Ansible is a powerful automation tool that can be used to automate the installation and setup of software, including Docker. To use Ansible to install and set up Docker on a CentOS 7 system, you can use the following steps:

  1. Create an Ansible playbook with the following tasks:
- name: Install Docker
  yum:
    name: docker
    state: latest

- name: Start and Enable Docker
  service:
    name: docker
    state: started
    enabled: yes

  1. Make sure Ansible can connect to the target system, by setting up the correct SSH key-based authentication or adding the host to your Ansible inventory file.

  2. Run the playbook by using the ansible-playbook command, specifying the target system and the playbook file:

ansible-playbook -i "centos7.example.com," playbook.yml
  1. To check if docker is installed and running, use the following command
ansible centos7.example.com -m shell -a "docker version"
  1. To check if the ansible has added the user to the docker group or not
ansible centos7.example.com -m shell -a "id <username>"

With this playbook, Ansible will install the latest version of Docker on the target system, start the Docker service, and enable it to start automatically at boot time. You can add more tasks or customize the playbook to suit your specific needs.

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