Ansible Jinja2 template

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Jinja2 について †

• Python の template engine ⇒ Python Jinja2
• Ansible での Jinja2 の使いどころ
  • playbook 自体が Jinja2 テンプレート
  • template タスクで Jinja2 テンプレートで設定ファイルを生成

Playbook 内の変数 †

• 設定方法
  • playbook 内に vars で設定
  • playbook 内に vars_files で、変数を外部定義している YAML ファイルを指定
  • ansible-playbook のコマンド引数 -e
  • FACT
• サンプル
  

  https://github.com/kagyuu/AnsibleExam/blob/master/variable/variable.yml

  ---
  - hosts: localhost
    gather_facts: yes
    vars:
      key1: value1
      key2: value2
    vars_files:
      - extra_vars.yml
  
    tasks:
  
      - name: echo local vars
        debug:
          msg: |
            key1 = {{ key1 }}
            key2 = {{ key2 }}
  
      - name: echo extra vars
        debug:
          msg: |
            exKey1 = {{ exKey1 }}
            exKey2 = {{ exKey2 }}
  
      - name: echo extra vars
        debug:
          msg: |
            pKey1 = {{ pKey1 }}
            pKey2 = {{ pKey2 }}
  
      - name: template
        template: src=templates/template.txt.j2 dest=/tmp/template.txt
  

  https://github.com/kagyuu/AnsibleExam/blob/master/variable/extra_vars.yml

  ---
  exKey1: exValue1
  exKey2: exValue2
  

• 実行結果

  $ ansible-playbook variable.yml -e "pKey1=pValue1 pKey2=pValue2"
   [WARNING]: Host file not found: /etc/ansible/hosts
  
   [WARNING]: provided hosts list is empty, only localhost is available
  
  
  PLAY [localhost] ***************************************************************
  
  TASK [setup] *******************************************************************
  ok: [localhost]
  
  TASK [echo local vars] *********************************************************
  ok: [localhost] => {
      "msg": "key1 = value1\nkey2 = value2\n"
  }
  
  TASK [echo extra vars] *********************************************************
  ok: [localhost] => {
      "msg": "exKey1 = exValue1\nexKey2 = exValue2\n"
  }
  
  TASK [echo extra vars] *********************************************************
  ok: [localhost] => {
      "msg": "pKey1 = pValue1\npKey2 = pValue2\n"
  }
  
  TASK [template] ****************************************************************
  changed: [localhost]
  
  PLAY RECAP *********************************************************************
  localhost                  : ok=5    changed=1    unreachable=0    failed=0
  

FACT †

• 配備先サーバの情報 ⇒ playbook や template で使用可能
• setup タスクで、どんなパラメータが取得可能かためしてみることができる

  $ ansible testserver -m setup
  testserver | SUCCESS => {
      "ansible_facts": {
          "ansible_all_ipv4_addresses": [
              "10.0.2.15"
          ],
          "ansible_all_ipv6_addresses": [
              "fe80::5054:ff:feb2:63eb"
          ],
          "ansible_architecture": "x86_64",
          "ansible_bios_date": "12/01/2006",
          "ansible_bios_version": "VirtualBox",
          "ansible_cmdline": {
              "BOOT_IMAGE": "/vmlinuz-3.10.0-327.13.1.el7.x86_64",
              "LANG": "en_US.UTF-8",
              "biosdevname": "0",
              "console": "ttyS0,115200",
  ...
  

tempalte タスク内での変数 †

• playbook 内の変数をすべて参照可能 (vars, vars_files, ansible-playbook -e "key=value", FACT)
• その他に template タスク独自の変数が 6 つある
• サンプル

  https://github.com/kagyuu/AnsibleExam/blob/master/variable/variable.yml

  ---
  - hosts: localhost
    gather_facts: yes
    vars:
      key1: value1
      key2: value2
    vars_files:
      - extra_vars.yml
  
    tasks:
  
      - name: echo local vars
        debug:
          msg: |
            key1 = {{ key1 }}
            key2 = {{ key2 }}
  
      - name: echo extra vars
        debug:
          msg: |
            exKey1 = {{ exKey1 }}
            exKey2 = {{ exKey2 }}
  
      - name: echo extra vars
        debug:
          msg: |
            pKey1 = {{ pKey1 }}
            pKey2 = {{ pKey2 }}
  
      - name: template
        template: src=templates/template.txt.j2 dest=/tmp/template.txt
  

  https://github.com/kagyuu/AnsibleExam/blob/master/variable/extra_vars.yml

  ---
  exKey1: exValue1
  exKey2: exValue2
  

  https://github.com/kagyuu/AnsibleExam/blob/master/variable/templates/template.txt.j2

  key1 = {{ key1 }}
  key2 = {{ key2 }}
  exKey1 = {{ exKey1 }}
  exKey2 = {{ exKey2 }}
  pKey1 = {{ pKey1 }}
  pKey2 = {{ pKey2 }}
  ansible_managed = {{ansible_managed}}
  template_host = {{template_host}}
  template_uid = {{template_uid}}
  template_path = {{template_path}}
  template_fullpath = {{template_fullpath}}
  template_run_date = {{template_run_date}}
  
  

• 実行結果

  $ ansible-playbook variable.yml -e "pKey1=pValue1 pKey2=pValue2"
  $ cat /tmp/template.txt
  key1 = value1
  key2 = value2
  exKey1 = exValue1
  exKey2 = exValue2
  pKey1 = pValue1
  pKey2 = pValue2
  ansible_managed = Ansible managed: /Users/atsushi/sourcetree/AnsibleExam/variable/templates/template.txt.j2 modified on 2016-06-20 00:30:28 by atsushi on HONODH-no-MacBook-Pro.local
  template_host = HONODH-no-MacBook-Pro.local
  template_uid = atsushi
  template_path = /Users/atsushi/sourcetree/AnsibleExam/variable/templates/template.txt.j2
  template_fullpath = /Users/atsushi/sourcetree/AnsibleExam/variable/templates/template.txt.j2
  template_run_date = 2016-06-20 00:30:33.460985
  

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