ansible-playbook: add extra-vars examples (#1587)

pages/common/ansible-playbook.md

@@ -9,3 +9,11 @@
 - Run tasks in playbook with custom host inventory:
 
 `ansible-playbook {{playbook}} -i {{inventory_file}}`
+
+- Run tasks in playbook with extra variables defined via the command line:
+
+`ansible-playbook {{playbook}} -e "{{variable1}}={{value1}} {{variable2}}={{value2}}"`
+
+- Run tasks in playbook with extra variables defined in a json file:
+
+`ansible-playbook {{playbook}} -e "@{{variables.json}}"`