Hi Rainer/Simon - I've just had another look at this. With no
application running (IOW, all Java processes killed), I see this behaviour:
# systemctl start apache2
This create a number of apache2 processes (generally 7). 2 new mod_jk
files are created, corresponding to the apache2 process with the lowest PID
# systemctl stop apache2
This does not remove any files (but see below)
# systemctl restart apache2
This has the same effect as a 'start' followed by a 'stop'. A 'reload',
as expected, doesn't change the PIDs and has no effect on file creation
or deletion.
During testing, I did see one occasion on which the current mod_jk files
were deleted. I though this might be a timeout issue, since the restart
was carried out after 7 minutes, which was longer that normal. So, I
carried out 5 more tests, with the restart after 1, 2, 4, 8, and 11
minutes, and in all these cases the old files were retained and not deleted.
Maybe there's a race condition, or something distribution-specific, in
the code which registers the cleanup? I can't do much for a couple of
days, at least, but I'll have a look when I get a minute.
On 19/12/2023 19:03, Rainer Jung wrote:
Hi there,
Am 19.12.23 um 18:05 schrieb EML:
Hi - I'm running mod_jk with an Apache front-end, and I'm having an
issue with the JkShmFile files.
Every time Apache restarts mod_jk creates two new files
(jk-runtime-status.PID and jk-runtime-status.PID.lock). These are
never cleaned up; the log directory simply fills up with these files.
This happens whether or not I explicitly set JkShmFile in the Apache
conf.
That should no happen. There is a cleanup routine registered, which
should delete the files during shutdown. And that's the behavior that
I normally observe.
Is there some way I can persuade mod_jk to use a single file pair,
without the PID suffix, or to delete the previous file pair on a
restart? I'm not doing any load sharing.
If you must remove the PID, you can patch the code and build it
yourself. The ID is added in file common/jk_shm.c in the following line:
sprintf(jk_shmem.filename, "%s.%" JK_PID_T_FMT, fname, getpid());
You could replace it by:
sprintf(jk_shmem.filename, "%s", fname);
If you compile the code yourself, please us the latest version 1.2.49.
As I mentioned, a normal shutdown should already remove the files. A
reload should not change the pid and thereby the files. A restart in
the sense of stop-then-start should also remove the old files.
I'm on Ubuntu 22.04, Apache 2.4.52. The mod_jk version is possibly
1.2.48-1.
Thanks.
Regards,
Rainer
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