Tutorial: Use Azure Key Vault to store VM secrets with Ansible

บทความ
02/01/2022

In this quickstart, you'll create and retrieve secrets from Azure key vault with Ansible.

Important

Ansible 2.9 (or later) is required to run the sample playbooks in this article.

In this article, you learn how to:

Create an Azure key vault instance
Create a secret store in Azure key vault
Get secrets from Azure key vault with Ansible

Prerequisites

Azure subscription: If you don't have an Azure subscription, create a free account before you begin.

Azure service principal: Create a service principal, making note of the following values: appId, displayName, password, and tenant.

Install Ansible: Do one of the following options:
- Install and configure Ansible on a Linux virtual machine
- Configure Azure Cloud Shell

Create an Azure key vault

Ansible needs a resource group to deploy your resources in.

Create an Ansible playbook named create_kv.yml add the following task to create a resource group:

---
- name: Create Azure key vault
  hosts: localhost
  connection: local
  tasks:

  - name: Create resource group
    azure_rm_resourcegroup:
      name: ansible-kv-test-rg
      location: eastus

Define the required variables for the tenant ID, service principal object ID, and vault name.
```
---
vars:
  tenant_id: <tenantId>
  object_id: <servicePrincipalObjectId>
  vault_name: <vaultName>
```
Replace <tenantId>, <servicePrincipalObjectId>, and <vaultName> with the appropriate values. The objectId is used to grant access to secrets within the key vault.

key point:
- Azure key vault names must be globally universally unique. The key vault and keys/secrets inside it are accessed via https://{vault-name}.vault.azure.net URI.

Configure the Azure key vault instance by adding the create_kv.yml task.

---
- name: Create key vault instance
  azure_rm_keyvault:
    resource_group: ansible-kv-test-rg
    vault_name: "{{ vault_name }}"
    enabled_for_deployment: yes
    vault_tenant: "{{ tenant_id }}"
    sku:
      name: standard
    access_policies:
      - tenant_id: "{{ tenant_id }}"
        object_id: "{{ object_id }}"
        secrets:
          - get
          - list
          - set
          - delete

Run the create_kv.yml playbook.

ansible-playbook create_kv.yml

PLAY [localhost] *******************************************************************************************************

TASK [Gathering Facts] *************************************************************************************************
ok: [localhost]

TASK [Create resource group] *******************************************************************************************
ok: [localhost]

TASK [Create key vault instance] ************************************************************************************
ok: [localhost]

PLAY RECAP *************************************************************************************************************
localhost                  : ok=3    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

Complete create Azure key vault playbook

This section lists the entire sample Ansible playbook for creating an Azure key vault.

- hosts: localhost
  connection: local

  vars:
    tenant_id: <tenantId>
    object_id: <servicePrincipalObjectId>
    vault_name: <vaultName>

  tasks:
  - name: Create resource group 
    azure_rm_resourcegroup:
      name: ansible-kv-test-rg
      location: eastus

  - name: Create instance of Key Vault
    azure_rm_keyvault:
      resource_group: ansible-kv-test-rg
      vault_name: "{{ vault_name }}"
      enabled_for_deployment: yes
      vault_tenant: "{{ tenant_id }}"
      sku:
        name: standard
      access_policies:
        - tenant_id: "{{ tenant_id }}"
          object_id: "{{ object_id }}"
          secrets:
            - get
            - list
            - set
            - delete

Create a secret in key vault

Before the secret can be created, you'll need the keyvault URI.

Create another playbook named create_kv_secret.yml. Copy the following code into the playbook:

---
- hosts: localhost
  connection: local

  tasks:

  - name: Get Key Vault by name
    azure_rm_keyvault_info:
      resource_group: ansible-kv-test-rg
      name: <vaultName>
    register: keyvault

  - name: set KeyVault uri fact
    set_fact: keyvaulturi="{{ keyvault['keyvaults'][0]['vault_uri'] }}"

  - name: Create a secret
    azure_rm_keyvaultsecret:
      secret_name: adminPassword
      secret_value: <secretValue>
      keyvault_uri: "{{ keyvaulturi }}"

Replace <vaultName> with the name of your key vault name and <secretValue> with the value for the secret.

Key point:

The azure_rm_keyvault_info and set_facts modules registers the key vault URI as a variable. That variable is then passed to the azure_rm_keyvaultsecret module to create the secret.

Run the create_kv_secret.yml playbook.

ansible-playbook create_kv_secret.yml

PLAY [localhost] *******************************************************************************************************

TASK [Gathering Facts] *************************************************************************************************
ok: [localhost]

TASK [Get Key Vault by name] *******************************************************************************************
ok: [localhost]

TASK [set KeyVault uri fact] *******************************************************************************************
ok: [localhost]

TASK [Create a secret] *************************************************************************************************
ok: [localhost]

PLAY RECAP *************************************************************************************************************
localhost                  : ok=4    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

Get secrets from key vault

Secrets stored in Azure key vault can be used to populate Ansible variables.

Create a new playbook called get_kv_secrets.yml to retrieve key vault secrets with Ansible.

Ansible 2.9 with azure_preview_modules

---
- hosts: localhost
  connection: local
  roles: 
    -  { role: azure.azure_preview_modules }

  vars:
    tenant_id: <tenantId>
    vault_name: <vaultName>
    secret_name: adminPassword
    client_id: <servicePrincipalApplicationId>
    client_secret: <servicePrincipalSecret>

  tasks:
  - name: Get Key Vault by name
    azure_rm_keyvault_info:
      resource_group: ansible-kv-test-rg
      name: "{{ vault_name }}"
    register: keyvault

  - name: Set key vault URI fact
    set_fact: keyvaulturi="{{ keyvault['keyvaults'][0]['vault_uri'] }}"

  - name: Set key vault secret fact
    set_fact: secretValue={{ lookup('azure_keyvault_secret',secret_name,vault_url=keyvaulturi, client_id=client_id, secret=client_secret, tenant_id=tenant_id) }}

  - name: Output key vault secret
    debug:
      msg: "{{ secretValue }}"

Replace <tenantId>, <vaultName>, <servicePrincipalApplicationId>, and <servicePrincipalSecret> with the appropriate values.

To learn more about azure_preview_modules, see the Ansible Galaxy page.

Ansible 2.10 with azure.azcollection

---
- hosts: localhost
  connection: local
  collections:
    - azure.azcollection

  vars:
    vault_name: ansible-kv-test-01
    secret_name: adminPassword

  tasks:

  - name: Get Key Vault by name
    azure_rm_keyvault_info:
      resource_group: ansible-kv-test-rg
      name: "{{ vault_name }}"
    register: keyvault

  - name: Set key vault URI fact
    set_fact: keyvaulturi="{{ keyvault['keyvaults'][0]['vault_uri'] }}"

  - name: Get secret value
    azure_rm_keyvaultsecret_info:
      vault_uri: "{{ keyvaulturi }}"
      name: "{{ secret_name }}"
    register: kvSecret

  - name: set secret fact
    set_fact: secretValue="{{ kvSecret['secrets'][0]['secret'] }}"

  - name: Output key vault secret
    debug: 
      msg="{{ secretValue }}"

Replace <vaultName> with the appropriate value.

To learn more about azcollection, see Ansible collection for Azure.

Run the get-secret-value.yml playbook.

ansible-playbook get-secret-value.yml

TASK [Output key vault secret] *************************************************
ok: [localhost] => {
    "msg": "<plainTextPassword>"
}

Confirm the output that replaced <plainTextPassword> is the plain text value of the secret previously created in Azure key vault.

Complete sample Ansible playbook

This section lists the entire sample Ansible playbook for configuring an Azure Windows VM using a key vault secret.

---
- name: Create Azure VM
  hosts: localhost
  connection: local
  gather_facts: false
  collections:
    - azure.azcollection

  vars:
    vault_uri: <key_vault_uri>
    secret_name: <key_vault_secret_name>

  tasks:

  - name: Get latest version of a secret
    azure_rm_keyvaultsecret_info:
      vault_uri: "{{ vault_uri }}"
      name: "{{ secret_name }}"
    register: kvSecret

  - name: Set secret fact
    set_fact: secret_value="{{ kvSecret['secrets'][0]['secret'] }}"

  - name: Create resource group
    azure_rm_resourcegroup:
      name: myResourceGroup
      location: eastus

  - name: Create virtual network
    azure_rm_virtualnetwork:
      resource_group: myResourceGroup
      name: vNet
      address_prefixes: "10.0.0.0/16"

  - name: Add subnet
    azure_rm_subnet:
      resource_group: myResourceGroup
      name: subnet
      address_prefix: "10.0.1.0/24"
      virtual_network: vNet

  - name: Create public IP address
    azure_rm_publicipaddress:
      resource_group: myResourceGroup
      allocation_method: Static
      name: pip
    register: output_ip_address

  - name: Output public IP
    debug:
      msg: "The public IP is {{ output_ip_address.state.ip_address }}"
  
  - name: Create Network Security Group
    azure_rm_securitygroup:
      resource_group: myResourceGroup
      name: networkSecurityGroup
      rules:
        - name: 'allow_rdp'
          protocol: Tcp
          destination_port_range: 3389
          access: Allow
          priority: 1001
          direction: Inbound

  - name: Create a network interface
    azure_rm_networkinterface:
      name: nic
      resource_group: myResourceGroup
      virtual_network: vNet
      subnet_name: subnet
      security_group: networkSecurityGroup
      ip_configurations:
        - name: default
          public_ip_address_name: pip
          primary: True

  - name: Create VM
    azure_rm_virtualmachine:
      resource_group: myResourceGroup
      name: win-vm
      vm_size: Standard_DS1_v2
      admin_username: azureuser
      admin_password: "{{ secret_value }}"
      network_interfaces: nic
      os_type: Windows
      image:
          offer: WindowsServer
          publisher: MicrosoftWindowsServer
          sku: 2019-Datacenter
          version: latest
    no_log: true

Replace <key_vault_uri> and <key_vault_secret_name> with the appropriate values.

Clean up resources

Save the following code as delete_rg.yml.

---
- hosts: localhost
  tasks:
    - name: Deleting resource group - "{{ name }}"
      azure_rm_resourcegroup:
        name: "{{ name }}"
        state: absent
      register: rg
    - debug:
        var: rg

Run the playbook using the ansible-playbook command. Replace the placeholder with the name of the resource group to be deleted. All resources within the resource group will be deleted.
```
ansible-playbook delete_rg.yml --extra-vars "name=<resource_group>"
```
Key points:
- Because of the register variable and debug section of the playbook, the results display when the command finishes.

Run az group delete to delete the resource group. All resources within the resource group will be deleted.
```
az group delete --name <resource_group>
```
Verify that the resource group was deleted by using az group show.
```
az group show --name <resource_group>
```

Run Remove-AzResourceGroup to delete the resource group. All resources within the resource group will be deleted.
```
Remove-AzResourceGroup -Name <resource_group>
```
Verify that the resource group was deleted by using Get-AzResourceGroup.
```
Get-AzResourceGroup -Name <resource_group>
```

Next steps

Ansible on Azure

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