcpg, container cert-manager-controller
# POD_NAMESPACE from field path metadata.namespace
AWS_ROLE_ARN=XXXXXXXXXXXX
AWS_WEB_IDENTITY_TOKEN_FILE=/var/run/secrets/eks.amazonaws.com/serviceaccount/token

Additional resources