Question

我正在尝试在本地流浪者vm中安装和配置应用程序服务器。对于配置，使用Ansible。配置可在第一次启动完成后完成。此时它正在侦听localhost：8000。之后，我可以复制配置文件并重新启动服务。之后，端口更改为8081。

问题是，在覆盖配置文件之前，我需要等待第一次启动完成。要检查第一次启动是否已完成，我在循环中使用了url模块，这很有效。所以vm在第一个 vagrant up -provision 上进行了配置。

但是，如果还有另一个 vagrant配置并且Ansible playbook正在使用循环执行url模块，则由于更改端口而失败。所以我尝试了这个：

- name: configure / check for default server.conf


- command: grep "url.httpport=8081" "/{{ base_dir }}/conf/server.conf"
  ignore_errors: yes
  register: output

- name: configure / Check that app-server is installed successfully (8000)
  block:
    - get_url:
        url: http://localhost:8000/version.txt
        dest: /tmp
      register: result
      until: result is succeeded
      retries: 10
      delay: 30
      register: started
  when: output.rc == 1

- name: configure / Check that app-server is installed successfully (8081)
  block:
    - get_url:
        url: http://localhost:8081/version.txt
        dest: /tmp
      register: result
      until: result is succeeded
      retries: 10
      delay: 30
      register: started
  when: output.rc == 0

我的想法是，关于返回代码，选择正确的块，跳过另一个。但结果如下：

TASK [glue-tomcat8 : configure / check for default server.conf] ***
fatal: [devaws]: FAILED! => {"changed": true, "cmd": ["grep", ".url.httpport=8081", "/opt5/conf/server.conf"], "delta": "0:00:00.003016", "end": "2018-05-22 07:11:51.382776", "msg": "non-zero return code", "rc": 1, "start": "2018-05-22 07:11:51.379760", "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}
...ignoring

TASK [glue-tomcat8 : Check that app server is installed successfully (8000)] ***
fatal: [devaws]: FAILED! => {"msg": "The conditional check 'result is succeeded' failed. The error was: The failed test expects a dictionary"}

因此，似乎get_url模块的条件检查存在问题。当单独使用时，没有条件（何时）而不是在块内部，它正在工作。我的猜测是，Ansible在组合之前和之后都存在问题。我在文档中找不到任何相关内容。所以任何帮助都表示赞赏，并提前感谢您。

Answer 1

首先，我建议不要仅为一（1）个任务使用块。它没有意义。

其次，我建议使用wait_for模块检查您的端口。因此，如果您想检查端口8000或8001，请执行以下操作：

---
  - name: Wait_For Example
    hosts: localhost
    gather_facts: False


    tasks:

      - name: Wait for port 443
        wait_for:
          port: 443
          delay: 0
          timeout: 3
          state: started
        register: _port443
        ignore_errors: True


      - name: Wait for port 8001
        wait_for:
          port: 8001
          delay: 0
          timeout: 3
          state: started
        register: _port8001
        ignore_errors: True


      - name: Debug
        debug:
          var: _port443
        when: 
          - _port443.state is defined
          - _port443.state == "started"
          - _port443.port == 443


      - name: Debug
        debug:
          var: _port8001
        when: 
          - _port8001.state is defined
          - _port8001.state == "started"
          - _port8001.port == 443

请注意，因为在两种情况下都使用相同的变量started。

Answer 2

我得到了它的工作。这是第8层（我）问题:) 启动的变量是一个剩余的，不需要。看起来Ansible被这个变量激怒了。这是我的工作代码：

- command: grep "url.httpport=8081" "/{{ base_dir }}/conf/server.conf"
  ignore_errors: yes
  register: output

- get_url:
    url: http://localhost:8000/version.txt
    dest: /tmp
  register: result
  until: result is succeeded
  retries: 10
  delay: 30
  when: output.rc == 1

- get_url:
    url: http://localhost:8081/version.txt
    dest: /tmp
  register: result
  until: result is succeeded
  retries: 10
  delay: 30
  when: output.rc == 0

ansible：将循环（until）与条件（when）结合起来

2 个答案: