Coin and "too many open files" error

Mar 27 00:11:46 personal-coins env[4255]: ERROR:agentlauncher.py:146(6234): Exception during agent launch: '[Errno 24] Too many open files' (attempt: 1)

I had this issue many times in personal-coins. Despite the coin@service unit having a high limit, it's not permitted to apply it because the user systemd instance has a low limit. It can be verified if the limits are low by checking the file /proc/PID/limits, where PID can be the pid of scheduler.py for example.

The following file was needed to change the limits of the user@`id -u`.service for all users on personal-coins:

$ cat /etc/systemd/system/user@.service.d/override.conf 
[Service]
LimitNOFILE=98765

Then run `systemctl daemon-reload` and kill the user-level systemd instances and restart them and relogin.

I'm opening this since I'm guessing it might be affecting production Coin on vmbuilder too. In that case, the user@vmbuilder.service should be changed.