text: The OpenShift architecture builds on top of Kubernetes and consists of three types of roles 
  for the nodes: 
  
  (cid:2) Master: These nodes are Kubernetes Master Nodes that can provide more functions, such 
  
  as the web console with the self-service portal, and the developers and 
  operations-focused dashboards. 
  
  **Important:**Because of the consensus that is required by the RAFT algorithm, the etcd 
  service must be deployed in odd numbers to maintain quorum. For this reason, the 
  minimum number of etcd instances for production environments is three. 
  
  (cid:2) Infrastructure: These nodes are Kubernetes Worker Nodes that are dedicated to host 
  functions, such as the OpenShift Routes and the OpenShift internal registry. 
  
  (cid:2) Worker: These nodes are the Kubernetes Worker Nodes that are used to run the 
  microservices and containerized applications that are deployed on OpenShift. 
  
  Master and Infrastructure roles can run on the same node. 
  
  Nodes can run on top of PowerVC, PowerVM, Red Hat Virtualization, KVM, or run bare metal 
  environment. Table 5-6 lists the IBM Power Systems Infrastructure Landscape for OpenShift 
  Container Platform 3.11. 