Feature Overview (aka. Goal Summary)  

Add support to the OpenShift Installer to specify a custom MTU to be used for the cluster network

Goals (aka. expected user outcomes)

As a user, I need to be able to provide a custom MTU to be consumed by the OpenShift Installer so I can change the cluster network MTU on day-0

Requirements (aka. Acceptance Criteria):

The OpenShift Installer will accept another parameter through the install-config manifest that will be used as an option to change the default MTU value for the cluster network

Use Cases (Optional):

Customers who are running OpenShift on environments where the network traffic between the cluster and external endpoints is limited to a certain MTU. Some examples are OpenShift clusters running on public clouds like AWS, Azure or GCP where these clusters are connected to external services running on the customer premises via direct links, VPNs, etc... and limited to a certain MTU

Background

Additional background can be found in RFE-4009

Documentation Considerations

As a new option will be added to the Installer manifest this will need to be documented as any other.