仅当主机名包含字符串时运行 Ansible 任务 [英] Run an Ansible task only when the hostname contains a string

问题描述

我在一个角色中有多个任务，如下所示.我不想创建另一个 yml 文件来处理这个任务.我已经有一个用于 web 服务器的包含，但是我们的几个 Perl 服务器需要安装一些 web 包.

I have multiple tasks in a role as follows. I do not want to create another yml file to handle this task. I already have an include for the web servers, but a couple of our Perl servers require some web packages to be installed.

- name: Install Perl Modules
  command: <command>
  with_dict: perl_modules

- name: Install PHP Modules
  command: <command>
  with_dict: php_modules
  when: <Install php modules only if hostname contains the word "batch">

主机清单文件

[webs]
web01
web02
web03

[perl]
perl01
perl02
perl03
perl-batch01
perl-batch02

推荐答案

下面应该可以解决问题:

Below should do the trick:

- name: Install PHP Modules
  command: <command>
  with_dict: php_modules
  when: "'batch' in inventory_hostname"

请注意，在 playbook 运行期间，您会跳过几个主机.

Note you'll have a couple of skipped hosts during playbook run.

inventory_hostname 是 Ansible 的神奇"变量之一:

inventory_hostname is one of Ansible's "magic" variables:

此外，inventory_hostname 是主机名的名称，如在 Ansible 的清单主机文件中配置.这可以用于当您不想依赖发现的主机名时ansible_hostname 或其他神秘原因.如果你有很长的FQDN，inventory_hostname_short 也包含直到第一个的部分期间，没有域的其余部分.

Additionally, inventory_hostname is the name of the hostname as configured in Ansible’s inventory host file. This can be useful for when you don’t want to rely on the discovered hostname ansible_hostname or for other mysterious reasons. If you have a long FQDN, inventory_hostname_short also contains the part up to the first period, without the rest of the domain.

来源:Ansible 文档 - 魔术变量以及如何访问其他主机的信息

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