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Chapter 3. Air-gapped environment

An air-gapped environment, also known as an air-gapped network or isolated network, ensures security by physically segregating the system or network. This isolation is established to prevent unauthorized access, data transfer, or communication between the air-gapped system and external sources.

You can install the Red Hat Developer Hub in an air-gapped environment to ensure security and meet specific regulatory requirements.

To install the Developer Hub in an air-gapped environment, you must have access to the registry.redhat.io and the registry for the air-gapped environment.

Prerequisites

  • You have installed an Openshift Container Platform (OCP) 4.10 or later.
  • You have access to the registry.redhat.io.
  • You have access to the OpenShift image registry of your cluster. For more information about exposing the OpenShift image registry, see Exposing the registry in OpenShift documentation.
  • You have installed the oc command line tool on your workstation.
  • You have installed the podman command line tools on your workstation.
  • You you have an account in Red Hat Developer portal.

Procedure

  1. Log in to the OCP using oc: 

    oc login -u <user> -p <password> https://api.<HOSTNAME>:6443
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  2. Log in to the OCP image registry using podman: 

    podman login -u kubeadmin -p $(oc whoami -t) default-route-openshift-image-registry.<HOSTNAME>
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    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
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  3. Log in to the registry.redhat.io in podman using the following command: 

    podman login registry.redhat.io
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    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
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  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
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    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>
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  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
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  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
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    Example values for PostgreSQL image

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