Re: MacOSX 10.3 Server deployement
Re: MacOSX 10.3 Server deployement
- Subject: Re: MacOSX 10.3 Server deployement
- From: Pierre Frisch <email@hidden>
- Date: Tue, 6 Jan 2004 15:02:49 -0800
Mark,
This looks really like a hack but I will try it. My bet is that there
is something in WOTaskd that expect an IPv4 behavior when Panther is
IPv6. And this on large hosting site breaks it.
Pierre
On Jan 6, 2004, at 7:41, Mark Fisher wrote:
Pierre,
I have the same problems you describe but my hardware environment is a
bit different. I run a cluster of XServers: One
webserver/application server, One database server and two dedicated
WebObjects application servers.
Before the change to 10.3 I had one application distributed to three
of the servers running over 20 instances on each server. Now (with
the upgrade to 10.3) I'm running 10 instances on each server.
I have been able to trace the problem down to WOTASKD - over time it
opens too many TCP ports to the running instances and finally gets
stuck with a "Too many files open" error - check your
/var/log/webobjects.log for that message.
I was able to work around the problem by writing a CRON task the
counts the number of open TCP connections from WOTASKD and restarts
WOTASKD when the number grows larger than 240 (the crash/hang occurs
when your reach 255 TCP connections)
Here is the line I use to identify the open TCP connections (note; you
will have to adjust your port range if you changed the default or you
have more instances running than I do):
sudo lsof -i tcp:2001-2050 -P
Here is the line I use to restart WOTASKD (I had to fix the startup
script too)
sudo SystemStarter restart 'WebObjects Services'
I run this script every 10 min in a CRON job:
#!/bin/sh
#
# Restart WOTASKD when it has too many TCP connections open
#
# by Mark Fisher 11/28/03
# must be run as "root"
#
maxprocs=240
PROCESSLIST=`sudo lsof -i tcp:2001-2050 -P`
i=0
for process in $PROCESSLIST
do
i=$((i+i))
done
if [ $i -gt $maxprocs ] ;then
echo "Restarting WOTASKD"
`SystemStarter restart 'WebObjects Services'`
fi
echo ""
# end shell script
This solves the problem for now but I really, really wish I knew the
cause of the problem - Is WOTASKD *really* that broken in 10.3? I
wonder how many others out there are having the same trouble getting
10.3 Server & WebObjects working reliably.
If *ANYONE* (Apple are you listening) has any more information on this
problem I would like to hear from you.
Thanks in advance,
Mark FIsher
Chief Software Engineer,
Learning Quest, Inc.
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