I ran in to this and I found only one other post on this is had the fix but it wasn't that clear and a couple years old.
Ubuntu 20.04 Asterisk 16.9
Error Message:
[Jul 20 21:37:16] WARNING[1742] alertpipe.c: Failed to create alert pipe with eventfd(), falling back to pipe(): Too many open files
[Jul 20 21:37:16] WARNING[1742] alertpipe.c: Failed to create alert pipe: Too many open files
Asterisk PID: 1130
Check the limits for the process. Max open file soft limit is 1024
root@trueringless-asterisk:/home/esundberg# cat /proc/1130/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 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 64057 64057 processes
Max open files 1024 4096 files
Max locked memory 16777216 16777216 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 64057 64057 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
edit /etc/asterisk/asterisk.conf
[options]
maxfiles = 4096 ; Maximum amount of openfiles.
Stop the asterisk process
# systemctl stop asterisk
Make sure asterisk is stopped
# ps -ef | grep asterisk
Start the asterisk process
# systemctl start asterisk
Get the New asterisk PID
# ps -ef | grep asterisk
root 4925* 1 16 05:07 ? 00:00:00 /usr/sbin/asterisk
Check the file limits they are now at 4096 for the process
# cat /proc/4925/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 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 64057 64057 processes
Max open files 4096 4096 files
Max locked memory 16777216 16777216 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 64057 64057 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
