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AnsibleAdvent Calendar 2015

Day 8

ansible v2.0にアップデートする前に

Last updated at Posted at 2015-12-07

まもなくリリースされるAnsible v2.0(rc1)を一足早く触ってみて地雷を踏んでみた。

v2.0の主な変更点

  • Coreのリファクタリング
  • 新しい構文の追加(block/rescue/always)
  • Syntax Errorがより詳細に
  • Strategy Plugins
  • モジュールの追加

インストール

$ pip install paramiko PyYAML Jinja2 httplib2 six
$ git clone -b stable-2.0 git://github.com/ansible/ansible.git --recursive
$ cd ansible/
$ source ./hacking/env-setup
$ ansible --version
ansible 2.0.0 (stable-2.0 f241c70740) last updated 2015/12/08 02:59:55 (GMT +900)
...

既存のplaybookをv2.0で実行する上での注意

基本的にv1.9までのplaybookをそのまま実行できるよう、互換は保たれているが、一部注意する必要がある。

Templateで空のvarは"None"ではなく空の文字列になる

# template
var a is {{ a }}!!
# playbook
vars:
  a:
tasks:
  name check empty value in template
  template: src=path/to/template.j2 dest=/path/to/template.out
# v1.9.4 in template
var a is None!!  # "None"が展開される

# v2.0.0 in template
var a is !!  # 空の文字列""が展開される

varが暗示的に文字列へ変換しない

# playbook

vars:
  b: 123
  c: true
tasks:
  - name: check integer value
    debug:
      var: "{{ b }}"
  - name: check boolean value
    debug:
      var: "{{ c }}"
# v1.9.4 output
TASK: [check integer value] ***************************************************
ok: [xxx.xxx.xxx.xxx] => {
    "var": "123"
}

TASK: [check boolean value] ***************************************************
ok: [xxx.xxx.xxx.xxx] => {
    "var": "True"
}

# v2.0.0 output
TASK [check integer value] *****************************************************
ok: [xxx.xxx.xxx.xxx] => {
   "var": 123
}

TASK [check boolean value] *****************************************************
ok: [xxx.xxx.xxx.xxx] => {
    "var": true
}

改行コードが残る

# Syntax in 1.9.2
vars:
  message: >
    Testing
    some things
tasks:
- debug:
    msg: "{{ message }}"

# Syntax in 2.0.x
vars:
  old_message: >
    Testing
    some things
  message: "{{ old_messsage[:-1] }}"
- debug:
    msg: "{{ message }}"
# Output
"msg": "Testing some things"

引用:https://github.com/ansible/ansible/blob/stable-2.0/CHANGELOG.md

エスケープの挙動が違う

# Syntax in 1.9.x
- debug:
   msg: "{{ 'test1_junk 1\\\\3' | regex_replace('(.*)_junk (.*)', '\\\\1 \\\\2') }}"
# Syntax in 2.0.x
- debug:
    msg: "{{ 'test1_junk 1\\3' | regex_replace('(.*)_junk (.*)', '\\1 \\2') }}"
# Output:
"msg": "test1 1\\3"

引用:https://github.com/ansible/ansible/blob/stable-2.0/CHANGELOG.md

参考資料

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