当条件在ansible中失败时

Question

我有一个简单的剧本，它根据从 jenkins 输入的 DEPLOY_TO 环境变量将数据加载到不同的实例，该变量的值为 dev 和 test。通过使用 when 条件

将 {{ lookup('env','DEPLOY_TO') }} 变量与 dev 或 test 进行比较

- name: load loadBase files into target mysql dev
  shell: mysql -h {{ lookup('env','db_host_dev') }} -u {{ lookup('env','db_user_dev') }} --password={{ lookup('env','db_root_password_dev') }} {{ lookup('env','db_name') }} < /tmp/{{ item | basename }}
  with_items: "{{ data.loadBase }}"
  no_log: false
  when: "{{ lookup('env','DEPLOY_TO') }} == dev"
          
- name: load loadBase files into target mysql test
  shell: mysql -h {{ lookup('env','db_host_test') }} -u {{ lookup('env','db_user_test') }} --password={{ lookup('env','db_root_password_test') }} {{ lookup('env','db_name') }} < /tmp/{{ item | basename }}
  with_items: "{{ data.loadBase }}"
  no_log: false
  when: "{{ lookup('env','DEPLOY_TO') }} == test"

但是当运行到 DEPLOY_TO 开发或测试的管道时，它失败并出现以下错误

18:34:15  [WARNING]: conditional statements should not include jinja2 templating
18:34:15  delimiters such as {{ }} or {% %}. Found: {{ lookup('env','DEPLOY_TO') }} ==
18:34:15  dev
18:34:15  fatal: [10.0.1.78]: FAILED! => {
18:34:15      "msg": "The conditional check '{{ lookup('env','DEPLOY_TO') }} == dev' failed. The error was: error while evaluating conditional ({{ lookup('env','DEPLOY_TO') }} == dev): 'dev' is undefined\n\nThe error appears to be in '/home/deploy/jenkins/workspace/infrastructure/deploy.yml': line 77, column 11, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n        - name: load loadBase files into target mysql dev\n          ^ here\n"

请问我做错了什么吗？

Answer 1

您有两个问题，都在错误消息中指出。第一个是：

conditional statements should not include jinja2 templating

when 条件的值已经在隐式模板上下文中计算；您不需要（也不应该添加）{{...}} 表达式周围（或内部任何地方）的标记。这让你：

  when: "lookup('env','DEPLOY_TO') == dev"

这会让您遇到第二个错误：

The error was: error while evaluating conditional ({{ lookup('env','DEPLOY_TO') }} == dev): 'dev' is undefined

您正在将 lookup 的结果与名为 dev 的变量进行比较。如果你想将它与文字字符串进行比较，你需要引用它（就像在 lookup 的参数中一样）：

  when: "lookup('env','DEPLOY_TO') == 'dev'"

当条件在ansible中失败时

when condition fails in ansible

shell

jenkins

ansible