[rhelv6-list] Lots of (thousands) tcp-connections in state TIME_WAIT on heavy load NFS-server
Collins, Kevin [BEELINE]
KCollins at chevron.com
Tue Jan 11 16:36:29 UTC 2011
Port :962 is being connected to... you want to find out what is opening
those connections. You could try using lsof on the source ports instead,
although if you have very short lived processes it might be difficult.
I don't have any RHEL6 with NIS (we use LDAP), so I can't comment on if
it is "normal". I don't think it is behavior I have seen with NIS on
previous versions or RHEL.
From: rhelv6-list-bounces at redhat.com
[mailto:rhelv6-list-bounces at redhat.com] On Behalf Of Masopust, Christian
Sent: Tuesday, January 11, 2011 6:45 AM
To: 'rhelv6-list at redhat.com'
Subject: [rhelv6-list] Lots of (thousands) tcp-connections in state
TIME_WAIT on heavy load NFS-server
I've recently installed a new (big) HP ProLiant DL585-G7 with RHEL 6
working as NFS-server.
Now I've seen thousands of tcp-connections in TIME_WAIT state. I've
net.ipv4.tcp_fin_timeout = 10, but the number of the connections in
TIME_WAIT remains almost
the same (also setting tcp_fin_timeout to 1 doesn't change anything
Checking "netstat -tn" shows:
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address
tcp 0 0 127.0.0.1:47120 127.0.0.1:962
tcp 0 0 127.0.0.1:689 127.0.0.1:962
tcp 0 0 127.0.0.1:46500 127.0.0.1:962
tcp 0 0 127.0.0.1:46927 127.0.0.1:962
tcp 0 0 127.0.0.1:46694 127.0.0.1:962
and lsof for port 962 shows:
lsof -i :962
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ypbind 46372 root 6u IPv4 444939 0t0 TCP *:962 (LISTEN)
so, is it ypbind that is having that much (short lived) connections???
or what else could be the reason for having that much local connections?
thanks a lot,
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