【IT Notes】RHCE測驗第四題 INSTALL PACKAGES

Create a playbook called /home/student/ansible/packages.yml that:

• Installs the php and mariadb packages on hosts in the dev, test, and prod host groups

• Installs the RPM Development Tools package group on hosts in the dev host group

• Updates all packages to the latest version on hosts in the dev host group

【題前說明】
 這是很入門的考題，目的只是要安裝php和mariadb在node1、node2、node3和node4上；然後node1上再多裝dev tools，並且更新每一台node上的套件至最新版本，全部動作都用ansible來部署。

一．解題過程：

1.建立package.yml，並直接編輯

[student@workstation ansible]$ touch packages.yml
[student@workstation ansible]$ vim packages.yml 

---
  hosts: dev,test,prod
  tasks:
    - name: install php and mariadb
      dnf:
        name: "{{ item }}"
        state: present
      loop:
        - php
        - mariadb
    - name: install devtools on host dev
      dnf:
        name: rpmdevtools       
        state: present
      when: ansible_hostname in groups.dev
    - name: upgrade all packages on host dev
      dnf:
        name: '*'
        state: latest
      when: ansible_hostname in groups.dev
- name: install packages
\\考題這裡要下載的是'@RPM Development Tools'，不過我沒有這包套件，就改成官方的rpmdevtools，應該也是類似的東西

二．驗證結果

[student@workstation ansible]$ ansible-playbook -C packages.yml   \\試跑看看是否正常

[student@workstation ansible]$ ansible-playbook packages.yml   \\沒問題就正式跑

[student@workstation ansible]$ ansible dev -m shell -a 'rpm -qa | grep mariadb'

[student@workstation ansible]$ ansible dev -m shell -a 'rpm -qa  | grep php'

\\驗證dev節點是否有安裝完畢

回傳訊息是這樣就表示安裝成功

三．恢復解題前的環境

回復變更前環境，把剛剛所有安裝的軟體都移除，也順便把本機上的package.yml也刪掉。

[student@workstation ansible]$ vim 04-lab-collection-stop.yml

---
- name: remove packages
  hosts: dev,test,prod
  tasks:
    - name: remove php mariadb
      yum:
        name: "{{ item }}"
        state: absent
      loop:
      - php
      - mariadb
    - name: remove packages groups
      yum:
        name: "rpmdevtools"
        state: absent
      when: inventory_hostname in groups.dev

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

[student@workstation ansible]$ ansible-playbook 04-lab-collection-stop.yml