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View master-0.ign
"ignition": {
"config": {
"append": [
"source": "https://api-int.iron.4391.lan:22623/config/master",
"verification": {}

A cluster admin perspective on OpenShift Cluster Operators

OpenShift 4.x relies heavily upon operators for automating all aspects of the services. Discovering which operator controls which service can be difficult and confusing, but there are some steps we can take to help make the process easier and make educated guesses.

This document focuses on OpenShift core services, not add-on operators. While much, if not all, of the information still applys to those types of operators, they are much easier to see, manage, and inflect due to their nature. Be sure to see and read about the Operator Framework for the most up to date information about them.

Some prerequesites:

  1. It's important to understand the concept of operators and how they work
  2. First level operator(s), i.e. the [Cluster Version Operator](

Removing a partially provisioned OpenShift 4.x AWS cluster

When creating an OCP cluster using openshift-installer that fails before the metadata.json file is created, cleaning up can be difficult because it doesn't know what needs to be removed. Fortunately, there is a workaround:

  • Configure AWS CLI

    This assumes you have configured the AWS CLI using your credentials. If you have not done this, follow the instructions

  • Retrieve the cluster ID


Container Image Registry

The Registry is managed by the Image Registry Operator, deployed to the openshift-image-registry project.

As of this writing (installer 0.12.0), the deployment follows the steps outlined in the manifest directory:

  1. Create the CRD
  2. Create the namespace
  3. Request credentials from the Cloud Credential Operator
  4. RBAC and ServiceAccount(s)
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