Minimum network bandwidth required to install an OpenShift 4 cluster
Environment
- Red Hat OpenShift Container Platform (RHOCP)
- 4
- Installation
Issue
- What is the minimum network bandwidth required to install an RHOCP4 cluster?
- OpenShift 4 cluster deploy fails due to slow internet connection.
Resolution
There are currently no specific figures for network bandwidth. This is because of dependent on the conditions and environment, so it is difficult to give a specific number. But there have been known cases where OpenShift 4 cluster deployments have sometimes failed on the environment having 50MBps ~ 70MBps internet connection speed.
To install the OpenShift 4 cluster, several tens of gigabytes need to be retrieved from the public image registry. If the image is pulled slowly enough that the timeout period is reached, the installation process will fail. Therefore, need to ensure that the Internet connection is fast enough.
Based on the above, This content is not included.RFE-7117 has been created to share images already pulled between nodes, to allow reducing the number of times an image needs to be pulled from different nodes.
Workaround
As a current workaround, it is possible to setting up a local mirror registry, as explained in the documentation for [disconnected installation](https://docs.openshift.com/container-platform/4.16/installing/disconnected_install/index.html).
Root Cause
OpenShift 4 cluster installation fails due to slow internet as many images needs to be pulled from Red Hat registry.
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