DevOps Use Docker to hands-on Ansible

Introduction

In this tutorial, I demonstrate how to use Docker for hands-on Ansible automation. Learn how to leverage Docker in a DevOps workflow and streamline configuration management with Ansible. A practical guide for DevOps professionals and beginners.

DevOps Use Docker

My Laptop Setup:

• Operating System: Windows 10
• Tools: Docker and Docker Compose

By using Docker to create one Ansible container and Server01 and Server02 containers. From Ansible command is executed in Ansible container to Two target container.

Let go use Docker to hands-on Ansible

Directory Structure

├── Docker
│   ├── Ansible_Control_node
│   │   └── Dockerfile      
│   └── Target_Server
│       └── Dockerfile      
├── docker-compose.yml      
├── hosts            
└── playbook.yml

Explain File and Directory Structure

I will not explain it to Docker because it is out of this post. The basic file of Ansible.

1. hosts the file describes the target server running
2. playbook.yml the file I will create a new file is devopsroles.txt for two targets.

The content of files as below

docker-compose.yml file

version: '3'
services:
  ansible:
    container_name: ansible
    build: ./Ansible_Control_node
    tty: true
    working_dir: "/var/data"
    volumes:
      - .:/var/data

  server01:
    container_name: server01
    build: ./Target_Server
    tty: true
  server02:
    container_name: server02
    build: ./Target_Server
    tty: true

playbook.yml file

- hosts: target
  tasks:
  - name: "Create new file devopsroles.txt"
    shell: |
        touch devopsroles.txt

hosts file

[target]
server01
server02

Ansible_Control_node/Dockerfile file

FROM centos
ENV ANSIBLE_HOST_KEY_CHECKING False
RUN yum install epel-release -y && \
    yum update -y && \
        yum install -y openssh-server openssh-clients net-tools && \
    yum install -y ansible
CMD /bin/bash

Target_Server/Dockerfile file

# Centos image latest
FROM centos:latest

# Install OpenSSh server with yum
RUN yum -y install openssh-server openssh-clients

# Created because public key is required when starting sshd
RUN ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
RUN ssh-keygen -f /etc/ssh/ssh_host_ecdsa_key -N '' -t ecdsa

# Allow login as root
RUN sed -ri 's/^#PermitEmptyPasswords no/PermitEmptyPasswords yes/' /etc/ssh/sshd_config

# Specify root password
RUN echo "root:" | chpasswd

EXPOSE 22

# Start sshd
CMD ["/usr/sbin/sshd", "-D"]

Start Ansible and two target containers.

docker-compose up -d

Connect to Ansible container

docker exec -it ansible /bin/bash

SSH connection without password from Ansible container to Two target container.

	ssh server01
	exit
	ssh server02
	exit

Run the Ansible command.

ansible-playbook -i hosts playbook.yml

Execution result of Ansible

Link Youtube

Conclusion

Using Docker with Ansible in DevOps simplifies automation and improves efficiency. By integrating these powerful tools, you can streamline your deployment and configuration management processes. Thank you for visiting the DevOpsRoles.com page.