5장. Installing a cluster on OpenStack in a disconnected environment

You can install OpenShift Container Platform 4.20 in a restricted network without an active internet connection to obtain software components. Restricted network installations can use installer-provisioned or user-provisioned infrastructure, depending on the cloud platform to which you are installing the cluster.

If you perform a restricted network installation on a cloud platform, you still require access to its cloud APIs. Some cloud functions, such as Amazon Web Service’s Route 53 DNS and IAM services, require internet access. Depending on your network, you might require less internet access for an installation on bare-metal hardware, Nutanix, or on VMware vSphere.

To complete a restricted network installation, you must create a registry that mirrors the contents of the OpenShift image registry and has the installation media. You can create this registry on a mirror host, which can access both the internet and your closed network, or by using other methods that meet your restrictions.