Ansible:循环服务列表并从实际存在的不需要的服务列表中禁用这些服务 [英] Ansible: Loop over a list of services and disable those from a list of unwanted services which are actually present

问题描述

我正在使用 Ansible 从 RHEL7.5 的基础安装构建基础镜像我想做的一件事是禁用不需要的服务.所以我这样做:

I'm using Ansible to build a base image from a base installation of RHEL7.5 One of the things I want to do is to disable unwanted services. So I do this:

- name: "| disable unwanted services"
  service:
    name: "{{ item }}"
    enabled: no
    state: stopped
  loop: "{{ disabled_services }}"
  when: disabled_services is defined

哪个工作正常，在本地主机上测试；然后我在测试版本上尝试它，它出错了，因为我试图管理的服务之一甚至不存在.

Which works fine, testing on localhost; then I try it on a test build, and it errors because one of the services I'm trying to manage isn't even present.

例如，disabled_services == "ntp postfix ip6tables"，但未安装 ip6tables.我会从模块中收到这样的错误:

Say for example that disabled_services == "ntp postfix ip6tables", but ip6tables isn't installed. I'll get an error from the module like so:

ok: [udggsydasd48] => (item=postfix)
failed: [udggsydasd48] (item=ip6tables) => {"changed": false, "item":"ip6tables", "msg": "Could not find the requested service ip6tables: host"}

所以我调用 service_facts 模块来生成正在运行的服务列表.在这个循环中，我会将if service in services"条件放在这个循环中的什么(和哪里):

So I'm calling the service_facts module to generate a list of running services. What ( and where) in this loop would I put the "if service in services" conditional in this loop:

- name: "| disable unwanted services"
  service:
    name: "{{ item }}"
    enabled: no
    state: stopped
  loop: "{{ disabled_services }}"
  when: disabled_services is defined

如果软件存在，它只会尝试从disabled_services"中的阵列禁用服务?

So that it will only attempt to disable services from the array in "disabled_services" if the software is present?

我宁愿不使用fail_when:从不，因为这会隐藏其他错误.

I'd rather not use a fail_when: never, as this can hide other errors.

谢谢

推荐答案

在加载正在运行的 services 列表后，使用 union filter.

After you load the list of running services, use the union filter.

  loop: "{{ disabled_services | union(services) }}"

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