Daemonize and logrotate? about daemonize HOT 3 CLOSED

I understand what you're describing. Logrotate is clearly just unlinking and relinking the file, so the inode isn't changing. The open file descriptor daemonize passes to the daemonized server refers (in the kernel) to that inode; the file name is irrelevant.

Yes, I can see where this can be a problem.

However, there's no easy way to have daemonize close the file descriptor and reopen it, to prevent this problem. The main problem is that daemonize, itself, is no longer running at this point. When it was fired up, it overlaid itself (via exec(2)) with the program you really want to run.

People typically handle this kind of problem in a few different ways.

• Apache, for instance, lets you pipe output into a program, and there are programs out there that'll do log rotation for you, based on the piped-in data. I could extend daemonize to permit this kind of thing, I suppose (i.e., allow -o to specify a pipe to a command). I can see the benefit, but there's a creeping featurism feeling to that approach. daemonize is small and simple; I'd hate to make it needlessly complicated.
• Another one I've seen on Unix systems is to shut down the server, roll its log, then restart the server. This second option might work for you; unless something goes wrong, the server won't be down more than a second or two.

I'm open to suggestions. I'd rather not bloat daemonize, if I can help it, but this is an understandbly annoying problem.

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Thanks for the quick response!

That's more or less what I expected the state of things would be. I just wanted to make sure there wasn't already an appropriate daemonize feature I should have been using. We'll come up with some sort of workaround -- probably a wrapper between daemonize and our scripts that punts output to a log, and reopens the log file when it receives a HUP.

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I've been using the copytruncate property of logrotate, which copies the existing file and then truncates it to 0 size. Working well so far.

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