This Openshift command line tool docker image ships oc and includes gettext so you can use envsubst to substitute environment variables in your CI/CD pipeline, for example using in Jenkins or a job in GitLab CI .gitlab-ci.yml file.

Choose the version for openshift cli based on what is available on Openshift mirror: https://mirror.openshift.com/pub/

Add the version as value for ARG OC_VERSION. Example:

docker build -t myimages/openshift-cli:4.2 --build-arg OC_VERSION=4.2 .

Why should I use envsubst? You should never put secrets into your version control, so you might want to keep them in secret variables in your CI/CD system. You can use envsubst to substituted them correctly in your templates.

A CI/CD system usually sets a bunch of variables to the build environment. Below I'll show an example of GitLab CI variables set in the build environment.

• CI_PROJECT_NAME: my_awesome_project
• CI_BUILD_REF_SLUG: f1234d

Your app.yaml could look similar the one below:

$ cat app.yaml
...
- apiVersion: v1
  kind: DeploymentConfig
  metadata:
    labels:
      app: ${CI_PROJECT_NAME}
    name: sample
  spec:
    replicas: 1
    selector:
      app: ${CI_PROJECT_NAME}
      deployment: ${CI_BUILD_REF_SLUG}
...

After cat app.yaml | envsubst > app.yaml you'll notice the variables have been replaced with their actual values:

$ cat app.yaml
...
- apiVersion: v1
  kind: DeploymentConfig
  metadata:
    labels:
      app: my_awesome_project
    name: sample
  spec:
    replicas: 1
    selector:
      app: my_awesome_project
      deployment: f1234d
...

Below a sample job in an .gitlab-ci.yml file, please note that OpenShift does not allow _ in project names:

deploy:
  image: widerin/openshift-cli
  stage: deploy
  script:
    - oc login "$OPENSHIFT_SERVER" --token="$OPENSHIFT_TOKEN"
    - cat app.yaml | envsubst > app.yaml
    - oc replace -f app.yaml -n ${CI_PROJECT_NAME/_/}