CODEWITHSUNDEEP
pythonautomationopenshiftconfigmap
yonatang0401
yonatang0401

Reputation: 5

Is there a way to edit my openshift configmap using oc command

I am trying to create a simple automation to replace my config map content in OpenShift from the current one to an edited yaml file, I have tried many oc commands and failed, I was wondering if any one had an idea of how to do this.

Just to make u understand: I'm usingoc get congifmap <configmap name> to get the current configmap from my project, Then I am using python to make my changes to the configmap data. then I want to change the current config map to the new edited one. I tried edit, apply, change but they all failed.

Would appreciate the help :)

Upvotes: 0

Views: 5698

Answers (2)

titou10
titou10

Reputation: 2977

There is an"oc"command for such use case:oc patch

With"oc patch"you can edit, replace, add, remove parts of any OCP object

If you google "oc patch" you'll find many example on the net

Official OCP v4.7 oc patch doc
Tons of examples here
OC patch "man" page
Other examples

Upvotes: 1

Hector Vido
Hector Vido

Reputation: 852

You just need to work with "inputs" and "outputs".

Imagine a lighttpd.conf:

server.modules = (
    "mod_scgi",
    "mod_compress",
    "mod_accesslog"
)

oc create cm lighttpd --from-file lighttpd.conf

So, as a example, let's change the mod_scgi to mod_fastcgi. So I wrote this script:

import fileinput

for line in fileinput.input():
  if 'mod_scgi' in line:
    print(line.replace('scgi', 'fastcgi').rstrip())
  else:
    print(line.rstrip())

So, to change the configMap, update it's value and apply again:

oc get cm -o yaml | python modify.py | oc apply -f -
  • get -o yaml prints all information on screen
  • output goes to the script modify.py
  • modify.py change and print the lines as they are read from standard input
  • output goes to oc
  • oc apply -f - reads from standard input and apply

Upvotes: 0

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