The common variables are stored in the files in the directory
defaults/main. These variables can be customized in the file
vars/main.yml. The file
vars/main.yml will be preserved by the
update of the role.
Don’t make any changes to the files in the directory defaults/main. The changes might be overwritten when the role is updated. Customize the default values in the file vars/main.yml.
The examples of the customization in the directory