debug 輸出 magic 變數

1. debug 模組列印變數 groups，內容由 inventory 設定取得。

   [deyu1@kvm19 ansible]$ ansible -m debug dev -a "var=groups"
   kvm11 | SUCCESS => {
       "groups": {
           "all": [
               "kvm11",
               "kvm12",
               "kvm15",
               "kvm13",
               "kvm14"
           ],
           "balancers": [
               "kvm15"
           ],
           "dev": [
               "kvm11"
           ],
           "prod": [
               "kvm13",
               "kvm14"
           ],
           "test": [
               "kvm12"
           ],
           "ungrouped": [],
           "webservers": [
               "kvm13",
               "kvm14"
           ]
       }
   }
   

2. debug 模組列印變數 group_names，內容由 inventory 設定取得。

   [deyu1@kvm19 ansible]$ ansible -m debug all -a "var=group_names"
   kvm11 | SUCCESS => {
       "group_names": [
           "dev"
       ]
   }
   kvm12 | SUCCESS => {
       "group_names": [
           "test"
       ]
   }
   kvm15 | SUCCESS => {
       "group_names": [
           "balancers"
       ]
   }
   kvm13 | SUCCESS => {
       "group_names": [
           "prod",
           "webservers"
       ]
   }
   kvm14 | SUCCESS => {
       "group_names": [
           "prod",
           "webservers"
       ]
   }
   

3. debug 模組列印變數 hostvars['kvm11']，ansbile_facts 是空的，因為 debug 模組沒有執行 setup 模組。

   [deyu1@kvm19 ansible]$ ansible -m debug dev -a "var=hostvars['kvm11']"
   kvm11 | SUCCESS => {
       "hostvars['kvm11']": {
           "ansible_check_mode": false,
           "ansible_diff_mode": false,
           "ansible_facts": {},
           "ansible_forks": 5,
           "ansible_inventory_sources": [
               "/home/deyu1/ansible/inventory"
           ],
           "ansible_playbook_python": "/usr/libexec/platform-python",
           "ansible_ssh_host": "192.168.122.11",
           "ansible_verbosity": 0,
           "ansible_version": {
               "full": "2.8.5",
               "major": 2,
               "minor": 8,
               "revision": 5,
               "string": "2.8.5"
           },
           "group_names": [
               "dev"
           ],
           "groups": {
               "all": [
                   "kvm11",
                   "kvm12",
                   "kvm15",
                   "kvm13",
                   "kvm14"
               ],
               "balancers": [
                   "kvm15"
               ],
               "dev": [
                   "kvm11"
               ],
               "prod": [
                   "kvm13",
                   "kvm14"
               ],
               "test": [
                   "kvm12"
               ],
               "ungrouped": [],
               "webservers": [
                   "kvm13",
                   "kvm14"
               ]
           },
           "inventory_dir": "/home/deyu1/ansible",
           "inventory_file": "/home/deyu1/ansible/inventory",
           "inventory_hostname": "kvm11",
           "inventory_hostname_short": "kvm11",
           "omit": "__omit_place_holder__354579cf702a43d1da4b8c98248aa4acbce888dc",
           "playbook_dir": "/home/deyu1/ansible"
       }
   }