Configure docker and launch container using ansible

In this post, i have created automation using ansible . I have created playbook for configure docker engine and launch new container.

Ansible: Ansible is an open source software , which is used in automation . Ansible is used in provisioning , configuration management , Application deployment , continuous delivery, security automation, orchestration.

In ansible two methods can be used to complete any in target node.

1. Ad-hoc and 2. Playbook

Ad-hoc is nothing but command which is used to do job according to user .

Ansible supports YAML language , YAML language is used to create playbook for automation.

For install ansible use below command:

#In Linux OS
pip3 install ansible 

Ansible is an agentless software , in ansible controller node manage target node using SSH protocol . For this first of it is necessary to decide manage node in controller node . For configure target node inventory file is created .

For configure ansible edit file “/etc/ansible/ansible.cfg”

In this file it have to mention the inventory file and edit this file according to below

[defaults]
inventory=<inventory_file_path>
host_key_checking = false
role_path=<role_path_name>

Edit inventory file as below

After doing all setup create playbook for configure docker

ansible-playbook

- hosts: myweb
tasks:
  - command: "ls -l /dvd"
    register: x
    ignore_errors: yes
  - file:
      state: directory
      path: "/dvd"
    when: x.rc != 0
  - mount:
     src: "/dev/cdrom"
     path: "/dvd"
     state: mounted
     fstype: "iso9660"
  - yum_repository:
      name: "docker"
      description: "docker repo  for  package"
      baseurl:
"https://download.docker.com/linux/centos/7/x86_64/stable/"
      gpgcheck: no
  - command: "rpm -q docker-ce"
    register: y
    ignore_errors: yes
  - command: "yum install docker-ce --nobest  -y"
    when: y.rc != 0
  - command: "systemctl status docker"
    register: docker_status
    ignore_errors: yes
  - command: "systemctl start docker"
    when: docker_status.rc != 0
  - command: "systemctl enable docker"
    when: docker_status.rc != 0
  - pip:
      name: "docker-py"
  - docker_container:
      name: "mycontainer"
      state: started
      image: httpd
      restart: yes
      ports:
      - "1235:80"
       volumes:
      - /mywebdata:/usr/local/apache2/htdocs/
    register: c
  - template:
      dest: "/mywebdata"
      src: "index.html"
  - firewalld:
      masquerade: yes
      state: enabled
      permanent: yes
      immediate: yes

After creating playbook run below cmd to do all tasks in target

ansible-playbook docker.yml

when playbook is run then task is done on those target node which is power on and there is connection setup between controller node and target node.