The following requirements must be met before deploying an OpenShift cluster:
- DNS: Records for ingress and API Virtual IPs are required for accessing the cluster, however, such VIPs are managed by the cluster itself so, no external load balancer is required.
- SSH public key: This key must be generated on the workstation from where the nodes will be accessed, and this key will be used to authenticate SSH access to the nodes, for example, for troubleshooting during deployment, or longer-term maintenance post-deployment. For more details on SSH key generation, see Generating a key pair for cluster node SSH access.
- NTP server: For time synchronization among hosts.
- As part of network requirements, all the nodes of OpenShift cluster must have connectivity to the Internet.
For more details on the prerequisites, see Assisted Installer prerequisites.