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Using Red Hat subscriptions in builds

Creating an image stream tag for the Red Hat Universal Base Image

To use Red Hat subscriptions within a build, you create an image stream tag to reference the Universal Base Image (UBI).

To make the UBI available in every project in the cluster, you add the image stream tag to the openshift namespace. Otherwise, to make it available in a specific project, you add the image stream tag to that project.

The benefit of using image stream tags this way is that doing so grants access to the UBI based on the registry.redhat.io credentials in the install pull secret without exposing the pull secret to other users. This is more convenient than requiring each developer to install pull secrets with registry.redhat.io credentials in each project.

Procedure

  • To create an ImageStreamTag in the openshift namespace, so it is available to developers in all projects, enter:

    $ oc tag --source=docker registry.redhat.io/ubi7/ubi:latest ubi:latest -n openshift

  • To create an ImageStreamTag in a single project, enter:

    $ oc tag --source=docker registry.redhat.io/ubi7/ubi:latest ubi:latest

Adding subscription entitlements as a build secret

Builds that use Red Hat subscriptions to install content must include the entitlement keys as a build secret.

Prerequisites

You must have access to Red Hat entitlements through your subscription, and the entitlements must have separate public and private key files.

Procedure

  1. Create a secret containing your entitlements, ensuring that there are separate files containing the public and private keys:

    $  oc create secret generic etc-pki-entitlement --from-file /path/to/entitlement/{ID}.pem \
> --from-file /path/to/entitlement/{ID}-key.pem ...

  2. Add the secret as a build input in the build configuration:

    source:
  secrets:
  - secret:
      name: etc-pki-entitlement
    destinationDir: etc-pki-entitlement

Running builds with Subscription Manager

Docker builds using Subscription Manager

Docker strategy builds can use the Subscription Manager to install subscription content.

Prerequisites

The entitlement keys, subscription manager configuration, and subscription manager certificate authority must be added as build inputs.

Procedure

Use the following as an example Dockerfile to install content with the Subscription Manager:

FROM registry.redhat.io/rhel7:latest
USER root
# Copy entitlements
COPY ./etc-pki-entitlement /etc/pki/entitlement
# Copy subscription manager configurations
COPY ./rhsm-conf /etc/rhsm
COPY ./rhsm-ca /etc/rhsm/ca
# Delete /etc/rhsm-host to use entitlements from the build container
RUN rm /etc/rhsm-host && \
    # Initialize /etc/yum.repos.d/redhat.repo
    # See https://access.redhat.com/solutions/1443553
    yum repolist --disablerepo=* && \
    subscription-manager repos --enable <enabled-repo> && \
    yum -y update && \
    yum -y install <rpms> && \
    # Remove entitlements and Subscription Manager configs
    rm -rf /etc/pki/entitlement && \
    rm -rf /etc/rhsm
# OpenShift requires images to run as non-root by default
USER 1001
ENTRYPOINT ["/bin/bash"]

Running builds with Red Hat Satellite subscriptions

Adding Red Hat Satellite configurations to builds

Builds that use Red Hat Satellite to install content must provide appropriate configurations to obtain content from Satellite repositories.

Prerequisites

  • You must provide or create a yum-compatible repository configuration file that downloads content from your Satellite instance.

    Sample repository configuration
    [test-<name>]
 name=test-<number>
 baseurl = https://satellite.../content/dist/rhel/server/7/7Server/x86_64/os
 enabled=1
 gpgcheck=0
 sslverify=0
 sslclientkey = /etc/pki/entitlement/...-key.pem
 sslclientcert = /etc/pki/entitlement/....pem
Procedure

  1. Create a ConfigMap containing the Satellite repository configuration file:

    $ oc create configmap yum-repos-d --from-file /path/to/satellite.repo

  2. Add the Satellite repository configuration to the BuildConfig:

    source:
    configMaps:
    - configMap:
        name: yum-repos-d
      destinationDir: yum.repos.d

Docker builds using Red Hat Satellite subscriptions

Docker strategy builds can use Red Hat Satellite repositories to install subscription content.

Prerequisites

  • The entitlement keys and Satellite repository configurations must be added as build inputs.

Procedure

Use the following as an example Dockerfile to install content with Satellite:

FROM registry.redhat.io/rhel7:latest
USER root
# Copy entitlements
COPY ./etc-pki-entitlement /etc/pki/entitlement
# Copy repository configuration
COPY ./yum.repos.d /etc/yum.repos.d
# Delete /etc/rhsm-host to use entitlements from the build container
RUN sed -i".org" -e "s#^enabled=1#enabled=0#g" /etc/yum/pluginconf.d/subscription-manager.conf (1)
#RUN cat /etc/yum/pluginconf.d/subscription-manager.conf
RUN yum clean all
#RUN yum-config-manager
RUN rm /etc/rhsm-host && \
    # yum repository info provided by Satellite
    yum -y update && \
    yum -y install <rpms> && \
    # Remove entitlements
    rm -rf /etc/pki/entitlement
# OpenShift requires images to run as non-root by default
USER 1001
ENTRYPOINT ["/bin/bash"]
1 If adding Satellite configurations to builds using enabled=1 fails, add RUN sed -i".org" -e "s#^enabled=1#enabled=0#g" /etc/yum/pluginconf.d/subscription-manager.conf to the Dockerfile.

Squash layers with docker builds

Docker builds normally create a layer representing each instruction in a Dockerfile. Setting the imageOptimizationPolicy to SkipLayers merges all instructions into a single layer on top of the base image.

Procedure

  • Set the imageOptimizationPolicy to SkipLayers:

    strategy:
  dockerStrategy:
    imageOptimizationPolicy: SkipLayers

Additional resources