Re: [TIP] Application launch script wrapper
Re: [TIP] Application launch script wrapper
- Subject: Re: [TIP] Application launch script wrapper
- From: Geoff Hopson <email@hidden>
- Date: Fri, 2 Sep 2005 15:40:31 +0100
I've not tried this with WO yet, but I am using it with a host of
other Java applications, CruiseControl, stuff like that, to manage
their state. Works well - no idea if it would play nice with WO, but
if anyone has the time/patience...
http://wrapper.tanukisoftware.org/doc/english/introduction.html
Geoff
On 02/09/05, email@hidden <email@hidden> wrote:
>
> 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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