Question

我正在尝试在ansible playbook中运行命令任务，如果失败，我想运行救援部分。如果命令失败（退出状态！= 0）并且stderr输出不包含某个字符串，我希望失败状态是这样的

- block:
    - name: some command
      command: "command {{ my_var }}"
      register: command_status
      failed_when: command_status.rc != 0 and "Some text" not in command_status.stderr 
      changed_when: false
  rescue:
    - name: error occurred. Rolling back
      command: rescue-command

上面的问题是，如果上面没有定义变量my_var，命令将失败（带有the field 'args' has an invalid value, which appears to include a variable that is undefined之类的消息，救援部分将运行，这是不可取的。有没有避免Ansible考虑Ansible特定错误与来自剧中实际命令的错误？

我希望rc返回值只能特定于命令，但似乎并非如此。

我正在运行Ansible 2.3

Answer 1

不直接区分错误的来源，而是更多地针对您的用例进行黑客攻击：

您可以将function clear_out_potential_duplicate_events( $post_id, $post = null, $update = false ) { if ( DOING_CRON === false ) { return false; } if ( $update === true ) { return false; } global $wpdb; $wptexturize = remove_filter( 'the_title', 'wptexturize' ); $title_check = get_the_title( $post_id ); if ( $wptexturize ) { add_filter( 'the_title', 'wptexturize' ); } $start_date_check = get_post_meta( $post_id, '_EventStartDate', true ); $end_date_check = get_post_meta( $post_id, '_EventEndDate', true ); $results = $wpdb->get_results( "SELECT ID FROM `wp_posts` JOIN `wp_postmeta` ON wp_posts.ID = wp_postmeta.post_id WHERE wp_postmeta.meta_value = '$start_date_check' AND wp_postmeta.meta_value = '$end_date_check' AND wp_posts.post_title = '$title_check'" ); if ( ! empty( $results ) ) { wp_delete_post( $post_id ); } }的支票添加到救援部分。如果模块失败，则不会定义变量command_status.cmd，因此救援任务将不会运行：

command_status.cmd

Answer 2

如果出现意外错误，我会使用显式fail扩展@ techraf的答案，否则Ansible将继续执行任务，就像没有发生任何不良事件一样。

- block:
    - name: some command
      command: "command {{ my_var }}"
      register: command_status
      failed_when: command_status.rc != 0 and "Some text" not in command_status.stderr 
      changed_when: false
  rescue:
    - fail:
        msg: Unexpected error occurred "{{ command_status.msg }}"
      when: command_status.failed_when_result is undefined

    - name: Expected error occurred. Rolling back
      command: rescue-command

如果错误是意外的，这将导致主机失败（因为failed_when_result已定义，如果failed_when的任务已完成）;如果出现错误（由于failed_when语句命令失败，将应用rescue-command。

在Ansible中区分Ansible错误和任务错误？

2 个答案: