ansible中的一些任务不会被执行

Question

我正在使用ansible来解决部署问题。

我想做以下事情：

1. 安装virtualenv
2. 激活已安装的虚拟环境
3. 检查我是否在虚拟环境中

为此，我有以下剧本：

---
- hosts: servers

  tasks:
    - name: update repository
      apt: update_cache=yes
      sudo: true

  tasks:
    - name: install git
      apt: name=git state=latest
      sudo: true

  tasks:
    - name: install pip
      apt: name=python-pip state=latest
      sudo: true

  tasks:
    - name: installing postgres
      sudo: true
      apt: name=postgresql state=latest

  tasks:
    - name: installing libpd-dev
      sudo: true
      apt: name=libpq-dev state=latest

  tasks:
    - name: installing psycopg
      sudo: true
      apt: name=python-psycopg2 state=latest

  tasks:
    - name: configuration of virtual env
      sudo: true
      pip: name=virtualenvwrapper state=latest

  tasks:
    - name: create virtualenv
      command: virtualenv venv

  tasks:
    - name: virtualenv activate
      shell: . ~/venv/bin/activate

  tasks:
    - name: "Guard code, so we are more certain we are in a virtualenv"
      shell: echo $VIRTUAL_ENV
      register: command_result
      failed_when: command_result.stdout == ""

问题是有时某些任务没有被执行，但是他们必须......例如在我的情况下任务：

  tasks:
    - name: create virtualenv
      command: virtualenv venv

未执行。

但如果我要评论最后两项任务：

  tasks:
    - name: virtualenv activate
      shell: . ~/venv/bin/activate

  tasks:
    - name: "Guard code, so we are more certain we are in a virtualenv"
      shell: echo $VIRTUAL_ENV
      register: command_result
      failed_when: command_result.stdout == ""

前一个有效...

无法得到我做错的事。有人能暗示我吗？

Answer 1

假设hosts: servers涵盖正确的服务器，您应该只有一个tasks条目。这是一个优化和简化的剧本。

---
- hosts: servers
  sudo: yes
  tasks:
  - name: update repository daily
    apt: update_cache=yes cache_valid_time=86400
  - name: install development dependencies
    apt: name={{item}} state=latest
    with_items:
      - git
      - python-pip
      - postgresql
      - libpq-dev
      - python-psycopg2
  - name: configuration of virtual env
    pip: name=virtualenvwrapper state=present
  - name: create virtualenv
    command: virtualenv venv
  - name: virtualenv activate
    shell: . ~/venv/bin/activate
  - name: "Guard code, so we are more certain we are in a virtualenv"
    shell: echo $VIRTUAL_ENV
    register: command_result
    failed_when: command_result.stdout == ""

注意我已经缓存了apt来电，我还将state更改为present。您可能希望安装特定版本，而不是每次运行ansible时重新检查。