如何在ansible中在特定主机上运行特定任务 [英] how to run a particular task on specific host in ansible

问题描述

我的库存文件的内容 -

my inventory file's contents -

[webservers]
x.x.x.x ansible_ssh_user=ubuntu

[dbservers]
x.x.x.x ansible_ssh_user=ubuntu

在我的任务文件中，它具有共同的角色，即它将在两台主机上运行，​​但我想在主机网络服务器上运行以下任务，而不是在清单文件中定义的 dbservers 中

in my tasks file which is in common role i.e. it will run on both hosts but I want to run a following task on host webservers not in dbservers which is defined in inventory file

- name: Install required packages
  apt: name={{ item }} state=present
  with_items:
    - '{{ programs }}'
  become: yes
  tags: programs

模块何时有用还是有其他方法?我怎么能这样做?

is when module helpful or there is any other way? How could I do this ?

推荐答案

如果你想在所有主机上运行你的角色，但只有一个仅限于 webservers 组的任务，那么 - 就像你已经建议 - when 是你的朋友.

If you want to run your role on all hosts but only a single task limited to the webservers group, then - like you already suggested - when is your friend.

您可以定义如下条件:

when: inventory_hostname in groups['webservers']

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