Facts 變數查詢

1. ansible 使用 setup 模組可以列出 ansible_facts 變數，增加 filter=.. 參數可以過濾變數。

   [deyu1@kvm19 ansible]$ ansible dev -m setup -a "filter=ansible_hostname"
   kvm11 | SUCCESS => {
       "ansible_facts": {
           "ansible_hostname": "kvm11",
           "discovered_interpreter_python": "/usr/libexec/platform-python"
       },
       "changed": false
   }
   

2. 如果不知變數完整名稱，可列出所有 ansible_facts 變數，使用管線處理過濾字串，例如：memory，得知總記憶體大小的變數為 ansible_memory_mb.real.total。

   [deyu1@kvm19 ansible]$ ansible dev -m setup | grep memory -A16
           "ansible_memory_mb": {
               "nocache": {
                   "free": 1589,
                   "used": 240
               },
               "real": {
                   "free": 1341,
                   "total": 1829,
                   "used": 488
               },
               "swap": {
                   "cached": 0,
                   "free": 123,
                   "total": 123,
                   "used": 0
               }
           },
   

3. 總記憶體大小有另一變數 ansible_memtotal_mb。

   [deyu1@kvm19 ansible]$ ansible dev -m setup -a "filter=ansible_memtotal_mb"
   kvm11 | SUCCESS => {
       "ansible_facts": {
           "ansible_memtotal_mb": 1829,
           "discovered_interpreter_python": "/usr/libexec/platform-python"
       },
       "changed": false
   }
   

4. 列出所有 ansible_facts 變數，使用管線處理過濾字串 bios，得知 bios 版本變數為 ansible_bios_version。

   [deyu1@kvm19 ansible]$ ansible dev -m setup | grep bios
           "ansible_bios_date": "01/01/2007",
           "ansible_bios_version": "0.5.1",
   

5. 如果變數內容太多，管線處理過濾字串不好判斷，可先將整個 ansible_facgts 變數存檔再查。

   [deyu1@kvm19 ansible]$ ansible dev -m setup > setup.txt
   

6. 例如 ansible_devices 變數有很多資料，vda 大小變數為 ansible_devices.vda.size。

   [deyu1@kvm19 ansible]$ grep ansible_devices setup.txt -A160
           "ansible_devices": {
               "dm-0": {
                   "holders": [],
                   "host": "",
   ...........................
                   "virtual": 1
               },
               "vda": {
                   "holders": [],
                   "host": "",
                   "links": {
                       "ids": [],
                       "labels": [],
                       "masters": [],
                       "uuids": []
                   },
                   "model": null,
                   "partitions": {
                       "vda1": {
                           "holders": [],
   ...........................
                   "sectors": "8388608",
                   "sectorsize": "512",
                   "size": "4.00 GB",
                   "support_discard": "0",
                   "vendor": "0x1af4",
                   "virtual": 1
               }
           },