仅当安装了软件包时才禁用 systemd 服务 [英] Disable systemd service only if the package is installed

问题描述

这就是我所拥有的

- name: disable os firewall - firewalld
  systemd:
    name: firewalld
    state: stopped
    enabled: no

此任务在安装了 firewalld 软件包的主机上运行良好，但在未安装的主机上失败.

This task works fine on hosts where firewalld package is installed but fails on hosts where it is not.

确保它可以处理未安装 firewalld 的主机的最佳简单方法是什么?我不想使用任何 CMDB，因为它是一个额外的设置.另外，我希望任务是幂等的；使用像 dpkg 或 rpm 这样的 shell 命令来查询是否安装了 firewalld 会使 ansible playbook 摘要报告发生变化，这是我不想要的.>

What is the best simple approach to make sure it can handle hosts which do not have firewalld installed? I do not want to use any CMDB as it's an additional setup. Also, I want the task to be idempotent; using a shell command like dpkg or rpm to query if firewalld is installed makes the ansible playbook summary report changes which I do not want.

推荐答案

以下是使用 failed_when: 的示例.虽然它每次都运行，但如果没有安装包，它会忽略失败:

Here is an example using failed_when:. While it does run every time, it ignores the failure if the package is not installed:

- name: Stop and disable chrony service
  service:
    name:    chronyd
    enabled: no
    state:   stopped
  register: chronyd_service_result
  failed_when: "chronyd_service_result is failed and 'Could not find the requested service' not in chronyd_service_result.msg"

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