I am trying to increase the maximum open file connection of Mosquitto broker. But i read that inreasing concurrent connections are not controlled by Mosquitto only.
As per our studey we decided for 1 lakh concurrent connection, we are targetting 1.6 GB RAM. But for testing I have to increase from default 1024 connections to 20000
Testing environment confihurations :
t2. micro AWS server with 64 MB 14.04 ubuntu operating system. Changing connection limit in the mosquitto configuration is not reflecting . What will be the reason ?
Please find below the configurations :
Our system wide open connections is configured like :
on /etc/sysctl.conf
fs.file-max =99905
Running the command sysctl -p or cat /proc/sys/fs/file-max is reflecting the changes
In /etc/security/limits.conf
ubuntu hard nofile 45000
ubuntu soft nofile 35000
Mosquitto is installed under the user 'Ubuntu' .
We also added below line of code on /etc/pam.d/common-session
session required pam_limits.so
Running the command ulimit -a in ubuntu user is giving the below result :
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 7859
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 35000
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 7859
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
Below is the configuration in /etc/mosquitto/mosquitto.conf :
# Place your local configuration in /etc/mosquitto/conf.d/
#
# A full description of the configuration file is at
# /usr/share/doc/mosquitto/examples/mosquitto.conf.example
pid_file /var/run/mosquitto.pid
persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
limit nofile 20000 20000
ulimit -n 20000
ulimit -u 20000
#max_connections 25000
But running the command cat /proc/4957/limits is still showing default value 1024 open files:
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 7859 7859 processes
Max open files 1024 4096 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 7859 7859 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
4957 -is the process id of Mosquitto
Any idea, how to solve this issue
Thanks & Regards
Jiji K
