Nagios Support Forum

Hi Team,

i am getting below error in /var/log/messages

ndo2db: Warning: queue send error, retrying...
localhost ndo2db: Message sent to queue.

This is my sysctl.conf


kernel.msgmnb = 131072000

# Controls the maximum size of a message, in bytes
kernel.msgmax = 131072000

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 4294967295

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 268435456

kernel.msgmni = 256000

Also please find ulimit -a

core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 46668
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 46668
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

i did a reboot also after making changes in kernel parameters.

System configuration is 6GB RAM with 4 CPUS.

No of hosts: 271 and Services: 442

Kindly help as monitoring is affecting badly.

Before we increase your kernel message queues further, we could try setting fewer worker processes. The message queues are used for inter-process communication. Each worker spawns processes to run the actual checks, which could result in a lot of processes.

Please run: This will allow us to see how many workers you have running. If there are a lot, you can limit the amount by running:
I suggest setting the number to 4 (because you have 4 cores) to start with, and seeing if that helps at all.

hi jolson,

No luck

What version of Nagios XI are you running?

2014R2.6

Closing thread as there is already an email ticket open.