Using ansible to modify ip address on system

[Gerald Spencer]

Okay, we've ran out of ip addresses, and got a larger subnet from our ip. I am currently in the process of switching them over, and decided it would be nice to do this with ansible, but I have ran into a little snag. 

Currently I have:

    - shell: "ifconfig | grep -B1 {{ old_address }}| grep -E '^(\\w+)[[:space:]]' | sed 's/\\s.*$//'"

      args:

        executable: /bin/bash

      register: network_interface

    - template:

        src: files/linux_network_interfaces.j2

        dest: /etc/network/interfaces

        owner: root

        group: root

        mode: '0644'

      become: true

      when: item.key == inventory_hostname

      with_dict: "{{ new_addresses }}"

    - shell: "ifdown {{ network_interface.stdout }} && ifup {{ network_interface.stdout }}"

      args:

        executable: /bin/bash

      become: true

But it hangs in the last shell task... since the IP address was changed. 

Is there a way I can tell this task to just run, then use set_fact to modify each host to its new IP to ping and make sure it worked, then I'll move forward and modify our DNS records to match the new hosts..

[Gerald Spencer]

Solved it via running the command as "fire and forget" with async and pool, using a bash command in the background. Then modifying the ansible_ssh_host to the new IP address, and waiting for it port 22 to come up on that host.

    - name: Grab the network interface that the old IP is using and store it.

      shell: "ifconfig | grep -B1 {{ old_address_start }}| grep -E '^(\\w+)[[:space:]]' | sed 's/\\s.*$//'"

      args:

        executable: /bin/bash

      register: network_interface

    - name: Pushout new /etc/network/interface to hosts

      template:

        src: files/linux_network_interfaces.j2

        dest: /etc/network/interfaces

        owner: root

        group: root

        mode: '0644'

      become: true

      when: item.key == inventory_hostname

      with_dict: "{{ new_addresses }}"

    - name: Reload the hosts' network interface

      shell: "(sleep 1; ifdown {{ network_interface.stdout }} && ifup {{ network_interface.stdout }}) &"

      args:

        executable: /bin/bash

      become: true

      async: 100

      poll: 0

    

    - name: Change ansible's ip address for each host

      set_fact:

        ansible_ssh_host: "{{ item.value.address }}"

      when: item.key == inventory_hostname

      with_dict: "{{ new_addresses }}"

    - name: Wait for the hosts' network interface to come back up

      local_action:

        module: wait_for

        host: "{{ ansible_ssh_host }}"

        port: 22

        delay: 10

        state: started

      register: wait_result

    - name: Modify all of the route53 records for ip changes that succeeded

      local_action:

        module: route53

        command: create

        zone: xxxxx

        record: "{{ item.key }}"

        type: A

        value: "{{ item.value.address }}"

        overwrite: true 

      when: item.key == inventory_hostname and wait_result|succeeded

      with_dict: "{{ new_addresses }}"

[Michael Lee]

Hi, I was wondering if you could provide us with the j2 template for your network interface?  If not, what are the basics that you used for it?

Thank you!