Clean shutdown about docker-unifi-rpi

[ryansch]

That's pretty serious. I'll look into this the next time I have some free time.

We intentionally don't use jsvc as we don't need the things it gives us inside of docker.

[Vynce]

This may be less serious than it seemed. Looking at /mnt/cache/appdata/unifi/logs/mongod.log inside the container, mongod does appear to listen for SIGTERM. It might be nice for the whole app to shut down cleanly, but AFAICT the database already does and that's the main thing that matters.

One small remaining concern is if mongod happens to take longer than 10s to shut down in some cases and gets killed instead. The log below is from an empty database that's not really being used. It only took 6ms to shut down. I also looked at another database under light load (2 APs and a couple dozen clients) and it took 200ms to shut down. Seems unlikely to be an issue for home use.

Mon Jan 13 02:12:31.935 [signalProcessingThread] got signal 15 (Terminated), will terminate after current cmd ends
Mon Jan 13 02:12:31.935 [signalProcessingThread] now exiting
Mon Jan 13 02:12:31.935 dbexit:
Mon Jan 13 02:12:31.935 [signalProcessingThread] shutdown: going to close listening sockets...
Mon Jan 13 02:12:31.935 [signalProcessingThread] closing listening socket: 7
Mon Jan 13 02:12:31.935 [signalProcessingThread] closing listening socket: 8
Mon Jan 13 02:12:31.935 [signalProcessingThread] removing socket file: /usr/lib/unifi/run/mongodb-27117.sock
Mon Jan 13 02:12:31.935 [signalProcessingThread] shutdown: going to flush diaglog...
Mon Jan 13 02:12:31.935 [signalProcessingThread] shutdown: going to close sockets...
Mon Jan 13 02:12:31.935 [signalProcessingThread] shutdown: waiting for fs preallocator...
Mon Jan 13 02:12:31.935 [signalProcessingThread] shutdown: closing all files...
Mon Jan 13 02:12:31.937 [conn6] end connection 127.0.0.1:36132 (14 connections now open)
Mon Jan 13 02:12:31.937 [conn9] end connection 127.0.0.1:36140 (14 connections now open)
Mon Jan 13 02:12:31.937 [conn7] end connection 127.0.0.1:36134 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn5] end connection 127.0.0.1:36128 (14 connections now open)
Mon Jan 13 02:12:31.937 [conn13] end connection 127.0.0.1:36150 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn4] end connection 127.0.0.1:36126 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn8] end connection 127.0.0.1:36138 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn15] end connection 127.0.0.1:36176 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn10] end connection 127.0.0.1:36142 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn11] end connection 127.0.0.1:36144 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn12] end connection 127.0.0.1:36148 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn2] end connection 127.0.0.1:36122 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn3] end connection 127.0.0.1:36124 (14 connections now open)
Mon Jan 13 02:12:31.938 [conn1] end connection 127.0.0.1:36120 (14 connections now open)
Mon Jan 13 02:12:31.939 [conn14] end connection 127.0.0.1:36152 (14 connections now open)
Mon Jan 13 02:12:31.941 [signalProcessingThread] closeAllFiles() finished
Mon Jan 13 02:12:31.941 [signalProcessingThread] shutdown: removing fs lock...
Mon Jan 13 02:12:31.941 dbexit: really exiting now