How to change the MTU in Openshift 4 post-installation

Solution Verified - Updated -

Issue

  • As an Openshift administrator I'd like to increase the MTU of the primary network interface and the SDN, because the network where Openshift is deployed supports MTU's higher than 1500 bytes.

  • As an Openshift administrator I'd like to decrease the MTU of the primary network interface and the SDN, because the network where Openshift is deployed requires the MTU to be lower than 1500 bytes.

  • The cluster is already installed and can't be reinstalled to configure MTU via other day-1 methods.

Environment

  • Red Hat Openshift 4

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