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11.5.3. Requirements for the RHV environment

To install and run an OpenShift Container Platform cluster, the RHV environment must meet the following requirements. Not meeting these requirements can cause failures.

The following requirements for CPUs, memory, and storage are based on default values multiplied by the default number of virtual machines the installation program creates.

By default, the installation program creates seven machines during the installation process, which includes one bootstrap machine. When the installation program finishes, it deletes the bootstrap machine and frees up its resources. If you perform a custom installation, you can increase the number of virtual machines the installation program creates.

重要

If you increase the number of virtual machines or resources in the install_config.yaml file, you must also increase these requirements.

Requirements

  • The RHV version is 4.3.10 or later.
  • The RHV environment has one data center whose state is Up.
  • The RHV data center contains an RHV cluster.
  • The RHV cluster has the following resources exclusively for the OpenShift Container Platform cluster:

    • Minimum 28 vCPUs, which is 4 vCPUs for each of the seven virtual machines created during installation.
    • 112 GiB RAM or more, including:

      • 16 GiB or more for the bootstrap machine, which provides the temporary control plane.
      • 16 GiB or more for each of the three control plane machines which provide the control plane.
      • 16 GiB or more for each of the three compute machines, which run the application workloads.
  • The RHV storage domain must meet these etcd backend performance requirements.
  • In production environments, each virtual machine must have 120 GiB or more, so the storage domain must have 840 GiB or more for the OpenShift Container Platform cluster. In resource-constrained or non-production environments, each virtual machine must have 32 GiB or more, so the storage domain must have 230 GiB or more for the OpenShift Container Platform cluster.
  • The RHV cluster must have access to an Internet connection to download images from the Red Hat Ecosystem Catalog during installation and updates, and for the Telemetry service to simplify the subscription and entitlement process.
  • The RHV cluster has a virtual network with access to the REST API on the RHV Manager. Ensure that DHCP is enabled on this network, because the VMs that the installer creates obtain their IP address by using DHCP.
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  • All together, the hosts must have the required memory and CPU resources in addition to and aside from what they use to operate or provide to non-OpenShift Container Platform operations.
  • The release cycles of OpenShift Container Platform and RHV are different and versions tested might vary in the future depending on the release dates of both products.
  • The bootstrap machine provides a temporary control plane while the installation program creates the OpenShift Container Platform cluster. After it creates the cluster, the installation program removes the bootstrap machine and releases its resources.