Ansible For Everyone (Ansible Playbooks) – Part 3: 100 days of Cloud: Day 34

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DAY 34- Ansible For Everyone (Ansible Playbooks) – Part 3 – Day Thirty four

100 days of Cloud on GitHub – Read On iCTPro.co.nz – Read on Dev.to

🧮 Prerequisite

Please refer to Ansible Part 1 and Part 2 for a detailed understanding.

Ansible For Everyone – Part 1 Anuvindh Sankaravilasam for AWS Community Builders

Ansible For Everyone(Practical) – Part 2 Anuvindh Sankaravilasam for AWS Community Builders

🛠️ Adding Ansible inventory

Lets add our cluster of servers to Ansible infrastucture
In this demo i will be only using AnsibleSlaves-YourProdServer as my prod server.

Goto your Ansible-Control-Center and update ansible hosts file

sudo nano /etc/ansible/hosts

In this file you will find templetes to add hosts
lets add our production group of servers
- Add [YourgGroupName]
- next line , give a name to server which you are going to add. Lets name app1 then ansible_ssh_host= your ip address of your slave.

[production]
app1 ansible_ssh_host= ipaddress of your slave

Let’s test the connections

To test all connections

ansible -m ping all

To test all connections in a group

ansible -m ping production

To test connection of a server named app1 in a group

ansible -m ping app1

Below image shows the result of the ping

✨ Modules

Modules are the commands which help to perform task,in other words modules are kind of library that help to perform tasks.
List of all modules – link

What are Tasks?
A set of instructions performed with modules.

▶️ Ansible Playbooks

Playbooks are written in YAML also Playbooks are lists of tasks that automatically execute against hosts.

Let’s create an Nginx playbook
ansible modules – https://docs.ansible.com/ansible/2.9/modules/list_of_all_modules.html

lets create a YAML file

sudo nano nginxplaybook.yaml

YAML scripting starts with three dashes ---
then you can give a name with start a single dash -
now we will update the next parameter which is our hosts, in this case it will be production if you wanna do for all servers use all
so if we need to run as root on targets, we will be setting become parameter to true.
define task now under task
- we will be using a apt module to install nginx. Reference link
- We have given aname to the task as install nginx.Then will be using apt module as we are using ubuntu.
- name of the module and state, refer the link for detailed understanding.

---
- name: install nginx server
  hosts: production
  become: yes
  tasks:
  - name: install nginx
    apt:
      name: nginx
      state: latest

Now lets run the playbook

Before running the playbook lets check it. ansible-playbook nginxplaybook.yaml --check
Now lets run the play book

ansible-playbook nginxplaybook.yaml

Deploy code from git

Here we will deploy a website to the target server using Ansible.

---
- name: install nginx server
  hosts: production
  become: yes
  tasks:
  - name: install nginx
    apt:
      name: nginx
      state: latest
  - name: Clone a repo with separate git directory
    ansible.builtin.git:
      repo: https://github.com/anuvindhs/CLOUD-is-AWSome.git
      dest: /var/www/html/app1