Maybe it’s time to report this bug in phabricator?
Anyone knows how to disable the integration between frr and snmpd? This should work as a workaround, and would let we monitor at least some aspects over snmp.
I might setup a test router to try to find out, but any help would be appreciated.
It seems like frrouting issue
I think you can try edit sudo nano /etc/frr/daemons and delete -M snmp from bgpd_options=.... Then run sudo killall bgpd and wait while process run automatically
There is no bgpd_options in this file. I’ll dig deeper and try to find it.
In the meantime the only workaround I found is to stop snmpd.
Edit: I found the actual file to edit to be /etc/frr/daemons.conf. Killing the bgpd process for some reason will not spawn a new process tho, so you will need to reboot the router to bring it back up.
After removing the “-M snmp” option and rebooting. The snmpd service continued to reach 100% CPU and stop responding to queries, but bgpd was unaffected and continued to function normally.
5 interfaces.
Interface S/L
--------- ---
eth0 u/u
eth1 u/u
eth1.111 u/u
eth2 u/u
eth3 A/D
eth4 u/u
eth4.444 u/u
top - 19:06:24 up 23:50, 1 user, load average: 0.23, 0.12, 0.04
Tasks: 142 total, 2 running, 99 sleeping, 0 stopped, 0 zombie
%Cpu0 : 3.7 us, 0.3 sy, 0.0 ni, 96.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 : 1.4 us, 0.7 sy, 0.0 ni, 96.6 id, 0.3 wa, 0.0 hi, 1.0 si, 0.0 st
%Cpu2 : 0.3 us, 0.3 sy, 0.0 ni, 99.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 : 98.7 us, 1.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.3 si, 0.0 st
KiB Mem: 4040552 total, 2620536 used, 1420016 free, 111856 buffers
KiB Swap: 0 total, 0 used, 0 free. 244692 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3963 snmp 20 0 173256 119956 4504 R 100.0 3.0 2:05.66 snmpd
4008 root 20 0 104248 20036 14980 S 4.0 0.5 50:36.23 uacctd
4003 root 20 0 119708 33596 23456 S 1.3 0.8 26:15.33 uacctd
17 root 20 0 0 0 0 S 0.3 0.0 1:14.61 ksoftirqd/1
1008 root 20 0 12064 4692 1556 S 0.3 0.1 0:32.71 haveged
4006 root 20 0 127988 42876 25736 S 0.3 1.1 6:45.53 uacctd
1 root 20 0 110636 5124 3204 S 0.0 0.1 0:01.95 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
3 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_gp
4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_par_gp
5 root 20 0 0 0 0 I 0.0 0.0 0:00.39 kworker/0:0-cgr@fvbrasileiro which exactly VyOS version are you using? I think we need perf utility for looking what function is using in process.
You can chose:
me@BGP-2:~$ sh system image
The system currently has the following image(s) installed:
1: 1.2.3-epa1 (default boot) (running image)
2: 1.2-rolling-201908222129
3: 1.2.0-rolling+201908050337
4: 1.2.0-rolling+201907231917
5: 1.2.2
6: 1.2.0-rolling+201906251727
7: 1.2.0-rolling+201906070337
8: 1.2.0-rolling+201906030337
9: 1.2.1show version should give you the running image version.
The current version is VyOS 1.2.3-epa1.
But, I can also use a vyos-build version to perform the tests.
@fvbrasileiro, can you try some SMP config changes?
edit /etc/default/snmpd
and replace
SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -p /run/snmpd.pid'
to
SNMPDOPTS='-LSed -u snmp -g snmp -I -ipCidrRouteTable,inetCidrRouteTable -p /run/snmpd.pid'
Then restart snmp.
After add “I -ipCidrRouteTable,inetCidrRouteTable” and restart, no problem with high CPU.
Good, I think we can add this by default, can you create task on phabricator with your issue?
I have the same problem and worked well after restart snmp service, but when i reboot the router the /etc/default/snmp file goes to default again, I notice that is modified by the script snmp.py but theres multiples snmp.py files What file should modifiy so, after a router reboot get the right snmp config?
the files I found are the following
/usr/libexec/vyos/conf_mode/snmp.py
/usr/libexec/vyos/op_mode/snmp.py
/lib/live/mount/rootfs/1.2.3.squashfs/usr/libexec/vyos/conf_mode/snmp.py
/lib/live/mount/rootfs/1.2.3.squashfs/usr/libexec/vyos/op_mode/snmp.py
Which one should I modify?
You can try change /usr/libexec/vyos/conf_mode/snmp.py or build own vyos-1x with this changes, or wait for this task ⚓ T1705 High CPU usage by bgpd when snmp is active
Thanks a lot I Found it and change line 220 I comment the old one use as seen below
# SNMP template (/etc/default/snmpd) - be careful if you edit the template.
init_config_tmpl = """
### Autogenerated by snmp.py ###
# This file controls the activity of snmpd
# snmpd control (yes means start daemon).
SNMPDRUN=yes
# snmpd options (use syslog, close stdin/out/err).
# SNMPDOPTS='-LSed -u snmp -g snmp -p /run/snmpd.pid'
SNMPDOPTS='-LSed -u snmp -g snmp -I -ipCidrRouteTable,inetCidrRouteTable -p /run/snmpd.pid'
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