Chapter 10. Updating a cluster in a disconnected environment

Procedure

1. Use the Red Hat OpenShift Container Platform Upgrade Graph visualizer and update planner to plan an update from one version to another. The OpenShift Upgrade Graph provides channel graphs and a way to confirm that there is an update path between your current and intended cluster versions.

2. Set the required environment variables:

   1. Export the release version:

      $ export OCP_RELEASE=<release_version>

      For <release_version>, specify the tag that corresponds to the version of OpenShift Container Platform to which you want to update, such as 4.5.4.

   2. Export the local registry name and host port:

      $ LOCAL_REGISTRY='<local_registry_host_name>:<local_registry_host_port>'

      For <local_registry_host_name>, specify the registry domain name for your mirror repository, and for <local_registry_host_port>, specify the port that it serves content on.

   3. Export the local repository name:

      $ LOCAL_REPOSITORY='<local_repository_name>'

      For <local_repository_name>, specify the name of the repository to create in your registry, such as ocp4/openshift4.

   4. If you are using the OpenShift Update Service, export an additional local repository name to contain the release images:

      $ LOCAL_RELEASE_IMAGES_REPOSITORY='<local_release_images_repository_name>'

      For <local_release_images_repository_name>, specify the name of the repository to create in your registry, such as ocp4/openshift4-release-images.

   5. Export the name of the repository to mirror:

      $ PRODUCT_REPO='openshift-release-dev'

      For a production release, you must specify openshift-release-dev.

   6. Export the path to your registry pull secret:

      $ LOCAL_SECRET_JSON='<path_to_pull_secret>'

      For <path_to_pull_secret>, specify the absolute path to and file name of the pull secret for your mirror registry that you created.

      Note

      If your cluster uses an ImageContentSourcePolicy object to configure repository mirroring, you can use only global pull secrets for mirrored registries. You cannot add a pull secret to a project.

   7. Export the release mirror:

      $ RELEASE_NAME="ocp-release"

      For a production release, you must specify ocp-release.

   8. Export the type of architecture for your server, such as x86_64.:

      $ ARCHITECTURE=<server_architecture>

   9. Export the path to the directory to host the mirrored images:

      $ REMOVABLE_MEDIA_PATH=<path> 1

      1

      Specify the full path, including the initial forward slash (/) character.

3. Review the images and configuration manifests to mirror:

   $ oc adm release mirror -a ${LOCAL_SECRET_JSON} --to-dir=${REMOVABLE_MEDIA_PATH}/mirror quay.io/${PRODUCT_REPO}/${RELEASE_NAME}:${OCP_RELEASE}-${ARCHITECTURE} --dry-run

4. Mirror the version images to the mirror registry.

   • If your mirror host does not have internet access, take the following actions:

     1. Connect the removable media to a system that is connected to the internet.

     2. Mirror the images and configuration manifests to a directory on the removable media:

        $ oc adm release mirror -a ${LOCAL_SECRET_JSON} --to-dir=${REMOVABLE_MEDIA_PATH}/mirror quay.io/${PRODUCT_REPO}/${RELEASE_NAME}:${OCP_RELEASE}-${ARCHITECTURE}

     3. Take the media to the disconnected environment and upload the images to the local container registry.

        $ oc image mirror  -a ${LOCAL_SECRET_JSON} --from-dir=${REMOVABLE_MEDIA_PATH}/mirror "file://openshift/release:${OCP_RELEASE}*" ${LOCAL_REGISTRY}/${LOCAL_REPOSITORY} 1

        1

        For REMOVABLE_MEDIA_PATH, you must use the same path that you specified when you mirrored the images.

     4. Use oc command-line interface (CLI) to log in to the cluster that you are upgrading.

     5. Apply the mirrored release image signature config map to the connected cluster:

        $ oc apply -f ${REMOVABLE_MEDIA_PATH}/mirror/config/<image_signature_file> 1

        1

        For <image_signature_file>, specify the path and name of the file, for example, signature-sha256-81154f5c03294534.yaml.

     6. If you are using the OpenShift Update Service, mirror the release image to a separate repository:

        $ oc image mirror -a ${LOCAL_SECRET_JSON} ${LOCAL_REGISTRY}/${LOCAL_REPOSITORY}:${OCP_RELEASE}-${ARCHITECTURE} ${LOCAL_REGISTRY}/${LOCAL_RELEASE_IMAGES_REPOSITORY}:${OCP_RELEASE}-${ARCHITECTURE}

   • If the local container registry and the cluster are connected to the mirror host, take the following actions:

     1. Directly push the release images to the local registry and apply the config map to the cluster by using following command:

        $ oc adm release mirror -a ${LOCAL_SECRET_JSON} --from=quay.io/${PRODUCT_REPO}/${RELEASE_NAME}:${OCP_RELEASE}-${ARCHITECTURE} \
          --to=${LOCAL_REGISTRY}/${LOCAL_REPOSITORY} --apply-release-image-signature

        Note

        If you include the --apply-release-image-signature option, do not create the config map for image signature verification.

     2. If you are using the OpenShift Update Service, mirror the release image to a separate repository:

        $ oc image mirror -a ${LOCAL_SECRET_JSON} ${LOCAL_REGISTRY}/${LOCAL_REPOSITORY}:${OCP_RELEASE}-${ARCHITECTURE} ${LOCAL_REGISTRY}/${LOCAL_RELEASE_IMAGES_REPOSITORY}:${OCP_RELEASE}-${ARCHITECTURE}

Procedure

1. Optional: To append a new pull secret to the existing pull secret, complete the following steps:

   1. Enter the following command to download the pull secret:

      $ oc get secret/pull-secret -n openshift-config --template='{{index .data ".dockerconfigjson" | base64decode}}' ><pull_secret_location> 1

      1

      Provide the path to the pull secret file.

   2. Enter the following command to add the new pull secret:

      $ oc registry login --registry="<registry>" \ 1
      --auth-basic="<username>:<password>" \ 2
      --to=<pull_secret_location> 3

      1

      Provide the new registry. You can include multiple repositories within the same registry, for example: --registry="<registry/my-namespace/my-repository>".

      2

      Provide the credentials of the new registry.

      3

      Provide the path to the pull secret file.

      Alternatively, you can perform a manual update to the pull secret file.

2. Enter the following command to update the global pull secret for your cluster:

   $ oc set data secret/pull-secret -n openshift-config --from-file=.dockerconfigjson=<pull_secret_location> 1

   1

   Provide the path to the new pull secret file.

   This update is rolled out to all nodes, which can take some time depending on the size of your cluster.

   Note

   As of OpenShift Container Platform 4.7.4, changes to the global pull secret no longer trigger a node drain or reboot.

Procedure

1. Create a Dockerfile, for example, ./Dockerfile, containing the following:

   FROM registry.access.redhat.com/ubi8/ubi:8.1
   
   RUN curl -L -o cincinnati-graph-data.tar.gz https://api.openshift.com/api/upgrades_info/graph-data
   
   RUN mkdir -p /var/lib/cincinnati-graph-data && tar xvzf cincinnati-graph-data.tar.gz -C /var/lib/cincinnati-graph-data/ --no-overwrite-dir --no-same-owner
   
   CMD ["/bin/bash", "-c" ,"exec cp -rp /var/lib/cincinnati-graph-data/* /var/lib/cincinnati/graph-data"]

2. Use the docker file created in the above step to build a graph-data container image, for example, registry.example.com/openshift/graph-data:latest:

   $ podman build -f ./Dockerfile -t registry.example.com/openshift/graph-data:latest

3. Push the graph-data container image created in the previous step to a repository that is accessible to the OpenShift Update Service, for example, registry.example.com/openshift/graph-data:latest:

   $ podman push registry.example.com/openshift/graph-data:latest

   Note

   To push a graph data image to a local registry in a disconnected environment, copy the graph-data container image created in the previous step to a repository that is accessible to the OpenShift Update Service. Run oc image mirror --help for available options.

Procedure

1. To list all the available MachineHealthCheck resources that you want to pause, run the following command:

   $ oc get machinehealthcheck -n openshift-machine-api

2. To pause the machine health checks, add the cluster.x-k8s.io/paused="" annotation to the MachineHealthCheck resource. Run the following command:

   $ oc -n openshift-machine-api annotate mhc <mhc-name> cluster.x-k8s.io/paused=""

   The annotated MachineHealthCheck resource resembles the following YAML file:

   apiVersion: machine.openshift.io/v1beta1
   kind: MachineHealthCheck
   metadata:
     name: example
     namespace: openshift-machine-api
     annotations:
       cluster.x-k8s.io/paused: ""
   spec:
     selector:
       matchLabels:
         role: worker
     unhealthyConditions:
     - type:    "Ready"
       status:  "Unknown"
       timeout: "300s"
     - type:    "Ready"
       status:  "False"
       timeout: "300s"
     maxUnhealthy: "40%"
   status:
     currentHealthy: 5
     expectedMachines: 5

   Important

   Resume the machine health checks after updating the cluster. To resume the check, remove the pause annotation from the MachineHealthCheck resource by running the following command:

   $ oc -n openshift-machine-api annotate mhc <mhc-name> cluster.x-k8s.io/paused-

Procedure

1. Configure mirrored repositories, by either:

   • Setting up a mirrored repository with Red Hat Quay, as described in Red Hat Quay Repository Mirroring. Using Red Hat Quay allows you to copy images from one repository to another and also automatically sync those repositories repeatedly over time.

   • Using a tool such as skopeo to copy images manually from the source directory to the mirrored repository.

     For example, after installing the skopeo RPM package on a Red Hat Enterprise Linux (RHEL) 7 or RHEL 8 system, use the skopeo command as shown in this example:

     $ skopeo copy \
     docker://registry.access.redhat.com/ubi8/ubi-minimal@sha256:5cfbaf45ca96806917830c183e9f37df2e913b187adb32e89fd83fa455ebaa6 \
     docker://example.io/example/ubi-minimal

     In this example, you have a container image registry that is named example.io with an image repository named example to which you want to copy the ubi8/ubi-minimal image from registry.access.redhat.com. After you create the registry, you can configure your OpenShift Container Platform cluster to redirect requests made of the source repository to the mirrored repository.

2. Log in to your OpenShift Container Platform cluster.

3. Create an ImageContentSourcePolicy file (for example, registryrepomirror.yaml), replacing the source and mirrors with your own registry and repository pairs and images:

   apiVersion: operator.openshift.io/v1alpha1
   kind: ImageContentSourcePolicy
   metadata:
     name: ubi8repo
   spec:
     repositoryDigestMirrors:
     - mirrors:
       - example.io/example/ubi-minimal 1
       - example.com/example/ubi-minimal 2
       source: registry.access.redhat.com/ubi8/ubi-minimal 3
     - mirrors:
       - mirror.example.com/redhat
       source: registry.redhat.io/openshift4 4
     - mirrors:
       - mirror.example.com
       source: registry.redhat.io 5
     - mirrors:
       - mirror.example.net/image
       source: registry.example.com/example/myimage 6
     - mirrors:
       - mirror.example.net
       source: registry.example.com/example 7
     - mirrors:
       - mirror.example.net/registry-example-com
       source: registry.example.com 8

   1

   Indicates the name of the image registry and repository.

   2

   Indicates multiple mirror repositories for each target repository. If one mirror is down, the target repository can use another mirror.

   3

   Indicates the registry and repository containing the content that is mirrored.

   4

   You can configure a namespace inside a registry to use any image in that namespace. If you use a registry domain as a source, the ImageContentSourcePolicy resource is applied to all repositories from the registry.

   5

   If you configure the registry name, the ImageContentSourcePolicy resource is applied to all repositories from a source registry to a mirror registry.

   6

   Pulls the image mirror.example.net/image@sha256:…​.

   7

   Pulls the image myimage in the source registry namespace from the mirror mirror.example.net/myimage@sha256:…​.

   8

   Pulls the image registry.example.com/example/myimage from the mirror registry mirror.example.net/registry-example-com/example/myimage@sha256:…​. The ImageContentSourcePolicy resource is applied to all repositories from a source registry to a mirror registry mirror.example.net/registry-example-com.

4. Create the new ImageContentSourcePolicy object:

   $ oc create -f registryrepomirror.yaml

   After the ImageContentSourcePolicy object is created, the new settings are deployed to each node and the cluster starts using the mirrored repository for requests to the source repository.

5. To check that the mirrored configuration settings, are applied, do the following on one of the nodes.

   1. List your nodes:

      $ oc get node

      Example output

      NAME                           STATUS                     ROLES    AGE  VERSION
      ip-10-0-137-44.ec2.internal    Ready                      worker   7m   v1.24.0
      ip-10-0-138-148.ec2.internal   Ready                      master   11m  v1.24.0
      ip-10-0-139-122.ec2.internal   Ready                      master   11m  v1.24.0
      ip-10-0-147-35.ec2.internal    Ready                      worker   7m   v1.24.0
      ip-10-0-153-12.ec2.internal    Ready                      worker   7m   v1.24.0
      ip-10-0-154-10.ec2.internal    Ready                      master   11m  v1.24.0

      The Imagecontentsourcepolicy resource does not restart the nodes.

   2. Start the debugging process to access the node:

      $ oc debug node/ip-10-0-147-35.ec2.internal

      Example output

      Starting pod/ip-10-0-147-35ec2internal-debug ...
      To use host binaries, run `chroot /host`

   3. Change your root directory to /host:

      sh-4.2# chroot /host

   4. Check the /etc/containers/registries.conf file to make sure the changes were made:

      sh-4.2# cat /etc/containers/registries.conf

      Example output

      unqualified-search-registries = ["registry.access.redhat.com", "docker.io"]
      short-name-mode = ""
      
      [[registry]]
        prefix = ""
        location = "registry.access.redhat.com/ubi8/ubi-minimal"
        mirror-by-digest-only = true
      
        [[registry.mirror]]
          location = "example.io/example/ubi-minimal"
      
        [[registry.mirror]]
          location = "example.com/example/ubi-minimal"
      
      [[registry]]
        prefix = ""
        location = "registry.example.com"
        mirror-by-digest-only = true
      
        [[registry.mirror]]
          location = "mirror.example.net/registry-example-com"
      
      [[registry]]
        prefix = ""
        location = "registry.example.com/example"
        mirror-by-digest-only = true
      
        [[registry.mirror]]
          location = "mirror.example.net"
      
      [[registry]]
        prefix = ""
        location = "registry.example.com/example/myimage"
        mirror-by-digest-only = true
      
        [[registry.mirror]]
          location = "mirror.example.net/image"
      
      [[registry]]
        prefix = ""
        location = "registry.redhat.io"
        mirror-by-digest-only = true
      
        [[registry.mirror]]
          location = "mirror.example.com"
      
      [[registry]]
        prefix = ""
        location = "registry.redhat.io/openshift4"
        mirror-by-digest-only = true
      
        [[registry.mirror]]
          location = "mirror.example.com/redhat"

   5. Pull an image digest to the node from the source and check if it is resolved by the mirror. ImageContentSourcePolicy objects support image digests only, not image tags.

      sh-4.2# podman pull --log-level=debug registry.access.redhat.com/ubi8/ubi-minimal@sha256:5cfbaf45ca96806917830c183e9f37df2e913b187adb32e89fd83fa455ebaa6

Procedure

1. Run the following command, specifying values for <local_registry>, <pull_spec>, and <pull_secret_file>:

   $ oc adm catalog mirror <local_registry>/<pull_spec> <local_registry> -a <pull_secret_file> --icsp-scope=registry

   where:

   <local_registry>

   is the local registry you have configured for your disconnected cluster, for example, local.registry:5000.

   <pull_spec>

   is the pull specification as configured in your disconnected registry, for example, redhat/redhat-operator-index:v4.9

   <pull_secret_file>

   is the registry.redhat.io pull secret in .json file format. You can download the pull secret from the Red Hat OpenShift Cluster Manager.

   The oc adm catalog mirror command creates a /redhat-operator-index-manifests directory and generates imageContentSourcePolicy.yaml, catalogSource.yaml, and mapping.txt files.

2. Apply the new ImageContentSourcePolicy resource to the cluster:

   $ oc apply -f imageContentSourcePolicy.yaml