KIB for Azure

Learn how to build a custom Azure Image for use with DKP

This procedure describes how to use the KIB to create a Cluster API compliant Azure Virtual Machine (VM) Image. The VM Image contains the base operating system you specify and all the necessary Kubernetes components. The Konvoy Image Builder uses variable overrides to specify the base image and container images to use in your new Azure VM image.

The default Azure image is not recommended for use in production. We suggest using Konvoy Image Builder to build the image in order to take advantage of enhanced cluster operations. To explore more information on this topic refer to the Azure Infrastructure.

Prerequisites

Before you begin, you must:

Check the DKP Supported Kubernetes Version and download the KIB bundle (prefixed with konvoy-image-bundle) for your OS. Do not use the release prefixed with konvoy-image-builder.
Create a working Docker setup.

Extract the Bundle

Extract the bundle and cd into the extracted konvoy-image-bundle-$VERSION_$OS folder. The bundled version of konvoy-image contains an embedded docker image that contains all the requirements for building.

The konvoy-image binary and all supporting folders are also extracted. When run, konvoy-image bind mounts the current working directory (${PWD}) into the container to be used.

Configure Azure Prerequisites

If you have already followed the Azure Prerequisites topic steps, then the environment variables needed by KIB ([AZURE_CLIENT_SECRET, AZURE_CLIENT_ID, AZURE_TENANT_ID, AZURE_SUBSCRIPTION_ID] ) are set and do not need repeated if you are still working in the same window.

If you have not executed the Azure Prerequisite steps, they are listed below.

Sign in to Azure:

CODE

az login

CODE

[
  {
    "cloudName": "AzureCloud",
    "homeTenantId": "a1234567-b132-1234-1a11-1234a5678b90",
    "id": "b1234567-abcd-11a1-a0a0-1234a5678b90",
    "isDefault": true,
    "managedByTenants": [],
    "name": "Mesosphere Developer Subscription",
    "state": "Enabled",
    "tenantId": "a1234567-b132-1234-1a11-1234a5678b90",
    "user": {
      "name": "user@azuremesosphere.onmicrosoft.com",
      "type": "user"
    }
  }
]

Create an Azure Service Principal (SP) by running the following command:

If an SP with the name exists, this command will rotate the password.

CODE

az ad sp create-for-rbac --role contributor --name "$(whoami)-konvoy" --scopes=/subscriptions/$(az account show --query id -o tsv) --query "{ client_id: appId, client_secret: password, tenant_id: tenant }"

CODE

{
  "client_id": "7654321a-1a23-567b-b789-0987b6543a21",
  "client_secret": "Z79yVstq_E.R0R7RUUck718vEHSuyhAB0C",
  "tenant_id": "a1234567-b132-1234-1a11-1234a5678b90"
}

Set the AZURE_CLIENT_SECRET environment variable:

CODE

export AZURE_CLIENT_SECRET="<azure_client_secret>" # Z79yVstq_E.R0R7RUUck718vEHSuyhAB0C
export AZURE_CLIENT_ID="<client_id>"               # 7654321a-1a23-567b-b789-0987b6543a21
export AZURE_TENANT_ID="<tenant_id>"               # a1234567-b132-1234-1a11-1234a5678b90
export AZURE_SUBSCRIPTION_ID="<subscription_id>"   # b1234567-abcd-11a1-a0a0-1234a5678b90

Ensure you have an override file to configure specific attributes of your Azure image.

Build the Image

Run the konvoy-image command to build and validate the image.

CODE

konvoy-image build azure --client-id ${AZURE_CLIENT_ID} --tenant-id ${AZURE_TENANT_ID} --overrides override-source-image.yaml images/azure/ubuntu-2004.yaml

By default, the image builder builds in the westus2 location. To specify another location set the --location flag (shown in example below is how to change the location to eastus):

CODE

konvoy-image build azure --client-id ${AZURE_CLIENT_ID} --tenant-id ${AZURE_TENANT_ID} --location eastus --overrides override-source-image.yaml images/azure/centos-7.yaml

When the command is complete, the image id is printed and written to ./manifest.json. You should then specify this image id when creating the cluster.

Image Gallery

By default Konvoy Image Builder will create a Resource Group, Gallery, and Image Name to store the resulting image in. To specify a specific Resource Group, Gallery, or Image Name flags may be specified:

CODE

--gallery-image-locations string     a list of locations to publish the image (default same as location)
--gallery-image-name string          the gallery image name to publish the image to
--gallery-image-offer string         the gallery image offer to set (default "dkp")
--gallery-image-publisher string     the gallery image publisher to set (default "dkp")
--gallery-image-sku string           the gallery image sku to set
--gallery-name string                the gallery name to publish the image in (default "dkp")
--resource-group string              the resource group to create the image in (default "dkp")

When creating your cluster, you will then add this flag during the create process for your custom image: --compute-gallery-id "<Managed Image Shared Image Gallery Id>". See Create a New Azure Cluster for specific consumption of image commands.

The SKU and Image Name will default to the values found in the image YAML.