Creating an Ansible playbook that will retrieve newly launched container IP and update the inventory.

This is the continuation of Task 10 I have implemented before. Check out the link below if you haven't

In the previous Task 10, we implemented the docker setup into the remote system using Ansible. And now in this task, we will write an Ansible script to retrieve the IP of the launched docker container so that we can use that container to build infrastructure using the Ansible

Let's get started

Firstly we will create an ansible-playbook and copy the below code

- hosts: localhost
  vars_prompt:
       - name: docker_name
         prompt: Enter the name of docker container- 


  tasks:
       - name: start docker service
         service:
              name: docker
              
       - name: Pulling httpd image
         docker_image:
              name: "httpd"
              source: pull
              
       - name: Launch container with given name
         docker_container:
              name: "{{ docker_name }}"
              image: "httpd"
              state: started
              volumes: "/var/www/html/:/usr/local/apache2/htdocs"
              
       - name: docker container info
         docker_container_info:
             name: "{{docker_name }}"
         register: result


       - debug:
              var : result.container.NetworkSettings.IPAddress


       - name: Updating inventory file
         blockinfile:
              block: |
                     [dockerip]
                     {{  result.container.NetworkSettings.IPAddress }} ansible_user=root ansible_connection=ssh

              
              path: "/hosts.txt"

In the above file, the last block of code will update the IP of the container in the inventory file used by the ansible

As we can see the debug section output that we have successfully retrieved the IP of the container