[TIP] Application launch script wrapper
[TIP] Application launch script wrapper
- Subject: [TIP] Application launch script wrapper
- From: email@hidden
- Date: Fri, 2 Sep 2005 15:47:36 +0200
Hi!
When deploying using WOTask/JavaWOMonitor
we usually specify the path to the application launch script. WOTask launches
this script using the SpawnOfWotaskd.sh script.
This script redirects standard and error
output of the application and its launch script to /dev/null. This makes
live troubleshooting harder than necessary. For one the output of the launch
script is lost. Having this however comes in handy debug an application
that refuses to start.
A great tool for debugging applications
that hang is to send them a QUIT signal. This makes the JVM write a full
thread dump to the error out put. Unfortunately this, by default, is also
lost to /dev/null.
I thus wrote another wrapper script
to the appliaction launch script. This script redirects all output to a
common log file. Rather than replacing SpawnOfWotaskd.sh, I add another
layer of indirection by pointing WOTask to my launchApplication.sh script:
#!/bin/sh
APPLICATION_NAME=
COMMAND_LINE_ARGS=
for arg in "$@"
do
case
${arg} in
-application=*) APPLICATION_NAME=`echo
${arg} | cut -d= -f2`
;;
*)
COMMAND_LINE_ARGS="${COMMAND_LINE_ARGS:+$COMMAND_LINE_ARGS
}${arg}"
;;
esac
done
if [ "${APPLICATION_NAME}"
!= "" ]
then
echo
WILL LAUNCH $@ >>${LOGDIR}/launchApplication.log
${NEXT_ROOT}/Local/Library/WebObjects/Applications/${APPLICATION_NAME}.woa/${APPLICATION_NAME}
${COMMAND_LINE_ARGS} >>${LOGDIR}/launchApplication.log 2>&1
else
echo
APPLICATION NAME NOT FOUND IN $@ >>${LOGDIR}/launchApplication.log
fi
The script needs to figure out the name
of the application to launch. I specify this in JavaWOMonitor with an additional
argument in the application's configuration:
-application=MyApplication
Now all stdout and stderr output goes
to the launchApplication.log file. I rotate this file on a daily basis.
Enjoy!
Pierre
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