7022134: Sentinel server log is showing the error “To many files open” Webui will not open

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Sentinel on RHEL 6.9


Sentinel logs are showing the error “Too many open files (24)” because the application/command/script is hitting the maximum open file limit allowed by Linux.


ncrease limit
Per-User Limit
Open file: /etc/security/limits.conf
Paste following towards end:
* hard nofile 500000
* soft nofile 500000
root hard nofile 500000
root soft nofile 500000
500000 is a good number. It can be increased to a higher number but it can start using alot of memory if it is set to high.
If above changes are not working try adding the following.
Open /etc/pam.d/common-session
Add following line:
session required pam_limits.so
Once the file is saved,logout and login again.System-Wide Limit
Set this higher than user-limit set above.
Open /etc/sysctl.conf
Add following:
fs.file-max = 2097152
sysctl -p
the above will increase “total” number of files that can remain open system-wide.
Verify New Limits
Use following command to see max limit of file descriptors:
cat /proc/sys/fs/file-max
Hard Limit
ulimit -Hn
Soft Limit
ulimit -Sn
if you are logged in as root:
Check limit for other user
Just replace www-data by the tlinux username you wish to check limits for:
su – www-data -c ‘ulimit -aHS’ -s ‘/bin/bash’
Check limits of a running process:
Find process-id (PID):
ps aux | grep process-name
Suppose, XXX is PID, then run following commands to check limits:
cat /proc/XXX/limits


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