How to pass variables via command line?

You can pass variables to an Ansible playbook via the command line using the -e or --extra-vars option. This allows you to define variables at runtime. Here’s how to do it:

1. Passing a Single Variable:
   You can pass a single variable like this:

   ansible-playbook my-playbook.yml -e "http_port=80"

2. Passing Multiple Variables:
   You can pass multiple variables by separating them with spaces:

   ansible-playbook my-playbook.yml -e "http_port=80 db_port=3306"

3. Passing Variables as a JSON String:
   You can also pass variables in JSON format:

   ansible-playbook my-playbook.yml -e '{"http_port": 80, "db_port": 3306}'

4. Using a Variable File:
   If you have a file containing variables, you can include it using the @ symbol:

   ansible-playbook my-playbook.yml -e @vars.yml

5. Combining Methods:
   You can combine command line variables with variable files:

   ansible-playbook my-playbook.yml -e @vars.yml -e "http_port=80"

Using these methods, you can dynamically set variables for your Ansible playbooks when executing them from the command line.