Note_Tech

All technological notes.

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Ansible - Templating

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• Ansible - Templating
  • Templating

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Templating

• templating

  • dynamically generating text files (like configuration files, scripts, or YAML/JSON) using variables, conditionals, and loops.

• Ansible uses the Jinja2 templating engine (same as in Flask/Django) to achieve this.

  • extension: .j2

• Example

• nginx.conf.j2

server {
    listen 80;
    server_name ;

    location / {
        proxy_pass http://:;
    }
}

• playbook.yaml

- hosts: webservers
  vars:
    server_name: mysite.com
    backend_host: 127.0.0.1
    backend_port: 5000

  tasks:
    - name: Deploy nginx configuration
      template:
        src: templates/nginx.conf.j2
        dest: /etc/nginx/nginx.conf
      notify: Restart nginx

• Jinja2 Features

# Variable substitution
Hello 

# Default values:


# Conditionals:

DEBUG = True


# Loops:


# Filters
hello   # Output: HELLO
 # Join list into a string

• Ansible fileter

/etc/hosts    # hosts
c:\windows\hosts    # hosts, in windows
c:\windows\hosts    # ["c:","\windows\hosts"]
    # "c:"