How to Find IP address assigned to each interface on Linux Using Ansible

ansible

I am working to write playbook which should collect the basic server information before performing any task, I want to collect Interfacename/IP address/Netmask assigned to each interface.

Example – I have two interface – eth0 & eth1 and both are configured with different IP.

I using ansible facts to collect these info, It is working fine with single interface but the information losses the order if there are more interface on a a machine. I want to loop through each interface and collect these information but unable to get in order.

  Network_Info : Interface Name : {{ ansible_default_ipv4['alias'] }}
  Network_Info : IP Address     : {{ ansible_default_ipv4['address'] }}
  Network_Info : Netmask        : {{ ansible_default_ipv4['netmask']}}

Can some one please help me with this.

Thanks
Kamlesh

Best Answer

Give it a try. The ansible_interfaces fact contains this information.

tasks:
  - name: debug interface facts
    debug:
      msg: "{{ hostvars[inventory_hostname]['ansible_%s' | format(item)] }}"
    loop: "{{ ansible_interfaces }}"

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The ansible_interfaces fact lists all of the existing network interfaces.

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That won't work, because:

Within any section, redefining a var will overwrite the previous instance. If multiple groups have the same variable, the last one loaded wins. If you define a variable twice in a play’s vars: section, the 2nd one wins.

Ansible doc: playbooks_variables

In my understanding of the documentation app_user under group_vars/app2/vars.yml should overwrite app_user under group_vars/app1/vars.yml.

What should work would be to call each hostgroup in a separate play:

---
- hosts: app1
  tasks:
  - name: Copy config
    become: true
    become_user: {{ app_user }}
    template: ....

- hosts: app2
  tasks:
  - name: Copy config
    become: true
    become_user: {{ app_user }}
    template: ....

Also:

It is not necessary or a good practise to use becom_user for a template task. Use the template module like this:

---
- hosts: app1
  tasks:
  - name: Copy config
    template:
      src: template.j2
      dest: /some/remote/path
      owner: "{{ app_user }}"
      group: "{{ app_user }}"
      mode: 0755

Best Answer

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