How to change dns resolver used by playbook?

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1

Hi Team

I have a playbook i run in several different situations, in each case with a different inventory file.

The inventory files use FQDNs.

In each case i have to edit /etc/resolv.conf to change the dns resolver before running it.

I know i could hardcode IP addresses within inventory files or set up a local nameserver with a bunch of forwarder records, but before i do something like that, a question …

Is there a way to change the DNS resolver on a per playbook basis, or from the commandline?

Thanks ChIP

2

There is no portable way of doing so on Unix/Linux, and while you might be able to invent a method which uses LD_LIBRARY_PATH to circumvent the current resolver library and thus its configuration, I wouldn’t go down that route.

What I would do in this case, and I know you said you’d prefer to avoid it, is use ansible_host= in inventory or group_vars/host_vars, etc.

Alternatively you might be able to set up your own resolver which permits you to reconfigure hosts on the fly, but it’s a lot of work and won’t reduce the number of moving bits.

3

Your playbooks and inventory contains FQDN, you write. Would you be able to generate the inventory with the specific IP addresses on the fly? Be it either a statically created inventory or a dynamic inventory? Just a thought …

4

This sounds like DNS is not set up right on your Ansible controller.

What specifically are you changing in /etc/resolv.conf that makes it work?

5

Thanks for your time. I guess ill have to resort to something like yhat … all totally doable, but just wanted to make sure i wasnnt missing anything.

6

Thanks for the suggestion. DNS is fine.

Im changing ‘nameserver’ clause in resolv.conf to point to the ‘correct’ resolver for each client.