第 7 章 Adding RHEL compute machines to an OpenShift Container Platform cluster
In OpenShift Container Platform, you can add Red Hat Enterprise Linux (RHEL) compute, or worker, machines to a user-provisioned infrastructure cluster or a installation-provisioned infrastructure cluster. You can use RHEL as the operating system on only compute machines.
7.1. About adding RHEL compute nodes to a cluster
In OpenShift Container Platform 4.5, you have the option of using Red Hat Enterprise Linux (RHEL) machines as compute machines, which are also known as worker machines, in your cluster if you use a user-provisioned infrastructure installation. You must use Red Hat Enterprise Linux CoreOS (RHCOS) machines for the control plane, or master, machines in your cluster.
As with all installations that use user-provisioned infrastructure, if you choose to use RHEL compute machines in your cluster, you take responsibility for all operating system life cycle management and maintenance, including performing system updates, applying patches, and completing all other required tasks.
Because removing OpenShift Container Platform from a machine in the cluster requires destroying the operating system, you must use dedicated hardware for any RHEL machines that you add to the cluster.
Swap memory is disabled on all RHEL machines that you add to your OpenShift Container Platform cluster. You cannot enable swap memory on these machines.
You must add any RHEL compute machines to the cluster after you initialize the control plane.
