Hello list,
Looking for tips on how to troubleshoot this:
net-snmp ver 5.9.1
$ snmpwalk -v2c <etc> localhost .1
<elided>
TCP-MIB::tcpInErrs.0 = Counter32: 0
TCP-MIB::tcpOutRsts.0 = Counter32: 0
TCP-MIB::tcpConnectionState.ipv4."192.168.122.102".52680.ipv4."192.168.1.200".514
= INTEGER: established(5)
TCP-MIB::tcpConnectionProcess.ipv4."192.168.122.102".52680.ipv4."192.168.1.200".514
= Gauge32: 1321
TCP-MIB::tcpListenerProcess.ipv4."0.0.0.0".22 = Gauge32: 970
TCP-MIB::tcpListenerProcess.ipv4."0.0.0.0".25 = Gauge32: 1250
TCP-MIB::tcpListenerProcess.ipv4."0.0.0.0".111 = Gauge32: 951
TCP-MIB::tcpListenerProcess.ipv4."0.0.0.0".8053 = Gauge32: 976
TCP-MIB::tcpListenerProcess.ipv4."0.0.0.0".43677 = Gauge32: 956
TCP-MIB::tcpListenerProcess.ipv4."127.0.0.1".53 = Gauge32: 976
TCP-MIB::tcpListenerProcess.ipv4."127.0.0.1".53 = Gauge32: 976
Error: OID not increasing:
TCP-MIB::tcpListenerProcess.ipv4."127.0.0.1".53
>= TCP-MIB::tcpListenerProcess.ipv4."127.0.0.1".53
Only have trouble with this one OID.
Restarting snmpd does not fix the problem. Rebooting almost
always "fixes" the problem. Happens on 2 different hosts,
one is running "on metal" (a busy hypervisor), one is a
virtual machine running on that hypervisor, with nearly
no activity.
Many hosts (>10) with identical snmp/snmpd configurations, so
I'm tempted to rule out config issues. There are only a tiny
number of TCP listeners on the broken host.
Right now, the virtual machine is experiencing the issue:
$ ssh slacky-0 netstat -ant | cat -n
1 Active Internet connections (servers and established)
2 Proto Recv-Q Send-Q Local Address Foreign
Address State
3 tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN
4 tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN
5 tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN
6 tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN
7 tcp 0 0 0.0.0.0:8053 0.0.0.0:* LISTEN
8 tcp 0 0 0.0.0.0:8053 0.0.0.0:* LISTEN
9 tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
10 tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
11 tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN
12 tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
13 tcp 0 0 0.0.0.0:43677 0.0.0.0:* LISTEN
14 tcp 0 0 192.168.122.102:53 0.0.0.0:*
LISTEN
15 tcp 0 0 192.168.122.102:53 0.0.0.0:*
LISTEN
16 tcp 0 0 192.168.122.102:22 192.168.1.100:57602
ESTABLISHED
17 tcp 0 0 192.168.122.102:52680
192.168.1.200:514 ESTABLISHED
18 tcp6 0 0 :::111 :::* LISTEN
19 tcp6 0 0 :::22 :::* LISTEN
20 tcp6 0 0 ::1:53 :::* LISTEN
21 tcp6 0 0 ::1:53 :::* LISTEN
22 tcp6 0 0 :::35313 :::* LISTEN
23 tcp6 0 0 ::1:631 :::* LISTEN
24 tcp6 0 0 fe80::5054:ff:fec3:9:53
:::* LISTEN
25 tcp6 0 0 fe80::5054:ff:fec3:9:53
:::* LISTEN
According to ps, the daemon was invoked with:
/usr/sbin/snmpd -A -p /var/run/snmpd -a -c /etc/snmp/snmpd.conf
This host has lots of free memory and I see no evidence of a memory leak.
Suggestions for how to debug the daemon for this issue is appreciated,
pointers to docs especially.
--
Charles Polisher
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