Too many open files

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Description

If you have a large number of cameras, around 128, you may encounter Inotify restrictions, then you may see a message in the server log when adding a camera:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0xe8 pc=0xdda663]

goroutine 1258 [running]:
gitlab.com/yuccastream/yucca/pkg/runner/latest.(*Runner).GetStats(...)
        /builds/yuccastream/yucca/pkg/runner/latest/runner.go:327
gitlab.com/yuccastream/yucca/pkg/server/executor/exec.(*Worker).GetStream(0xc002b74500)
        /builds/yuccastream/yucca/pkg/server/executor/exec/worker.go:188 +0xa3
gitlab.com/yuccastream/yucca/pkg/server/executor/executor/exec.(*Executor).StatusStream(0xc0003f01c0, 0xc00074b6c0)
        /builds/yuccastream/yucca/pkg/server/executor/executor/exec/executor.go:126 +0xb8
gitlab.com/yuccastream/yucca/pkg/server.(*Server).stateWatcher(0xc000c1e000)
        /builds/yuccastream/yucca/pkg/server/server.go:914 +0x233
created by gitlab.com/yuccastream/yucca/pkg/server.(*Server).Start in goroutine 1
        /builds/yuccastream/yucca/pkg/server/server.go:695 +0x4db

And the log of one of the cameras:

Error: too many open files

The default settings in many Linux distributions are as follows:

grep NOFILE /etc/systemd/system.conf
#DefaultLimitNOFILE=1024:524288

Solution

To increase the limits, add the following parameter to /etc/systemd/system.conf:

DefaultLimitNOFILE=10240:524288

Also increase this parameter for the yucca.service systemd unit in /lib/systemd/system/yucca.service:

LimitNOFILE=10240

Then apply the changes and restart the yucca.service process:

sudo systemctl daemon-reload
sudo systemctl restart yucca.service