Too many open files

Each process on a computer is allowed to open a limited number of handles to files. Resilio Connect Agent needs to trace al the files in a job, especially sync jobs, and thus may exceed the limit. As a result, this error appear, valid mainly for Linux agents.

View the current limit in the system:

ulimit -n  
ulimit -Sn  //soft limit  
ulimit -Hn  //hard limit

To view the current number of open files by rslgent:

lsof -p <pid_of_agent> | wc -l

If number of open files exceeds the system limit, you might want to increase the limits.

Temporary:

ulimit -n 2048  //will set both soft and hard limits to 2048  
ulimit -Sn 2048 //sets soft limit  
ulimit -Hn 2048 //sets hard limit

The change will remain effective until a reboot or log out.

Permanent:

Edit /etc/security/limits.conf file and add:

* soft nofile 2048  
* hard nofile 2048 // * is a user wildcard. Type username to apply limits for a user.

and restart the agent.

2048 is an example, it is not advised to set more than 65535 files.

Error code SE_TOO_MANY_OPEN_FILES