junos_install_config - Is it possible to get a diff without committing?

[erezed]

Hi,

I'm currently using napalm_install_config but I'd like to switch to the Juniper one since it offers more features. However, with the napalm installation module I have the option to receive a diff without committing the configuration. Is this option available within junos_install_config or do I have to cobble something together? 

Thanks,

[Stacy Smith]

On Wednesday, September 13, 2017 at 2:29:23 PM UTC-6, erezed wrote:

I'm currently using napalm_install_config but I'd like to switch to the Juniper one since it offers more features. However, with the napalm installation module I have the option to receive a diff without committing the configuration. Is this option available within junos_install_config or do I have to cobble something together?

If you use junos_install_config in check mode, it will load the configuration and produce a diff (assuming diffs_file is set), but it will not commit the config. If you are using Ansible >= 2.2, then you can specify check_mode: yes on the junos_install_config task without having to enable check mode for the entire playbook. See this link for more info.

Here's a playbook which produces a small config change (set system host-name current_host_name.foo) using a Jinja2 template. It then loads the config change and produces a diff (but doesn't commit). It then loads the diff file into an Ansible variable and prints the result. Again, the main key is simply check_mode: yes on the junos_install_config task.

---

# This playbook requires Ansible >= 2.2.

- name: "Demonstrate diff from junos_install_config without commit"

  hosts: junos-all

  connection: local

  gather_facts: no

  roles:

    - Juniper.junos

  tasks:

    - name: "Cleanup the ./output directory"

      file:

        path: "./output"

        state: absent

      run_once: True

      delegate_to: localhost

    - name: "Create the ./output directory"

      file:

        path: "./output"

        state: directory

      run_once: True

      delegate_to: localhost

    - name: "Verify the ./input directory exists"

      file:

        path: "./input"

        state: directory

      run_once: True

      delegate_to: localhost

    - name: "Verify the template exists"

      file:

        path: "./input/template-host-name.j2"

        state: file

      run_once: True

      delegate_to: localhost

    - name: "Build configuration files from template"

      template:

        src: "./input/template-host-name.j2"

        dest: "./input/{{ inventory_hostname }}-host-name.conf"

    - name: "Produce config diff"

      junos_install_config:

        host: "{{ inventory_hostname }}"

        user: "{{ jaccess.user }}"

        passwd: "{{ jaccess.passwd }}"

        file: "./input/{{ inventory_hostname }}-host-name.conf"

        diffs_file: "./output/{{ inventory_hostname }}-host-name.diff"

      check_mode: yes

      register: response

    - name: "Cleanup the config file"

      file:

        path: "./input/{{ inventory_hostname }}-host-name.conf"

        state: absent

    - name: "Read diff file into diffs variable"

      set_fact:

        diffs: "{{ lookup('file','./output/{{ inventory_hostname }}-host-name.diff') }}"

    - name: "Print diffs"

      debug:

        var: diffs

    - name: "Cleanup the ./output directory"

      file:

        path: "./output"

        state: absent

      run_once: True

      delegate_to: localhost