upgrade / remove yp server host - who is connected
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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.
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. See man ypserv. Warning: ypserv will not background itself in this mode. Run it in screen or similar.
The evil way: Prevent all connections in /etc/ypserv.securenets and look into /var/log/messages to see who wanted to connect :)
Problem is:
ypservnormally only logs errors into the syslog. This isn't helpful for your use case.Workaround, assuming RHEL/CentOS, other systems should be similar.
/etc/ypserv.securenetsexists and is of any help. This can include a line for every host allowed to use NIS.ypservinto debug mode with the-doption. This should spew out a line for every connection to STDERR. Seeman ypserv. Warning:ypservwill not background itself in this mode. Run it inscreenor similar./etc/ypserv.securenetsand look into/var/log/messagesto see who wanted to connect :)