Mastering Python Networking

The when clause

The when clause is useful when you need to check the output from the result and act accordingly. Let's look at a simple example of its usage in chapter5_1.yml:

    ---    - name: IOS Command Output      hosts: "iosv-devices"      gather_facts: false      connection: local      vars:        cli:          host: "{{ ansible_host }}"          username: "{{ username }}"          password: "{{ password }}"          transport: cli      tasks:        - name: show hostname          ios_command:            commands:              - show run | i hostname                provider: "{{ cli }}"            register: output        - name: show output          when: '"iosv-2" in "{{ output.stdout }}"'          debug:            msg: '{{ output }}'

We have seen all the elements in this playbook before in Chapter 4, Python Automation Framework – Ansible Basics; the only difference is on the second task, as we are using ...