make calibre-server use a lock file?

Geremia · 01-18-2017, 03:31 PM

I see there is an option to make calibre-server write the PID to a file. Is this PID a lockfile? If not, is there a way to make calibre-server use a lockfile so multiple instances cannot run?

(I run into this problem because I use initab to respawn calibre-server if it stops running, yet several instances are respawned.)

kovidgoyal · 01-18-2017, 10:02 PM

calibre-server is designed to run multiple instances so you can, for instance, serve different libraries on different ports. So no, the pidfile is not a lock file. It should be trivial to create a wrapper script that creates a lock file for you.

Geremia · 01-20-2017, 11:26 AM

Quote:

Originally Posted by kovidgoyal

It should be trivial to create a wrapper script that creates a lock file for you.

That's a good idea. thanks
I see people using flock.

However, I solved the problem even more easily by removing the "--daemonize" flag!

01-18-2017, 03:31 PM	#1
Geremia Addict Posts: 262 Karma: 100000 Join Date: Oct 2012 Device: Calibre	make calibre-server use a lock file? I see there is an option to make calibre-server write the PID to a file. Is this PID a lockfile? If not, is there a way to make calibre-server use a lockfile so multiple instances cannot run? (I run into this problem because I use initab to respawn calibre-server if it stops running, yet several instances are respawned.)

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01-18-2017, 10:02 PM	#2
kovidgoyal creator of calibre Posts: 45,610 Karma: 28549044 Join Date: Oct 2006 Location: Mumbai, India Device: Various	calibre-server is designed to run multiple instances so you can, for instance, serve different libraries on different ports. So no, the pidfile is not a lock file. It should be trivial to create a wrapper script that creates a lock file for you.

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