Ansible deployments

Step 1: Install Ansible on the Control Machine

The first step is to install Ansible on the machine that will run the playbook. This machine is known as the control machine. You can install Ansible using the following commands:

sudo apt update
sudo apt install software-properties-common
sudo apt-add-repository --yes --update ppa:ansible/ansible
sudo apt install ansible

These commands update the package index, install the necessary packages, add the Ansible repository to the sources, and finally install Ansible.

Step 2: Create the Playbook for Deployment

Once you have Ansible installed, you can create the playbook for deploying your Docker application. The playbook will install Docker, pull the Docker image, and start the Docker container.

Here’s an example playbook to get you started:

---
- name: Deploy Docker application
  hosts: <host-group-name>
  become: yes
  vars_files:
    - variables.yml

  tasks:
    - name: Install Docker
      apt:
        name: docker.io
        state: present

    - name: Pull Docker image
      docker_image:
        name: "{{ image_name }}"
        source: "{{ image_source }}"

    - name: Start Docker container
      docker_container:
        name: "{{ container_name }}"
        image: "{{ image_name }}"
        ports:
          - "{{ host_port }}:{{ container_port }}"
        state: started

Make sure to replace the placeholders <host-group-name> with the appropriate host group name for your deployment.

Step 3: Store Variables in a Separate File

As mentioned earlier, you can store the variables in a separate file. This makes your playbook more organized and easier to maintain.

Here’s an example of the variables file:

image_name: <image-name>
image_source: <image-source>
container_name: <container-name>
host_port: <host-port>
container_port: <container-port>

Make sure to replace the placeholders <image-name>, <image-source>, <container-name>, <host-port>, and <container-port> with the appropriate values for your deployment.

Step 4: Run the Playbook

Finally, run the playbook with the following command:

ansible-playbook <playbook-name>.yml

And that’s it! Your Docker application should now be deployed on your Ubuntu system using Ansible.

In conclusion, deploying a Docker application using Ansible on Ubuntu is a straightforward process. By using Ansible, you can automate the deployment process and ensure that your application is deployed consistently and reliably across multiple systems.