execute sensible-playbook command

 ansible-playbook -i prod playbooks/ganotify.yml -u lidong.he -l ba3.prod.aws

• -I 指定inventory
• -u connect as this user
• -l only execute playbook in the selected hosts which in the inventory

string and var concat

inventory_dir + '/beta'

print var value

- name: Print ansible_nodename
  debug:
    msg: "{{ansible_nodename}}  aa {{ gafly_celery_host }}"

语法

• 如果 my_hosts 没定义返回{}

{{ my_hosts | default({}) }}

• groups inventory的所有组
• groups['all'] 所有组的变量并集