6.2.2. Machine requirements for a cluster with user-provisioned infrastructure
For a cluster that contains user-provisioned infrastructure, you must deploy all of the required machines.
126.96.36.199. Required machines
The smallest OpenShift Container Platform clusters require the following hosts:
- One temporary bootstrap machine
- Three control plane, or master, machines
- At least two compute machines, which are also known as worker machines.
The cluster requires the bootstrap machine to deploy the OpenShift Container Platform cluster on the three control plane machines. You can remove the bootstrap machine after you install the cluster.
To improve high availability of your cluster, distribute the control plane machines over different z/VM instances on at least two physical machines.
The bootstrap and control plane machines must use Red Hat Enterprise Linux CoreOS (RHCOS) as the operating system.
Note that RHCOS is based on Red Hat Enterprise Linux (RHEL) 8 and inherits all of its hardware certifications and requirements. See Red Hat Enterprise Linux technology capabilities and limits.