topic Re: Apache stops serving requests in Operating System - HP-UX

Apache stops serving requests

Arturo Quesada — Mon, 27 Dec 2004 04:57:37 GMT

After 2 or 3 weeks, apache stops. serving. All process httpd are still running but Apache don't respond.
When I try stop Apache, remains about 5 process which have PPID=1 and connot be killed. Actually doing "kill -9 PID" does nothing. I can't start Apache again because port 80 is being used by these process. error.log and acces.log files don't shows anything (or I don't see it).
The only solution is reboot system.
I've got
Apache: 1.3.31
php: 4.3.4

Thanks in advance

Re: Apache stops serving requests

Fred Ruffet — Mon, 27 Dec 2004 05:04:36 GMT

Such case of processes not responding to "kill -9" corresponds to processes blocked on IOs. Next time, try to use lsof to see what files this processes are on, and if there are no problem on this file (disk corruption, files larger than 2GB on nolargefiles FS...)

Regards,

Fred

Re: Apache stops serving requests

Arturo Quesada — Mon, 27 Dec 2004 05:26:17 GMT

Well lsof can help me to these process, but I'd like that Apache doesn't stopped sudenly

Re: Apache stops serving requests

Fred Ruffet — Mon, 27 Dec 2004 05:39:39 GMT

lsof will help you determining what is the reason for those processes to stop...

Have you looked at /var/adm/syslog/syslog.log ?

Regards,

Fred

Re: Apache stops serving requests

Arturo Quesada — Mon, 27 Dec 2004 05:58:39 GMT

syslog.log doesn't say anything about this. I think the problem is in Apache, not in OS.
Actually, the process are running, I do
# ps -fu www
UID PID PPID C STIME TTY TIME COMMAND
www 2073 1 0 Dec 23 ? 1:19 /opt/apache/bin/httpd
www 10655 1 0 Dec 23 ? 1:28 /opt/apache/bin/httpd
www 4830 1 0 Dec 23 ? 1:27 /opt/apache/bin/httpd
#

Re: Apache stops serving requests

Fred Ruffet — Mon, 27 Dec 2004 06:00:57 GMT

If problem where in apache, kill -9 would work.

Regards,

Fred

Re: Apache stops serving requests

Arturo Quesada — Mon, 27 Dec 2004 06:56:39 GMT

That is a good answer. Now, I only can wait for the next stop and try to discover where are the errors.

Re: Apache stops serving requests

rick jones — Tue, 28 Dec 2004 14:00:03 GMT

Next time, before you start killing processes, you might use tusc to see which system calls they are in.

Also, so long as none of the hangers-on have a reference to the listen socket, if the Apache code has a proper SO_REUSEADDR setsockopt() in it, it should be able to restart - however if those hung processes have a reference to the listen socket, you are stuck.

I tend to track Zeus Web Server more closely than Apache since it is so much faster and so much of what I do is performance related - is 1.3.31 particularly old at this point? I was under the impression that the Apache world had move to version 2.

You might compare the number of Apache processes against the limits in the conf file and against maxuproc kernel settings.

Re: Apache stops serving requests

Arturo Quesada — Thu, 20 Jan 2005 05:16:17 GMT

Well, stops is here again.
I need help to see errors in lsof and tusc commands.
Rick, we use Apache 1.31 because it works well.
I send a file whit the output of
# lsof -u www

Re: Apache stops serving requests

rick jones — Thu, 20 Jan 2005 13:04:10 GMT

Works well except when it hangs right?-)

Your attachment was just lsof output, there was no tusc output I could see.

Re: Apache stops serving requests

Arturo Quesada — Fri, 21 Jan 2005 03:31:53 GMT

YouÂ´re right.

The output for tusc is lost (or I canÂ´t find it). I'd like you to tell me which option I should use with tusc next time Apache

Re: Apache stops serving requests

rick jones — Fri, 21 Jan 2005 12:52:26 GMT

might add the -v option to have tusc decode the system call parameters instead of giving their raw values.

Re: Apache stops serving requests

Arturo Quesada — Wed, 16 Feb 2005 05:31:51 GMT

Hello Rick adn Fred again:

I send the tusc output and lsof output for the PID 8337. This process can't be killed doing "kill -9".

Could you help me, please?

Thank you

Re: Apache stops serving requests

rick jones — Wed, 16 Feb 2005 12:29:40 GMT

I'm asking the tusc expert about the tusc message as I cannot recall exactly what it means for a process to be "deactivated." My initial thought was it may have received a SIGSTOP, but that is just a WAG.

Re: Apache stops serving requests

rick jones — Wed, 16 Feb 2005 12:46:01 GMT

My tusc expert has told me that the process deactiveated means it has been totally swapped-out. Might be time for you do do a search of the current patches for your OS release looking for any related to process deactivation. (Assuming there is no good reason for the process to be completely swapped-out).