Chapter 3. Air-gapped environment

Procedure

1. Log in to the OCP using oc:

   oc login -u <user> -p <password> https://api.<HOSTNAME>:6443

2. Log in to the OCP image registry using podman:

   podman login -u kubeadmin -p $(oc whoami -t) default-route-openshift-image-registry.<HOSTNAME>

   Note

   You can use the following commands to get the full host name of the OpenShift image registry and than use the host name in a command to log in:

   REGISTRY_HOST=$(oc get route default-route -n openshift-image-registry --template='{{ .spec.host }}')
   
   podman login -u kubeadmin -p $(oc whoami -t) $REGISTRY_HOST

3. Log in to the registry.redhat.io in podman using the following command:

   podman login registry.redhat.io

   For more information about registry authentication, see Red Hat Container Registry Authentication.

4. Pull Developer Hub and PostgreSQL images from Red Hat Image registry to your workstation:

   podman pull <DEVELOPERHUBIMAGE>
   podman pull registry.redhat.io/rhel9/postgresql-15:latest

5. Push both images to the internal OCP registry.

   For more information about pushing images directly to OCP registry, see How do I push an Image directly into the OpenShift 4 registry.

   podman push --remove-signatures registry.redhat.io/rhel9/postgresql-15:latest default-route-openshift-image-registry.<hostname>/<yourProject>/postgresql-15:latest

   Tip

   If an x509 error occurs, ensure you install the CA certificate used for OpenShift routes on your system.

   Optionally, you can append --tls-verify=false to the podman push command, note that this approach is not recommended.

6. Use the following command to verify that both images are present in the internal OCP registry:

   oc get imagestream -n <projectName>

7. Enable local image lookup for both images using the following commands:

   oc set image-lookup postgresql-15
   oc set image-lookup  rhdh-hub-rhel9

8. Go to YAML view and update the image section for backstage and postgresql using the following values:

   Example values for Developer Hub image

   upstream:
     backstage:
       image:
         registry: ""
         repository: rhdh-hub-rhel9
         tag: latest

   Example values for PostgreSQL image

   upstream:
     postgresql:
       image:
         registry: ""
         repository: postgresql-15
         tag: latest

9. Install the Red Hat Developer Hub using Helm Chart. For more information about installing Developer Hub, see Chapter 2, Installing Red Hat Developer Hub using Helm Chart.