How to create a custom Service and script to fire on OpenShift 4 nodes after boot (modifying /etc/hosts)

Solution Verified - Updated 2025-06-05T13:50:23+00:00 -

Issue

It may be necessary to deploy a custom script or modifications to your OpenShift 4 CoreOS nodes after deployment, and the file you are attempting to modify may be managed or generated by a custom service
How to modify /etc/hosts on OpenShift 4, or how to modify other target files that are otherwise managed by scripts on CoreOS
How to deploy a custom service for one-shot changes to an OpenShift node?

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