Chapitre 12. Installing on bare metal
12.1. Preparing for bare metal cluster installation
12.1.1. Conditions préalables
- You reviewed details about the OpenShift Container Platform installation and update processes.
- You have read the documentation on selecting a cluster installation method and preparing it for users.
12.1.2. Planning a bare metal cluster for OpenShift Virtualization
If you will use OpenShift Virtualization, it is important to be aware of several requirements before you install your bare metal cluster.
If you want to use live migration features, you must have multiple worker nodes at the time of cluster installation. This is because live migration requires the cluster-level high availability (HA) flag to be set to true. The HA flag is set when a cluster is installed and cannot be changed afterwards. If there are fewer than two worker nodes defined when you install your cluster, the HA flag is set to false for the life of the cluster.
NoteYou can install OpenShift Virtualization on a single-node cluster, but single-node OpenShift does not support high availability.
- Live migration requires shared storage. Storage for OpenShift Virtualization must support and use the ReadWriteMany (RWX) access mode.
- If you plan to use Single Root I/O Virtualization (SR-IOV), ensure that your network interface controllers (NICs) are supported by OpenShift Container Platform.
12.1.3. Choosing a method to install OpenShift Container Platform on bare metal
Le programme d'installation d'OpenShift Container Platform propose quatre méthodes pour déployer un cluster :
- Interactive: Vous pouvez déployer un cluster à l'aide du programme d'installation assistée basé sur le web. C'est l'approche recommandée pour les clusters avec des réseaux connectés à l'internet. L'installateur assisté est le moyen le plus simple d'installer OpenShift Container Platform, il fournit des valeurs par défaut intelligentes et effectue des validations avant l'installation du cluster. Il fournit également une API RESTful pour l'automatisation et les scénarios de configuration avancés.
- Local Agent-based: You can deploy a cluster locally with the agent-based installer for air-gapped or restricted networks. It provides many of the benefits of the Assisted Installer, but you must download and configure the agent-based installer first. Configuration is done with a commandline interface. This approach is ideal for air-gapped or restricted networks.
- Automated: You can deploy a cluster on installer-provisioned infrastructure and the cluster it maintains. The installer uses each cluster host’s baseboard management controller (BMC) for provisioning. You can deploy clusters with both connected or air-gapped or restricted networks.
- Full control: You can deploy a cluster on infrastructure that you prepare and maintain, which provides maximum customizability. You can deploy clusters with both connected or air-gapped or restricted networks.
Les grappes présentent les caractéristiques suivantes :
- Une infrastructure hautement disponible, sans point de défaillance unique, est disponible par défaut.
- Les administrateurs gardent le contrôle sur les mises à jour qui sont appliquées et sur le moment où elles le sont.
See Installation process for more information about installer-provisioned and user-provisioned installation processes.
12.1.3.1. Installing a cluster on installer-provisioned infrastructure
You can install a cluster on bare metal infrastructure that is provisioned by the OpenShift Container Platform installation program, by using the following method:
- Installing an installer-provisioned cluster on bare metal: You can install OpenShift Container Platform on bare metal by using installer provisioning.
12.1.3.2. Installing a cluster on user-provisioned infrastructure
You can install a cluster on bare metal infrastructure that you provision, by using one of the following methods:
- Installing a user-provisioned cluster on bare metal: You can install OpenShift Container Platform on bare metal infrastructure that you provision. For a cluster that contains user-provisioned infrastructure, you must deploy all of the required machines.
- Installing a user-provisioned bare metal cluster with network customizations: You can install a bare metal cluster on user-provisioned infrastructure with network-customizations. By customizing your network configuration, your cluster can coexist with existing IP address allocations in your environment and integrate with existing MTU and VXLAN configurations. Most of the network customizations must be applied at the installation stage.
- Installing a user-provisioned bare metal cluster on a restricted network: You can install a user-provisioned bare metal cluster on a restricted or disconnected network by using a mirror registry. You can also use this installation method to ensure that your clusters only use container images that satisfy your organizational controls on external content.
