Is it possible to find out which hosts are using a yp server? I want to remove / update an older VM that's acting as a yp-server but it's not clear which clients are out there.
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Problem is: ypserv
normally only logs errors into the syslog. This isn't helpful for your use case.
Workaround, assuming RHEL/CentOS, other systems should be similar.
- Check if
/etc/ypserv.securenets
exists and is of any help. This can include a line for every host allowed to use NIS. - Put
ypserv
into debug mode with the-d
option. This should spew out a line for every connection to STDERR. Seeman ypserv
. Warning:ypserv
will not background itself in this mode. Run it inscreen
or similar. - The evil way: Prevent all connections in
/etc/ypserv.securenets
and look into/var/log/messages
to see who wanted to connect :)
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Sven
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Yow. Sounds a bit draconian. I like it. "Pinch the air hose and see who turns blue." – ethrbunny Jan 26 '19 at 12:25
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1Also see https://serverfault.com/questions/336240/how-can-i-tell-which-clients-are-connecting-to-a-nis-ypserv-master-server?rq=1 – Sven Jan 26 '19 at 12:27