Provisionamento di Fedora CoreOS su Nutanix AHV

Questa guida mostra come fornire nuovi nodi Fedora CoreOS (FCOS) su Nutanix AHV. Attualmente Fedora non pubblica immagini di Fedora CoreOS su Nutanix, quindi è necessario caricare un’immagine Nutanix nella tua sottoscrizione di Nutanix Prism Central.

Prerequisiti

Prima di configurare una macchina FCOS, è necessario avere un file di configurazione Ignition con le proprie personalizzazioni. Se non ne hai uno, consulta Produzione di un File Ignition.

Fedora CoreOS dispone di un utente predefinito core che può essere utilizzato per esplorare il sistema operativo. Se desideri utilizzarlo, completa la sua configurazione fornendo, ad esempio, una chiave SSH.

You also need to have access to a Nutanix Prism Central subscription. The examples below use the curl command to access Nutanix Prism Central APIs.

Uploading an image to Nutanix AHV

Fedora CoreOS is designed to be updated automatically, with different schedules per stream. Once you have picked the relevant stream, use the Nutanix Prism Central API to upload the latest image to Nutanix:

STREAM=stable
IMAGE_NAME=<name of image to create>
API_HOST=<Prism Central hostname>
API_USERNAME=<username>
API_PASSWORD=<password>

URL=$(curl https://builds.coreos.fedoraproject.org/streams/${STREAM}.json | \
    jq -r .architectures.x86_64.artifacts.nutanix.formats.qcow2.disk.location)
ENCODED_CREDS="$(echo -n "${API_USERNAME}:${API_PASSWORD}" | base64)"

curl -X POST --header "Content-Type: application/json" \
    --header "Accept: application/json" \
    --header "Authorization: Basic ${ENCODED_CREDS}" \
    "https://${API_HOST}:9440/api/nutanix/v3/images" \
    -d @- << EOF
{
  "spec": {
    "name": "${IMAGE_NAME}",
    "resources": {
      "image_type": "ISO_IMAGE",
      "source_uri": "${URL}",
      "architecture": "X86_64",
      "source_options": {
        "allow_insecure_connection": false
      }
    },
    "description": "string"
  },
  "api_version": "3.1.0",
  "metadata": {
    "use_categories_mapping": false,
    "kind": "image",
    "spec_version": 0,
    "categories_mapping": {},
    "should_force_translate": true,
    "entity_version": "string",
    "categories": {},
    "name": "string"
  }
}
EOF

Avvio di un’istanza VM

You can provision an FCOS instance using the Nutanix Prism Central web portal or via the Prism Central API with curl. Ignition configuration can be passed to the VM as a "cloud-init custom script". For example, to launch a VM using the API:

API_HOST=<Prism Central hostname>
API_USERNAME=<username>
API_PASSWORD=<password>
CLUSTER_REFERENCE_NAME=<name of cluster to use>
CLUSTER_REFERENCE_UUID=<uuid of cluster to use>
SUBNET_REFERENCE_NAME=<name of subnet to use>
SUBNET_REFERENCE_UUID=<uuid of subnet to use>
VM_NAME=<name of VM to create>
IGNITION_CONFIG=config.ign
IMAGE_NAME=<name of image>

ENCODED_CONFIG="$(cat ${IGNITION_CONFIG} | base64 -w 0)"
ENCODED_CREDS="$(echo -n "${API_USERNAME}:${API_PASSWORD}" | base64)"
IMAGE_ID=$(curl -X POST --header "Content-Type: application/json" \
    --header "Accept: application/json" \
    --header "Authorization: Basic ${ENCODED_CREDS}" \
    "https://${API_HOST}:9440/api/nutanix/v3/images/list"
    -d '{ "kind": "image","filter": "", "length": 30, "offset": 0}' | \
    jq -r '.entities[] | select(.spec.name == "${IMAGE_NAME}") | .metadata.uuid')


curl -X POST --header "Content-Type: application/json" \
    --header "Accept: application/json" \
    --header "Authorization: Basic ${ENCODED_CREDS}" \
    "https://${API_HOST}:9440/api/nutanix/v3/vms" \
    -d @- << EOF
{
   "spec": {
      "name": "${VM_NAME}",
      "resources": {
         "power_state": "ON",
         "num_vcpus_per_socket": 1,
         "num_sockets": 1,
         "memory_size_mib": 16384,
         "disk_list": [
            {
               "disk_size_mib": 32768,
               "device_properties": {
                  "device_type": "DISK",
                  "disk_address": {
                     "device_index": 0,
                     "adapter_type": "SCSI"
                  }
               },
               "data_source_reference": {
                  "kind": "image",
                  "uuid": "${IMAGE_ID}"
               }
            }
         ],
         "nic_list": [
            {
               "nic_type": "NORMAL_NIC",
               "is_connected": true,
               "ip_endpoint_list": [
                  {
                     "ip_type": "DHCP"
                  }
               ],
               "subnet_reference": {
                  "kind": "subnet",
                  "name": "${SUBNET_REFERENCE_NAME}",
                  "uuid": "${SUBNET_REFERENCE_UUID}"
               }
            }
         ],
         "guest_tools": {
            "nutanix_guest_tools": {
               "state": "ENABLED",
               "iso_mount_state": "MOUNTED"
            }
         },
         "guest_customization": {
            "cloud_init": {
               "user_data": "${ENCODED_CONFIG}"
            },
            "is_overridable": false
         }
      },
      "cluster_reference": {
         "kind": "cluster",
         "name": "${CLUSTER_REFERENCE_NAME}",
         "uuid": "${CLUSTER_REFERENCE_UUID}"
      }
   },
   "api_version": "3.1.0",
   "metadata": {
      "kind": "vm"
   }
}
EOF

You now should be able to SSH into the instance using the associated IP address.

Example connecting
ssh core@<ip address>

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