Red Hat Ansible for Network Automation

Create a playbook named rename-spine01.yml. Use os_config statements in the playbook to change the local host name of spine01 on the network device to spineA1. Do not forget to use the os_config module that matches the device. Include a task that backs up the original configuration before the change is applied.

[student@workstation proj]$ cat rename-spine01.yml
---
- name: Lab 5, spine01 => spineA1
  hosts: spine01
  vars:
    new_hostname: spineA1

  tasks:

  - name: change the hostname
    vyos_config:
      backup: yes
      lines: set system host-name {{ new_hostname }}

Perform the play in the rename-spine01.yml playbook.

[student@workstation proj]$ ansible-playbook rename-spine01.yml

Execute an ad hoc command to confirm that the host name of spine01 is now spineA1. Also verify that the original device configuration was backed up.

[student@workstation proj]$ ansible -m vyos_command \
> -a "commands='sh host name'" spine01
spine01 | SUCCESS => {
    "changed": false,
    "stdout": [
        "spineA1"
    ],
    "stdout_lines": [
        [
            "spineA1"
        ]
    ]
}

Execute an ad hoc command to change the host name back to spine01.

[student@workstation proj]$ ansible -m vyos_config \
> -a "lines='set system host-name spine01'" spine01

Create a directory named config/.

[student@workstation proj]$ mkdir config

Create a static configuration file named config/spine02.cfg. Put in this file this VyOS configuration statement that sets the host name to spineB2: set system host-name spineB2.

[student@workstation proj]$ cat config/spine02.cfg
set system host-name spineB2

Create a playbook named rename-spine02.yml. Include in this playbook a task that sources configuration statements from the config/spine02.cfg file.

[student@workstation proj]$ cat rename-spine02.yml
---
- name: Lab 5, spine02 => spineB2
  hosts: spine02
  vars:
    config_filepath: ./config

  tasks:

  - name: change the hostname
    vyos_config:
      src: "{{ config_filepath }}/{{ inventory_hostname }}.cfg"
      backup: yes

Perform the play in the rename-spine02.yml playbook. If you receive an error regarding the file path, make sure you have placed spine02.cfg into the coding directory.

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

Execute an ad hoc command to confirm that the host name of spine02 is now spineB2.

[student@workstation proj]$ ansible -m vyos_command \
> -a "commands='sh host name'" spine02

Execute an ad hoc command to change the host name back to spine02.

[student@workstation proj]$ ansible -m vyos_config \
> -a "lines='set system host-name spine02'" spine02

Create the file host_vars/cs01/vars.yml if it does not already exist. Add a YAML mapping to the host_vars/cs01/vars.yml file that maps the variable name new_hostname to the value csA1.

[student@workstation proj]$ cat host_vars/cs01/vars.yml
new_hostname: csA1

Create a Jinja2 template named ios-cs-hostname.j2 that consists of the IOS command to set the host name. When setting the host name with Ansible, it makes sense to use the Ansible magic variable inventory_hostname, but for the purpose of this exercise, use the variable new_hostname instead. The IOS command to set the host name is hostname hostname.

[student@workstation proj]$ cat j2/ios-cs-hostname.j2
hostname {{ new_hostname }}

Create a playbook named rename-cs01.yml. The play in this playbook should contain a task that uses the ios_config module, in which the lines used by ios_config are sourced from the ios-cs-hostname.j2 template.

[student@workstation proj]$ cat rename-cs01.yml
---
- name: a play that uses a Jinja2 template and host vars to rename cs01
  hosts: cs01

  tasks:

  - name: configure host
    ios_config:
      src: j2/ios-cs-hostname.j2

Perform the play in the rename-cs01.yml playbook.

[student@workstation proj]$ ansible-playbook rename-cs01.yml

Execute an ad hoc command and confirm that the host name of cs01 is now csA1.

[student@workstation proj]$ ansible -m ios_command \
> -a "commands='sh run | include hostname'" cs01
cs01 | SUCCESS => {
    "changed": false,
    "stdout": [
        "hostname csA1"
    ],
    "stdout_lines": [
        [
            "hostname csA1"
        ]
    ]
}

Execute an ad hoc command to change the host name back to cs01.

[student@workstation proj]$ ansible -m ios_config -a "lines='hostname cs01'" cs01