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Chapitre 11. Installing on Nutanix

11.1. Preparing to install on Nutanix
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Before you install an OpenShift Container Platform cluster, be sure that your Nutanix environment meets the following requirements.

11.1.1. Nutanix version requirements
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You must install the OpenShift Container Platform cluster to a Nutanix environment that meets the following requirements.

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Tableau 11.1. Version requirements for Nutanix virtual environments
ComposantRequired version

Nutanix AOS

5.20.4+ or 6.5.1+

Prism Central

2022.4+

11.1.2. Environment requirements
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Before you install an OpenShift Container Platform cluster, review the following Nutanix AOS environment requirements.

11.1.2.1. Required account privileges
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Installing a cluster to Nutanix requires an account with administrative privileges to read and create the required resources.

11.1.2.2. Cluster limits
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Available resources vary between clusters. The number of possible clusters within a Nutanix environment is limited primarily by available storage space and any limitations associated with the resources that the cluster creates, and resources that you require to deploy the cluster, such a IP addresses and networks.

11.1.2.3. Cluster resources
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A minimum of 800 GB of storage is required to use a standard cluster.

When you deploy a OpenShift Container Platform cluster that uses installer-provisioned infrastructure, the installation program must be able to create several resources in your Nutanix instance. Although these resources use 856 GB of storage, the bootstrap node is destroyed as part of the installation process.

A standard OpenShift Container Platform installation creates the following resources:

  • 1 label

  • Virtual machines:

    • 1 disk image
    • 1 temporary bootstrap node
    • 3 control plane nodes
    • 3 compute machines

11.1.2.4. Networking requirements
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You must use AHV IP Address Management (IPAM) for the network and ensure that it is configured to provide persistent IP addresses to the cluster machines. Additionally, create the following networking resources before you install the OpenShift Container Platform cluster:

  • IP addresses
  • DNS records
Note

It is recommended that each OpenShift Container Platform node in the cluster have access to a Network Time Protocol (NTP) server that is discoverable via DHCP. Installation is possible without an NTP server. However, an NTP server prevents errors typically associated with asynchronous server clocks.

11.1.2.4.1. Required IP Addresses
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An installer-provisioned installation requires two static virtual IP (VIP) addresses:

  • A VIP address for the API is required. This address is used to access the cluster API.
  • A VIP address for ingress is required. This address is used for cluster ingress traffic.

You specify these IP addresses when you install the OpenShift Container Platform cluster.

11.1.2.4.2. DNS records
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You must create DNS records for two static IP addresses in the appropriate DNS server for the Nutanix instance that hosts your OpenShift Container Platform cluster. In each record, <cluster_name> is the cluster name and <base_domain> is the cluster base domain that you specify when you install the cluster.

A complete DNS record takes the form: <component>.<cluster_name>.<base_domain>..

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Tableau 11.2. Required DNS records
ComposantRecordDescription

API VIP

api.<cluster_name>.<base_domain>.

This DNS A/AAAA or CNAME record must point to the load balancer for the control plane machines. This record must be resolvable by both clients external to the cluster and from all the nodes within the cluster.

Ingress VIP

*.apps.<cluster_name>.<base_domain>.

A wildcard DNS A/AAAA or CNAME record that points to the load balancer that targets the machines that run the Ingress router pods, which are the worker nodes by default. This record must be resolvable by both clients external to the cluster and from all the nodes within the cluster.

The Cloud Credential Operator (CCO) manages cloud provider credentials as Kubernetes custom resource definitions (CRDs). To install a cluster on Nutanix, you must set the CCO to manual mode as part of the installation process.

Pour créer et gérer des informations d'identification du nuage depuis l'extérieur du cluster lorsque le Cloud Credential Operator (CCO) fonctionne en mode manuel, extrayez et préparez le binaire de l'utilitaire CCO (ccoctl).

Note

L'utilitaire ccoctl est un binaire Linux qui doit être exécuté dans un environnement Linux.

Conditions préalables

  • Vous avez accès à un compte OpenShift Container Platform avec un accès administrateur de cluster.
  • Vous avez installé l'OpenShift CLI (oc).

Procédure

  1. Obtenez l'image de la version d'OpenShift Container Platform en exécutant la commande suivante : 

    $ RELEASE_IMAGE=$(./openshift-install version | awk '/release image/ {print $3}')
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  2. Obtenez l'image du conteneur CCO à partir de l'image de la version d'OpenShift Container Platform en exécutant la commande suivante : 

    $ CCO_IMAGE=$(oc adm release info --image-for='cloud-credential-operator' $RELEASE_IMAGE -a ~/.pull-secret)
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    Note

    Veillez à ce que l'architecture de $RELEASE_IMAGE corresponde à l'architecture de l'environnement dans lequel vous utiliserez l'outil ccoctl.

  3. Extrayez le binaire ccoctl de l'image du conteneur CCO dans l'image de la version d'OpenShift Container Platform en exécutant la commande suivante : 

    $ oc image extract $CCO_IMAGE --file="/usr/bin/ccoctl" -a ~/.pull-secret
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  4. Modifiez les autorisations pour rendre ccoctl exécutable en exécutant la commande suivante : 

    $ chmod 775 ccoctl
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Vérification

  • Pour vérifier que ccoctl est prêt à être utilisé, affichez le fichier d'aide en exécutant la commande suivante : 

    $ ccoctl --help
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    Sortie de ccoctl --help:

    OpenShift credentials provisioning tool

Usage:
  ccoctl [command]

Available Commands:
  alibabacloud Manage credentials objects for alibaba cloud
  aws          Manage credentials objects for AWS cloud
  gcp          Manage credentials objects for Google cloud
  help         Help about any command
  ibmcloud     Manage credentials objects for IBM Cloud
  nutanix      Manage credentials objects for Nutanix

Flags:
  -h, --help   help for ccoctl

Use "ccoctl [command] --help" for more information about a command.
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