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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