Thank you. But I think I prefer "func" for this job and start it from
main node
On Nov 1, 11:12 am, Thomas Bendler <thomas.bend...@cimt.de> wrote:
> 2010/11/1 Leonko <the.leo...@gmail.com>
>
> > [...]
> > > 2. Make your application server tolerant of database downtime (that
> > > is, have the applications generate sensible errors while the db is down
> > > and recover when it is up, rather than just crash and require an
> > > application server restart).
>
> > If appserver (java app server like jboss) start and can't find db
> > it's crash and need to restart by hand. We are unable to do anything
> > with it.
>
> Make a start script for the Appserver which do the steps for you:
>
> #! /bin/sh
>
> checkdb () {
> [... code to check if DB is up ...]
>
> }
>
> startdb () {
> [... code to start DB if down ...]
>
> }
>
> startApp () {
> [... code to start App if down ...]
>
> }
>
> if [ ! $(checkdb) ]; then
> startdb
> sleep 60
> if [ ! $(checkdb) ]; then
> echo "Failed, couldn't start DB!"; exit
> else
> startApp
> fi
> fi
>
> You can also implement it as a watchdog if you put your code in a construct
> like this:
>
> while true; do
> [... start logic with checks ...]
> sleep 30
> done
>
> Kind regards, Thomas
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