controller hanging on restart on Rocky Linux after setting the limit of open files to infinity/unlimited

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

I have installed a UIM robot on Rocky Linux, and as part of the installation I made the following modification to the service entry which allows the processes to open an unlimited number of files:

[Service]
LimitNOFILE=infinity

 

After making this change my robots will not come up after restart and seem to be hung up.

The last message in the controller.log is "Stopping processes from previous run" and nothing is logged after that and the probes do not start.

 

The output of "systemctl status nimbus.service" looks like:

● nimbus.service - UIM server
     Loaded: loaded (/usr/lib/systemd/system/nimbus.service; enabled; preset: disabled)
     Active: active (running) since Thu 2024-05-23 12:50:36 EDT; 35s ago
    Process: 7729 ExecStart=/opt/nimsoft/bin/nimbus /opt/nimsoft (code=exited, status=0/SUCCESS)
   Main PID: 7730 (nimbus)
      Tasks: 7 (limit: 48925)
     Memory: 2.9M
        CPU: 34.831s
     CGroup: /system.slice/nimbus.service
             ├─7730 /opt/nimsoft/bin/nimbus /opt/nimsoft
             ├─7736 "nimbus(controller)"
             ├─7737 sh -c "( lsof -P -p 4103 | grep LISTEN | grep :48002 ) > /dev/null 2>&1"
             ├─7738 sh -c "( lsof -P -p 4103 | grep LISTEN | grep :48002 ) > /dev/null 2>&1"
             ├─7739 lsof -P -p 4103
             ├─7740 grep LISTEN
             └─7741 grep :48002

 

 

Environment

Rocky Linux 8 or 9

Cause

problem with lsof command

Resolution

Instead of "infinity", set the file limit to a very high number, like 500000.  This should resolve the issue.