Did you know that dnsmasq registers all hosts by their name, if they
send their own hostname when requesting DHCP from dnsmasq? Just use
domain=mylab and have that host send hostname. It would make using names
possible without any additional configuration.
I do not get what is the advantage of having IP suffixed by some domain.
It looks like IP address, but it is even longer. Names of machines
should be easy to remember or use, I doubt that would be the case here.
I think we have new feature conf-script, which can generate dnsmasq
configuration on the output. But I doubt we have a possible code for
what you describe. Could you please describe more about intended usage?
Why isn't using just hostname for each host enough? Using dhcp-host
seems enough for similar uses.
I think DLZ plugins for BIND9 are able to do similar things to your
request, but that would be very heavy-weight solution. I think more
motivation for your current design should be shared, because I do not
understand advantage of your solution.
Cheers,
Petr
On 11/23/22 06:47, Feng Shao wrote:
There are a bunch of machines in our lab, and we normally don't have
DNS records configured for them, only accessing by IP. In order to ssh
to them with key auth, I have a config in my .ssh/config like
Host *.mylab
User root
IdentityFile ~/.ssh/id_rsa.work <http://id_rsa.work/>
and I have some "address=/123.123.123.123
<http://123.123.123.123>.mylab/123.123.123.123
<http://123.123.123.123/>" line in dnsmasq.conf. The problem here is I
need to add an entry whenever a new IP comes.
Can this configuration be dynamically? For example,
"address=/*.mylab/somecmd %1", where "somecmd" is a external command
and %1 will be replaced by the name in A/AAAA request. So that for any
DNS request to *.mylab, dnsmasq invoke this external command and pass
the name as argument, the output of external command, which will be
interpreted as IPv4/IPv6 addr then responsed to client?
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Petr Menšík
Software Engineer, RHEL
Red Hat,https://www.redhat.com/
PGP: DFCF908DB7C87E8E529925BC4931CA5B6C9FC5CB
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