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From Raphael Bauduin <rbli...@gmail.com>
Subject Re: [users@httpd] graceful restart occasionally gives "could not bind" error
Date Fri, 28 May 2010 09:00:18 GMT
On Thu, May 27, 2010 at 6:00 PM, Scott Gifford
<sgifford@suspectclass.com> wrote:
> I don't have an answer for you, but here are a few troubleshooting tips I
> have found helpful.

Thx for the tips, I'll keep the list posted if I discover the origin
of the problem.

Raph

> If you can make it happen pretty often, you could try doing an
> strace/truss/ktrace (I think it's ktrace on BSD) of the process to see what
> system calls it's making and exactly which is failing.  You could also try
> running "netstat -an |grep :443" right before and after you run it to see if
> there's anything else listening on port 443.
> One possibility is that the SO_REUSEADDR socket option somehow isn't being
> set, which would be visible in a trace.
> Another possibility may be that a child process is doing something with the
> socket that prevents it from being closed.  You could look in the logs
> between restarts and see if that gives a clue.  Maybe there's one script
> that is triggering this, for example.  If you tried a graceful restart every
> minute or less, the log interval might be small enough to give you useful
> information.
> You could also try systematically disabling things and see if that helps,
> starting with any modules that aren't used.
> I have had similar problems on earlier versions of Apache but was never able
> to figure them out.  They would only happen once or twice a year, so I
> wasn't able to do much troubleshooting.  I know that doesn't help, but maybe
> it's nice to know that you're not the only one who has seen problems like
> this.
> Hope this helps!
> -----Scott.
>
> On Thu, May 27, 2010 at 10:17 AM, Jeff Trawick <trawick@gmail.com> wrote:
>>
>> On Wed, May 26, 2010 at 9:22 AM, Raphael Bauduin <rblists@gmail.com>
>> wrote:
>> > Hi,
>> >
>> > With an apache 2.2 running on FreeBSD
>>
>> which level of Apache? (2.2.9 had a change in this area of processing)
>> which level of FreeBSD?
>>
>> >                                                    ,
I occasionally get
>> > a problem
>> > with a graceful restart.
>> > Issuing the command apachectl graceful results in these messages in
>> > the error log:
>> >
>> > [Wed May 26 14:45:48 2010] [notice] Graceful restart requested, doing
>> > restart
>> > [Wed May 26 14:45:53 2010] [warn] module dav_module is already loaded,
>> > skipping
>> > [Wed May 26 14:45:53 2010] [crit] (22)Invalid argument: make_sock: for
>> > address [::]:443, apr_socket_opt_set: (IPV6_V6ONLY)
>> > (48)Address already in use: make_sock: could not bind to address
>> > 0.0.0.0:443
>> > no listening sockets available, shutting down
>>
>> hmmm...  dunno why setting that socket option is failing (the first
>> [crit] message)
>>
>> if you don't need IPv6, change your Listen directive from "Listen 443"
>> to "Listen 0.0.0.0:443" to work around the problem, whatever it is
>>
>>
>> >
>> > or this
>> >
>> > [Wed May 26 15:02:52 2010] [notice] Graceful restart requested, doing
>> > restart
>> > [Wed May 26 15:02:57 2010] [warn] module dav_module is already loaded,
>> > skipping
>> > (48)Address already in use: make_sock: could not bind to address
>> > [::]:443
>> >
>> >
>> >
>> > This error is not systematic, but it makes the command unreliable and
>> > unusable in a cron task.
>> >
>> > Any hint as to what causes this problem?
>> >
>> > Thanks in advance!
>> >
>> > Raph
>> >
>> >
>> >
>> > --
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>> > Free Software Developers Meeting: http://www.fosdem.org
>> >
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>> >
>> >
>>
>>
>>
>> --
>> Born in Roswell... married an alien...
>>
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>
>



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