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Chapter 12. Installing on Nutanix

If you install OpenShift Container Platform on Nutanix, the Assisted Installer can integrate the OpenShift Container Platform cluster with the Nutanix platform, which exposes the Machine API to Nutanix and enables autoscaling and the dynamic provisioning of storage containers with the Nutanix Container Storage Interface (CSI).

Important

To deploy an OpenShift Container Platform cluster and maintain its daily operation, you need access to a Nutanix account with the necessary environment requirements. For details, see Environment requirements.

12.1. Adding hosts on Nutanix with the UI
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To add hosts on Nutanix with the user interface (UI), generate the minimal discovery image ISO from the Assisted Installer. This downloads a smaller image that will fetch the data needed to boot a host with networking and is the default setting. The majority of the content downloads upon boot. The ISO image is about 100MB in size.

After this is complete, you must create an image for the Nutanix platform and create the Nutanix virtual machines.

Prerequisites

  • You have created a cluster profile in the Assisted Installer UI.
  • You have a Nutanix cluster environment set up, and made a note of the cluster name and subnet name.

Procedure

  1. In the Cluster details page, select Nutanix from the Integrate with external partner platforms dropdown list. The Include custom manifest checkbox is optional.
  2. In the Host discovery page, click the Add hosts button.

  3. Optional: Add an SSH public key so that you can connect to the Nutanix VMs as the core user. Having a login to the cluster hosts can provide you with debugging information during the installation.

    1. If you do not have an existing SSH key pair on your local machine, follow the steps in Generating a key pair for cluster node SSH access.
    2. In the SSH public key field, click Browse to upload the id_rsa.pub file containing the SSH public key or drag and drop the file into the field from the file manager. To see the file in the file manager, select Show hidden files in the menu.

  4. Select the required provisioning type.

    Note

    Minimal image file: Provision with virtual media downloads a smaller image that will fetch the data needed to boot.

  5. In Networking, select Cluster-managed networking. Nutanix does not support User-managed networking.

    1. Optional: If the cluster hosts require the use of a proxy, select Configure cluster-wide proxy settings. Enter the username, password, required domains or IP addresses, and port for the HTTP and HTTPS URLs of the proxy server. If the cluster hosts are behind a firewall, allow the nodes to access the required domains or IP addresses through the firewall. See Configuring your firewall for OpenShift Container Platform for more information.

      Note

      The proxy username and password must be URL-encoded.

    2. Optional: Configure the discovery image if you want to boot it with an ignition file. See Configuring the discovery image for additional details.
  6. Click Generate Discovery ISO.
  7. Copy the Discovery ISO URL.
  8. In the Nutanix Prism UI, follow the directions to upload the discovery image from the Assisted Installer.

  9. In the Nutanix Prism UI, create the control plane (master) VMs through Prism Central.

    1. Enter the Name. For example, control-plane or master.
    2. Enter the Number of VMs. This should be 3, 4, or 5 for the control plane.
    3. Ensure the remaining settings meet the minimum requirements for control plane hosts.

  10. In the Nutanix Prism UI, create the worker VMs through Prism Central.

    1. Enter the Name. For example, worker.
    2. Enter the Number of VMs. You should create at least 2 worker nodes.
    3. Ensure the remaining settings meet the minimum requirements for worker hosts.
  11. Return to the Assisted Installer user interface and wait until the Assisted Installer discovers the hosts and each of them have a Ready status.
  12. Continue with the installation procedure.

12.2. Adding hosts on Nutanix with the API
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To add hosts on Nutanix with the API, generate the discovery image ISO from the Assisted Installer. Use the minimal discovery image ISO. This is the default setting. The image includes only what is required to boot a host with networking. The majority of the content is downloaded upon boot. The ISO image is about 100MB in size.

Once this is complete, you must create an image for the Nutanix platform and create the Nutanix virtual machines.

Prerequisites

  • You have set up the Assisted Installer API authentication.
  • You have created an Assisted Installer cluster profile.
  • You have created an Assisted Installer infrastructure environment.
  • You have your infrastructure environment ID exported in your shell as $INFRA_ENV_ID.
  • You have completed the Assisted Installer cluster configuration.
  • You have a Nutanix cluster environment set up, and made a note of the cluster name and subnet name.

Procedure

  1. Configure the discovery image if you want it to boot with an ignition file.

  2. Create a Nutanix cluster configuration file to hold the environment variables: 

    $ touch ~/nutanix-cluster-env.sh
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    $ chmod +x ~/nutanix-cluster-env.sh
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    If you have to start a new terminal session, you can reload the environment variables easily. For example: 

    $ source ~/nutanix-cluster-env.sh
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  3. Assign the Nutanix cluster’s name to the NTX_CLUSTER_NAME environment variable in the configuration file: 

    $ cat << EOF >> ~/nutanix-cluster-env.sh
export NTX_CLUSTER_NAME=<cluster_name>
EOF
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    Replace <cluster_name> with the name of the Nutanix cluster.

  4. Assign the Nutanix cluster’s subnet name to the NTX_SUBNET_NAME environment variable in the configuration file: 

    $ cat << EOF >> ~/nutanix-cluster-env.sh
export NTX_SUBNET_NAME=<subnet_name>
EOF
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    Replace <subnet_name> with the name of the Nutanix cluster’s subnet.

  5. Refresh the API token: 

    $ source refresh-token
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  6. Get the download URL: 

    $ curl -H "Authorization: Bearer ${API_TOKEN}" \
https://api.openshift.com/api/assisted-install/v2/infra-envs/${INFRA_ENV_ID}/downloads/image-url
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  7. Create the Nutanix image configuration file: 

    $ cat << EOF > create-image.json
{
  "spec": {
    "name": "ocp_ai_discovery_image.iso",
    "description": "ocp_ai_discovery_image.iso",
    "resources": {
      "architecture": "X86_64",
      "image_type": "ISO_IMAGE",
      "source_uri": "<image_url>",
      "source_options": {
        "allow_insecure_connection": true
      }
    }
  },
  "metadata": {
    "spec_version": 3,
    "kind": "image"
  }
}
EOF
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    Replace <image_url> with the image URL downloaded from the previous step.

  8. Create the Nutanix image: 

    $ curl  -k -u <user>:'<password>' -X 'POST' \
'https://<domain-or-ip>:<port>/api/nutanix/v3/images \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d @./create-image.json | jq '.metadata.uuid'
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    Replace <user> with the Nutanix user name. Replace '<password>' with the Nutanix password. Replace <domain-or-ip> with the domain name or IP address of the Nutanix plaform. Replace <port> with the port for the Nutanix server. The port defaults to 9440.

  9. Assign the returned UUID to the NTX_IMAGE_UUID environment variable in the configuration file: 

    $ cat << EOF >> ~/nutanix-cluster-env.sh
export NTX_IMAGE_UUID=<uuid>
EOF
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  10. Get the Nutanix cluster UUID: 

    $ curl -k -u <user>:'<password>' -X 'POST' \
  'https://<domain-or-ip>:<port>/api/nutanix/v3/clusters/list' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "kind": "cluster"
}'  | jq '.entities[] | select(.spec.name=="<nutanix_cluster_name>") | .metadata.uuid'
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    Replace <user> with the Nutanix user name. Replace '<password>' with the Nutanix password. Replace <domain-or-ip> with the domain name or IP address of the Nutanix plaform. Replace <port> with the port for the Nutanix server. The port defaults to 9440. Replace <nutanix_cluster_name> with the name of the Nutanix cluster.

  11. Assign the returned Nutanix cluster UUID to the NTX_CLUSTER_UUID environment variable in the configuration file: 

    $ cat << EOF >> ~/nutanix-cluster-env.sh
export NTX_CLUSTER_UUID=<uuid>
EOF
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    Replace <uuid> with the returned UUID of the Nutanix cluster.

  12. Get the Nutanix cluster’s subnet UUID: 

    $ curl -k -u <user>:'<password>' -X 'POST' \
  'https://<domain-or-ip>:<port>/api/nutanix/v3/subnets/list' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "kind": "subnet",
  "filter": "name==<subnet_name>"
}' | jq '.entities[].metadata.uuid'
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    Replace <user> with the Nutanix user name. Replace '<password>' with the Nutanix password. Replace <domain-or-ip> with the domain name or IP address of the Nutanix plaform. Replace <port> with the port for the Nutanix server. The port defaults to 9440. Replace <subnet_name> with the name of the cluster’s subnet.

  13. Assign the returned Nutanix subnet UUID to the NTX_CLUSTER_UUID environment variable in the configuration file: 

    $ cat << EOF >> ~/nutanix-cluster-env.sh
export NTX_SUBNET_UUID=<uuid>
EOF
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    Replace <uuid> with the returned UUID of the cluster subnet.

  14. Ensure the Nutanix environment variables are set: 

    $ source ~/nutanix-cluster-env.sh
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  15. Create a VM configuration file for each Nutanix host. Create three to five control plane (master) VMs and at least two worker VMs. For example: 

    $ touch create-master-0.json
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    $ cat << EOF > create-master-0.json
{
   "spec": {
      "name": "<host_name>",
      "resources": {
         "power_state": "ON",
         "num_vcpus_per_socket": 1,
         "num_sockets": 16,
         "memory_size_mib": 32768,
         "disk_list": [
            {
               "disk_size_mib": 122880,
               "device_properties": {
                  "device_type": "DISK"
               }
            },
            {
               "device_properties": {
                  "device_type": "CDROM"
               },
               "data_source_reference": {
                 "kind": "image",
                 "uuid": "$NTX_IMAGE_UUID"
              }
            }
         ],
         "nic_list": [
            {
               "nic_type": "NORMAL_NIC",
               "is_connected": true,
               "ip_endpoint_list": [
                  {
                     "ip_type": "DHCP"
                  }
               ],
               "subnet_reference": {
                  "kind": "subnet",
                  "name": "$NTX_SUBNET_NAME",
                  "uuid": "$NTX_SUBNET_UUID"
               }
            }
         ],
         "guest_tools": {
            "nutanix_guest_tools": {
               "state": "ENABLED",
               "iso_mount_state": "MOUNTED"
            }
         }
      },
      "cluster_reference": {
         "kind": "cluster",
         "name": "$NTX_CLUSTER_NAME",
         "uuid": "$NTX_CLUSTER_UUID"
      }
   },
   "api_version": "3.1.0",
   "metadata": {
      "kind": "vm"
   }
}
EOF
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    Replace <host_name> with the name of the host.

  16. Boot each Nutanix virtual machine: 

    $ curl -k -u <user>:'<password>' -X 'POST' \
  'https://<domain-or-ip>:<port>/api/nutanix/v3/vms' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d @./<vm_config_file_name> | jq '.metadata.uuid'
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    Replace <user> with the Nutanix user name. Replace '<password>' with the Nutanix password. Replace <domain-or-ip> with the domain name or IP address of the Nutanix plaform. Replace <port> with the port for the Nutanix server. The port defaults to 9440. Replace <vm_config_file_name> with the name of the VM configuration file.

  17. Assign the returned VM UUID to a unique environment variable in the configuration file: 

    $ cat << EOF >> ~/nutanix-cluster-env.sh
export NTX_MASTER_0_UUID=<uuid>
EOF
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    Replace <uuid> with the returned UUID of the VM.

    Note

    The environment variable must have a unique name for each VM.

  18. Wait until the Assisted Installer has discovered each VM and they have passed validation. 

    $ curl -s -X GET "https://api.openshift.com/api/assisted-install/v2/clusters/$CLUSTER_ID"
--header "Content-Type: application/json"
-H "Authorization: Bearer $API_TOKEN"
| jq '.enabled_host_count'
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  19. Modify the cluster definition to enable integration with Nutanix: 

    $ curl https://api.openshift.com/api/assisted-install/v2/clusters/${CLUSTER_ID} \
-X PATCH \
-H "Authorization: Bearer ${API_TOKEN}" \
-H "Content-Type: application/json" \
-d '
{
    "platform_type":"nutanix"
}
' | jq
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  20. Continue with the installation procedure.

12.3. Nutanix postinstallation configuration
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Complete and validate the OpenShift Container Platform integration with the Nutanix cloud provider.

Note

By default, the installation program downloads and installs the Red Hat Enterprise Linux CoreOS (RHCOS) image. If Prism Central does not have internet access, you can host the RHCOS image on any HTTP server and point the installation program to the image or you can use Prism Central to upload the image manually.

12.3.1. Updating the Nutanix configuration settings
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After installing OpenShift Container Platform on the Nutanix platform by using the Assisted Installer, update the following Nutanix configuration settings manually.

Prerequisites

  • You have your Nutanix Prism Element username.
  • You have your Nutanix Prism Element password.
  • You have your Nutanix Prism storage container.
  • The Assisted Installer has finished installing the cluster successfully.
  • You have connected the cluster to console.redhat.com.
  • You have access to the Red Hat OpenShift Container Platform command line interface.

Procedure

  1. In the OpenShift Container Platform command line interface, update the Nutanix cluster configuration settings: 

    $ oc patch infrastructure/cluster --type=merge --patch-file=/dev/stdin <<-EOF
{
  "spec": {
    "platformSpec": {
      "nutanix": {
        "prismCentral": {
          "address": "<prismcentral_address>",
    1 
    
          "port": <prismcentral_port>
    2 
    
        },
        "prismElements": [
          {
            "endpoint": {
              "address": "<prismelement_address>",
    3 
    
              "port": <prismelement_port>
    4 
    
            },
            "name": "<prismelement_clustername>"
    5 
    
          }
        ]
      },
      "type": "Nutanix"
    }
  }
}
EOF
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    1
    Replace <prismcentral_address> with the Nutanix Prism Central address.
    2
    Replace <prismcentral_port> with the Nutanix Prism Central port.
    3
    Replace <prismelement_address> with the Nutanix Prism Element address.
    4
    Replace <prismelement_port> with the Nutanix Prism Element port.
    5
    Replace <prismelement_clustername> with the Nutanix Prism Element cluster name.

    Example output

    infrastructure.config.openshift.io/cluster patched
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    For additional details, see Creating a compute machine set on Nutanix.

    Note

    Optional: You can define prism category key and value pairs. These category key-value pairs must exist in Prism Central. You can define the key-value pairs in separate categories for compute nodes, control plane nodes, or all nodes.

  2. Create the Nutanix secret: 

    $ cat <<EOF | oc create -f -
apiVersion: v1
kind: Secret
metadata:
   name: nutanix-credentials
   namespace: openshift-machine-api
type: Opaque
stringData:
  credentials: |
[{"type":"basic_auth","data":{"prismCentral":{"username":"${<prismcentral_username>}","password":"${<prismcentral_password>}"},"prismElements":null}}]
    1
    2 
    
EOF
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    1
    Replace <prismcentral_username> with the Nutanix Prism Central username.
    2
    Replace <prismcentral_password> with the Nutanix Prism Central password.

    Example output

    secret/nutanix-credentials created
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  3. When installing OpenShift Container Platform version 4.13 or later, update the Nutanix cloud provider configuration:

    1. Get the Nutanix cloud provider configuration YAML file: 

      $ oc get cm cloud-provider-config -o yaml -n openshift-config > cloud-provider-config-backup.yaml
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    2. Create a backup of the configuration file: 

      $ cp cloud-provider-config_backup.yaml cloud-provider-config.yaml
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    3. Open the configuration YAML file: 

      $ vi cloud-provider-config.yaml
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    4. Edit the configuration YAML file as follows: 

      kind: ConfigMap
apiVersion: v1
metadata:
  name: cloud-provider-config
  namespace: openshift-config
data:
  config: |
    {
    	"prismCentral": {
    		"address": "<prismcentral_address>",
    		"port":<prismcentral_port>,
    		"credentialRef": {
    		   "kind": "Secret",
    		   "name": "nutanix-credentials",
    		   "namespace": "openshift-cloud-controller-manager"
    		}
    	},
    	"topologyDiscovery": {
    		"type": "Prism",
    		"topologyCategories": null
    	},
    	"enableCustomLabeling": true
    }
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    5. Apply the configuration updates: 

      $ oc apply -f cloud-provider-config.yaml
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      Example output

      Warning: resource configmaps/cloud-provider-config is missing the kubectl.kubernetes.io/last-applied-configuration annotation which is required by oc apply. oc apply should only be used on resources created declaratively by either oc create --save-config or oc apply. The missing annotation will be patched automatically.

configmap/cloud-provider-config configured
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12.3.2. Creating the Nutanix CSI Operator group
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Create an Operator group for the Nutanix CSI Operator.

For a description of operator groups and related concepts, see Common Operator Framework terms.

Prerequisites

  • You have updated the Nutanix configuration settings.

Procedure

  1. Open the Nutanix CSI Operator Group YAML file: 

    $ vi openshift-cluster-csi-drivers-operator-group.yaml
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  2. Edit the YAML file as follows: 

    apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  generateName: openshift-cluster-csi-drivers
  namespace: openshift-cluster-csi-drivers
spec:
  targetNamespaces:
  - openshift-cluster-csi-drivers
  upgradeStrategy: Default
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  3. Create the Operator Group: 

    $ oc create -f openshift-cluster-csi-drivers-operator-group.yaml
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    Example output

    operatorgroup.operators.coreos.com/openshift-cluster-csi-driversjw9cd created
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12.3.3. Installing the Nutanix CSI Operator
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The Nutanix Container Storage Interface (CSI) Operator for Kubernetes deploys and manages the Nutanix CSI Driver.

For instructions on performing this step through the OpenShift Container Platform web console, see the Installing the Operator section of the Nutanix CSI Operator documentation.

Prerequisites

  • You have created the Nutanix CSI Operator group.

Procedure

  1. Get the parameter values for the Nutanix CSI Operator YAML file:

    1. Check that the Nutanix CSI Operator exists: 

      $ oc get packagemanifests | grep nutanix
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      Example output

      nutanixcsioperator   Certified Operators   129m
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    2. Assign the default channel for the Operator to a BASH variable: 

      $ DEFAULT_CHANNEL=$(oc get packagemanifests nutanixcsioperator -o jsonpath={.status.defaultChannel})
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    3. Assign the starting cluster service version (CSV) for the Operator to a BASH variable: 

      $ STARTING_CSV=$(oc get packagemanifests nutanixcsioperator -o jsonpath=\{.status.channels[*].currentCSV\})
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    4. Assign the catalog source for the subscription to a BASH variable: 

      $ CATALOG_SOURCE=$(oc get packagemanifests nutanixcsioperator -o jsonpath=\{.status.catalogSource\})
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    5. Assign the Nutanix CSI Operator source namespace to a BASH variable: 

      $ SOURCE_NAMESPACE=$(oc get packagemanifests nutanixcsioperator -o jsonpath=\{.status.catalogSourceNamespace\})
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  2. Create the Nutanix CSI Operator YAML file using the BASH variables: 

    $ cat << EOF > nutanixcsioperator.yaml
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: nutanixcsioperator
  namespace: openshift-cluster-csi-drivers
spec:
  channel: $DEFAULT_CHANNEL
  installPlanApproval: Automatic
  name: nutanixcsioperator
  source: $CATALOG_SOURCE
  sourceNamespace: $SOURCE_NAMESPACE
  startingCSV: $STARTING_CSV
EOF
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  3. Create the CSI Nutanix Operator: 

    $ oc apply -f nutanixcsioperator.yaml
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    Example output

    subscription.operators.coreos.com/nutanixcsioperator created
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  4. Run the following command until the Operator subscription state changes to AtLatestKnown. This indicates that the Operator subscription has been created, and might take some time. 

    $ oc get subscription nutanixcsioperator -n openshift-cluster-csi-drivers -o 'jsonpath={..status.state}'
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12.3.4. Deploying the Nutanix CSI storage driver
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The Nutanix Container Storage Interface (CSI) Driver for Kubernetes provides scalable and persistent storage for stateful applications.

For instructions on performing this step through the OpenShift Container Platform web console, see the Installing the CSI Driver using the Operator section of the Nutanix CSI Operator documentation.

Prerequisites

  • You have installed the Nutanix CSI Operator.

Procedure

  1. Create a NutanixCsiStorage resource to deploy the driver: 

    $ cat <<EOF | oc create -f -
apiVersion: crd.nutanix.com/v1alpha1
kind: NutanixCsiStorage
metadata:
  name: nutanixcsistorage
  namespace: openshift-cluster-csi-drivers
spec: {}
EOF
    Copy to Clipboard Toggle word wrap

    Example output

    snutanixcsistorage.crd.nutanix.com/nutanixcsistorage created
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  2. Create a Nutanix secret YAML file for the CSI storage driver: 

    $ cat <<EOF | oc create -f -
apiVersion: v1
kind: Secret
metadata:
  name: ntnx-secret
  namespace: openshift-cluster-csi-drivers
stringData:
  # prism-element-ip:prism-port:admin:password
  key: <prismelement_address:prismelement_port:prismcentral_username:prismcentral_password>
    1 
    
EOF
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    1
    Replace these parameters with actual values while keeping the same format.

    Example output

    secret/nutanix-secret created
    Copy to Clipboard Toggle word wrap

12.3.5. Validating the postinstallation configurations
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Verify that you can create a storage class and a bound persistent volume claim.

Prerequisites

  • You have deployed the Nutanix CSI storage driver.

Procedure

  1. Verify that you can create a storage class: 

    $ cat <<EOF | oc create -f -
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: nutanix-volume
  annotations:
    storageclass.kubernetes.io/is-default-class: 'true'
provisioner: csi.nutanix.com
parameters:
  csi.storage.k8s.io/fstype: ext4
  csi.storage.k8s.io/provisioner-secret-namespace: openshift-cluster-csi-drivers
  csi.storage.k8s.io/provisioner-secret-name: ntnx-secret
  storageContainer: <nutanix_storage_container>
    1 
    
  csi.storage.k8s.io/controller-expand-secret-name: ntnx-secret
  csi.storage.k8s.io/node-publish-secret-namespace: openshift-cluster-csi-drivers
  storageType: NutanixVolumes
  csi.storage.k8s.io/node-publish-secret-name: ntnx-secret
  csi.storage.k8s.io/controller-expand-secret-namespace: openshift-cluster-csi-drivers
reclaimPolicy: Delete
allowVolumeExpansion: true
volumeBindingMode: Immediate
EOF
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    Note
    1
    Take <nutanix_storage_container> from the Nutanix configuration; for example, SelfServiceContainer.

    Example output

    storageclass.storage.k8s.io/nutanix-volume created
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  2. Verify that you can create the Nutanix persistent volume claim (PVC):

    1. Create the persistent volume claim (PVC): 

      $ cat <<EOF | oc create -f -
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: nutanix-volume-pvc
  namespace: openshift-cluster-csi-drivers
  annotations:
    volume.beta.kubernetes.io/storage-provisioner: csi.nutanix.com
    volume.kubernetes.io/storage-provisioner: csi.nutanix.com
  finalizers:
    - kubernetes.io/pvc-protection
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: nutanix-volume
  volumeMode: Filesystem
EOF
      Copy to Clipboard Toggle word wrap

      Example output

      persistentvolumeclaim/nutanix-volume-pvc created
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    2. Validate that the persistent volume claim (PVC) status is Bound: 

      $ oc get pvc -n openshift-cluster-csi-drivers
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      Example output

      NAME                 STATUS    VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS     AGE
nutanix-volume-pvc   Bound                                        nutanix-volume   52s
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