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[筆記] Ansible how to use 'list' in yaml file

2018-11-27 筆記 Eric Chang

這幾天在玩ansible 時,碰到一個問題

假如我有個yaml檔作為資料來源,檔名是 abc.yml

大概長這樣

    "teams": [
        {
            "chinese_name": "TEAM1",
            "description": "TEAM1",
            "gid": 10125,
            "location": [
                "hq"
            ],
            "name": "aa",
            "users": [
                "chen",
                "chou",
                "huani",
                "yey",
                "wa"
            ]
        },
        {
            "chinese_name": "TEAM2",
            "description": "TEAM2",
            "gid": 10126,
            "location": [
                "hq"
            ],
            "name": "bb",
            "users": [
                "chhiao",
                "chgc",
                "chy",
                "hsi",
                "li",
                "li",
                "chgchi"
            ]
        }
		]
		

稍微整理一下,比較容易看

    "teams": [
        {
            "chinese_name": "TEAM1",
            "description": "TEAM1",
            "gid": 10125,
            "location": ["hq"],
            "name": "aa",
            "users": ["chen","chou","huani","yey","wa"]
        },
        {
            "chinese_name": "TEAM2",
            "description": "TEAM2",
            "gid": 10126,
            "location": ["hq"],
            "name": "bb",
            "users": ["chhiao","chgc","chy","hsi","li","chgchi"]
        }
		    ]
		

在 ansible playbook 中,我用 include_vars 把這個檔案叫進來

- name: load teams.yml
  tags: env
  include_vars:
    file: files/konwen/teams.yml

這時候在這個執行階段,就會有一個變數叫 teams 裡面有 chinese_name/description/gid 等等這些屬性

其中的 location/users 又是另外一個 list

那如果我想要用users這個清單中的id作為建立帳號的來源

我就可以用底下這段,先把 users 裡面的內容,指給 dc_users 這個 localvar

然後加上 when 的條件,限定只有 name == aa 的 users 才會被指定給 dc_users

- name: set aa_users
  tags: env
  set_fact:
    aa_users: "{{ item.users }}"
  when: item.name == 'aa'
  with_items: "{{ teams }}"

這樣子執行下來是沒有問題的,不過就是醜了點 XD

之後要抓 user 帳號時,就可以直接用 aa_users 來跑迴圈

- name: create folder for aa_users 
  tags: env
  file:
    path: "/tmp/{{ item }}"
    owner: "{{ item }}"
    group: "{{ item }}"
    state: directory
  with_items: "{{ aa_users }}"

很簡單的概念,因為一開始在 teams 這個 var 裡面

users 這個屬性是一個 list

p.s 講話一定要參雜用英文單字,這樣看起來比較屌…

所以沒辦法直接在底下的create folder task 直接叫出來

如果直接叫 teams.users ,那會是一個清單

 ["chen","chou","huani","yey","wa"]

然後 ansible 也很厲害,就這個樣子,他還是會去忠實的執行建立目錄

所以在 /tmp 底下就會多出一個

[“chen”,“chou”,“huani”,“yey”,“wa”]

這個樣子的目錄 ….

所以我的處理方式就是先把這個清單丟給一個local變數 ( aa_users )

後面的task再用這個 {{ aa_users }} 來跑,這樣子就 OK 了

雖說很簡單,但是卡了我一整天吶…

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