split FQDN

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1

Hello,

I wan´t to split the hostname of my inventory hostnames. The hostnames have two or three subdomains. For Exampel “host.sub1.sub2.domain”
I need two splits. One bevor the first dot (in our example: host) and one after the first dot. (sub1.sub2.domain).
I tried with {{ HOST.split(“.”)[0] }}, but there will be split after every dot.

Any idea?

2

Hi Matt,

A solution like this should work for you:

  • name: “set new hostname fact”
    set_fact:
    my_host: “{{ inventory_hostname.split(‘.’)[0] }}.{{ inventory_hostname.split(‘.’)[1] }}.{{ inventory_hostname,split(‘.’)[-1] }}”
3

Matti** sorry about the miss spelling

4

Hi Tom,

this give me the result host.sub1.hostname but not host.sub1.sub2.hostname. For Hostnames with one subdomain it works fine, but not for Domains with more subdomains.

5

Hi Matti,

I'm not exactly sure what you are trying to accomplish, but I would
like to point out that `split()` has an optional parameter `maxsplit`
that limits the number of splits that are actually done. Shouldn't
that help to solve your problem?

In [11]: s='host.sub1.sub2.example.com'

In [12]: s.split('.', 2)
Out[12]: ['host', 'sub1', 'sub2.example.com']

In [13]: s.split('.', 3)
Out[13]: ['host', 'sub1', 'sub2', 'example.com']

6

Hi Andreas,

that’s exactly what I need.

In [12]: s.split(‘.’, 1)
Out[12]: [‘host’, ‘sub1.sub2.example.com’]

Thanks.