修改檔案內容

1. 下載變數格式檔 report.orig。

   [deyu1@kvm19 ansible]$ wget http://dy.csie.cyut.edu.tw/materials/report.orig
   

2. 查看需要列出報告 report.orig 的變數。

   # Variables report
   HOST=inventoryhostname
   MEMORY=memory_in_MB
   VDA_SIZE=disk_vda_size
   KERNEL=kernel_version
   

3. 撰寫 report.yml 腳本，使用正規表示法搜尋行首為指定開鍵字的行，等號 "=" 後的字串取代成指定的變數內容。

   [deyu1@kvm19 ansible]$ vim report.yml 
   [deyu1@kvm19 ansible]$ cat report.yml 
   - name: Report variables
     hosts: test
     tasks:
       - ansible.builtin.copy:
           src: report.orig
           dest: /root/report.txt
   
       - ansible.builtin.lineinfile:
           path: /root/report.txt
           regexp: "^{{item.key}}"
           line: "{{item.key}}={{item.value}}"
         loop:
         - { key: "HOST", value: "{{inventory_hostname}}" }
         - { key: "MEMORY", value: "{{ansible_memtotal_mb}}" }
         - { key: "VDA_SIZE", value: "{{ansible_devices.vda.size}}" }
         - { key: "KERNEL", value: "{{ansible_kernel}}" }
   

4. ansible-playbook 執行腳本 report.yml。

   [deyu1@kvm19 ansible]$ ansible-playbook report.yml 
   
   PLAY [Report variables] ********************************************************
   
   TASK [Gathering Facts] *********************************************************
   ok: [kvm12]
   
   TASK [copy] ********************************************************************
   changed: [kvm12]
   
   TASK [ansible.builtin.lineinfile] **********************************************
   changed: [kvm12] => (item={'key': 'HOST', 'value': 'kvm12'})
   changed: [kvm12] => (item={'key': 'MEMORY', 'value': 1771})
   changed: [kvm12] => (item={'key': 'VDA_SIZE', 'value': '6.00 GB'})
   changed: [kvm12] => (item={'key': 'KERNEL', 'value': '5.14.0-162.6.1.el9_1.x86_64'})
   
   PLAY RECAP *********************************************************************
   kvm12: ok=3  changed=2  unreachable=0  failed=0  skipped=0  rescued=0  ignored=0
   

5. ansible 使用 shell 模組查看主機 test 的 /root/report.txt，檔案內容確實已改成變數查詢結果。

   [deyu1@kvm19 ansible]$ ansible test -m shell -a "cat /root/report.txt"
   kvm12 | CHANGED | rc=0 >>
   # Variables report
   HOST=kvm12
   MEMORY=1771
   VDA_SIZE=6.00 GB
   KERNEL=5.14.0-162.6.1.el9_1.x86_64