【IT Notes】RHCE測驗第十一題 Modify file content

 Create a playbook called /home/student/ansible/issue.yml as follows:

• The playbook runs on all inventory hosts

• The playbook replaces the contents of /etc/issue with a single line of text as follows:

• On hosts in the dev host group, the line reads: Development
• On hosts in the test host group, the line reads: Test
• On hosts in the prod host group, the line reads: Production

【題前說明】

這一題的重點是變數的運用，先建立一個變數用的資料夾，然後在裡面分別建立Development、Test和Production三個群組的檔案，檔案內容則是變數，最後再回到外面建立yml檔，內容要能夠去讀取變數檔，並且部署到三個群組的/etc/issue底下。整體來說是比較簡單的題目，感覺是給考生稍微放鬆和給分用的。

一．解題過程：

建立一個group_vars資料夾，然後裡面再分別新建變數檔案。

[student@workstation ansible]$ mkdir group_vars

[student@control ansible]$ echo "message: Development" > group_vars/dev

[student@control ansible]$ echo "message: Test" > group_vars/test

[student@control ansible]$ echo "message: Production" > group_vars/prod

[student@workstation ansible]$ ll group_vars/

total 12

-rw-r--r--. 1 student student 21 Sep  1  2023 dev

-rw-r--r--. 1 student student 20 Sep  1  2023 prod

-rw-r--r--. 1 student student 14 Aug 12 22:51 test

[student@workstation ansible]$ vim issue.yml　　\\部署的yml內要寫入可讀取變數的腳本

---
- name: create issue
  hosts: all
  tasks:
    - name: create issue file
      copy:
        content: "{{ message }}"
        dest: /etc/issue

二．驗證結果

[student@workstation ansible]$ ansible-playbook -C issue.yml

node5噴錯是正常的，因為它所屬群組並不在要被部署的主機內

[student@workstation ansible]$ ansible-playbook  issue.yml

看到node1到node4都成功的話就ok了

[student@workstation ansible]$ ansible all -m shell -a 'cat /etc/issue'

驗證並讀取/etc/issue看是否成功

三．恢復解題前的環境

[student@workstation ansible]$ vim 11-lab-issue-stop.yml

---
- name: remove issue files
  hosts: all
  tasks:
    - name: remove issue files
      file:
        path: /etc/issue
        state: absent

- name: remove issue.yml
  hosts: 127.0.0.1
  tasks:
    - name: remove issue.yml
      file:
        path: /home/student/ansible/issue.yml
        state: absent

[student@workstation ansible]$ ansible-playbook 11-lab-issue-stop.yml