Red Hat Ansible for Network Automation

Execute an ad hoc command that displays the host name of VyOS device spine02.

[student@workstation proj]$ ansible -m vyos_command \
> -a "commands='sh host name'" spine02
spine02 | SUCCESS => {
    "changed": false,
    "stdout": [
        "vyos"
    ],
    "stdout_lines": [
        [
            "vyos"
        ]
    ]
}

Add a variable and its value to support template-based configuration.

1. Create the host_vars/spine02/ directory if it does not already exist.

   [student@workstation proj]$ mkdir -p host_vars/spine02

2. Create a host variables file named host_vars/spine02/vars.yml. This file should set a variable named new_hostname to the value spineX1.

   [student@workstation proj]$ cat host_vars/spine02/vars.yml
   new_hostname: spineX1

Create a Jinja2 template that builds configuration statements.

1. Create a templates directory named j2/ if one does not already exist.

   [student@workstation proj]$ mkdir -p j2

2. Create a Jinja2 template file named j2/vyos-configure.j2. This file should map variables to configuration statements.

   [student@workstation proj]$ cat j2/vyos-configure.j2
   set system host-name {{ new_hostname }}

Perform a play that configures a device from a Jinja2 template.

1. Compose a playbook named j2cfg-spine02.yml. It should contain a single task that uses the vyos_config module. It should source the configuration lines used by vyos_config from your Jinja2 template.

   [student@workstation proj]$ cat j2cfg-spine02.yml
   ---
   - name: play that configures spine02 using j2 template
     hosts: spine02
     vars:
       j2_template: j2/vyos-configure.j2
   
     tasks:
   
     - name: configure {{ inventory_hostname }}
       vyos_config:
         src: "{{ j2_template }}"

2. Check the new playbook's syntax.

   [student@workstation proj]$ ansible-playbook --syntax-check j2cfg-spine02.yml

3. Perform the play in j2cfg-spine02.yml.

   [student@workstation proj]$ ansible-playbook j2cfg-spine02.yml

Confirm that the change occurred as desired, then change the host name to its original value.

1. Execute an ad hoc command to confirm that the change occurred as expected.

   [student@workstation proj]$ ansible -m vyos_command \
   > -a "commands='sh host name'" spine02
   spine02 | SUCCESS => {
       "changed": false,
       "stdout": [
           "spineX1"
       ],
       "stdout_lines": [
           [
               "spineX1"
           ]
       ]
   }

2. Execute an ad hoc command to change the host name to its original value.

   [student@workstation proj]$ ansible -m vyos_system -a "host_name=vyos" spine02
   spine02 | SUCCESS => {
       "changed": true,
       "commands": [
           "set system host-name 'vyos'"
       ]
   }