有没有办法使用正则表达式匹配ansible中的主机? [英] Is there a way to use a regular expression to match hosts in ansible?

问题描述

我正在尝试使用正则表达式模式与ansible匹配主机，但是它无法按预期工作. 我的库存如下所示:

I am trying to match hosts using a regex pattern with ansible but it is not working as expected. My inventory is as seen below:

[group1]
hello1
world1
hello2
world2

[group2]
hello3     

我的任务是:

- debug:
    msg: "{{ item }}"
  with_inventory_hostnames:
    - ~hello*

从他们的文档中:

Using regexes in patterns
You can specify a pattern as a regular expression by starting the pattern with ~:

~(web|db).*\.example\.com

当我执行任务时，没有输出.我是使用正则表达式的n00b，所以我的正则表达式可能出错吗?

When I execute the task there is no output. I am a n00b with regex so could it be possible my regex is wrong?

推荐答案

Q:我的正则表达式是否可能是错误的?"

A:这是一个错误.请参见 inventory_hostnames查找不支持模式#17268 中的通配符.它可能是在2.10中修复的.但我认为您的模式无效，因为文档表示: "You can use wildcard patterns with FQDNs or IP addresses, as long as the hosts are named in your inventory by FQDN or IP address" .库存中的主机既不是FQDN也不是IP.

A: It's a bug. See inventory_hostnames lookup doesn't support wildcards in patterns #17268. It will be probably fixed in 2.10. But your pattern wouldn't work, I think, because the doc says: "You can use wildcard patterns with FQDNs or IP addresses, as long as the hosts are named in your inventory by FQDN or IP address". The hosts in your inventory are neither FQDN nor IP.

Q:有没有办法使用正则表达式匹配ansible中的主机?"

A:是的.它是.一种非常方便的方法是使用模块添加主机.例如下面的剧本

A: Yes. It is. A very convenient way is to create dynamic groups with the module add_host. For example the playbook below

- hosts: localhost
  tasks:
    - add_host:
        name: "{{ item }}"
        groups: my_dynamic_group
      loop: "{{ groups.all|select('match', my_pattern)|list }}"
      vars:
        my_pattern: '^hello\d+$'

- hosts: my_dynamic_group
  tasks:
    - debug:
        var: inventory_hostname

给予

    "inventory_hostname": "hello2"
    "inventory_hostname": "hello1"
    "inventory_hostname": "hello3"

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