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Increase File Descriptor Limit on Linux

If Brekeke PBX is running on Linux system, you need to increase file descriptor limit to a number greater than the number of ports used by Brekeke PBX.
Default port ranges set in Brekeke PBX and bundled SIP Server are

For v3.x Brekeke PBX:
  • SIP Server: 1000029999
  • PBX: 3000049999
  • Media server: 5000059999

Total number of default ports needed by Brekeke PBX is 50000.

You need to increase the limit of Linux file descriptor to the number more than the ports needed by Brekeke PBX.

If you change the port range at Brekeke PBX, you need to configure the limit of file descriptor at OS with the following instructions.

 

How to check file descriptor limit of user on Linux
1. Execute the following command
# ulimit -n
How to check file descriptor limit of running java processes on Linux

1. Check processID (PID) of running java processes with the following command.

# ps -eaf | grep java | grep -v grep | awk '{print $1,$2,$3,$4,$5,$6,$7,$8}'

 

Example of a result:
 # ps -eaf | grep java | grep -v grep | awk '{print $1,$2,$3,$4,$5,$6,$7,$8}'
 root 3699 1 0 Sep01 ? 03:44:38 /opt/jdk1.8.0_91/bin/java
 root 3731 3699 0 Sep01 ? 00:14:07 /opt/jdk1.8.0_91/jre/bin/java
 root 3828 3699 0 Sep01 ? 00:13:51 /opt/jdk1.8.0_91/jre/bin/java
 root 3871 3699 0 Sep01 ? 00:36:53 /opt/jdk1.8.0_91/jre/bin/java
 root 3916 3699 0 Sep01 ? 00:19:51 /opt/jdk1.8.0_91/jre/bin/java

The value of 2nd field from left is PID of each process.

 

2.Check file descriptor limit of each above process with the following command.

# cat /proc/<PID>/limits
Example of a result:
 # cat /proc/3699/limits

 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            10485760             unlimited            bytes
 Max core file size        0                    unlimited            bytes
 Max resident set          unlimited            unlimited            bytes
 Max processes             29715                29715                processes
 Max open files            50240                50240                files
 Max locked memory         65536                65536                bytes
 Max address space         unlimited            unlimited            bytes
 Max file locks            unlimited            unlimited            locks
 Max pending signals       29715                29715                signals
 Max msgqueue size         819200               819200               bytes
 Max nice priority         0                    0
 Max realtime priority     0                    0
 Max realtime timeout      unlimited            unlimited            us

3. Repeat no.2 for all PIDs.

 

How to increase file descriptor limit on Linux

1. Open and edit /etc/security/limits.conf

2. Change the number in the following lines to a larger number, such as

* soft nofile 50240
* hard nofile 50240

3. restart pc.

 

 

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