Poor Man's Monitoring for Solr

as well as being the developer and pr agent for jetwick , sadly i'm also the admin . all in one... at once. here is a minor snippet to get an alert email if your solr index is either not available or contains too few entries. you'll  get a resolved mail if all is fine again.

cd /path/
file=bla.log
emails="your@email.here"
subject="ok: jetwick"
status=ok

cnt=`wget --http-user=user --http-password=password  -t 10 -q "http://your-host.com/solr/select?q=&rows=1&wt=json" -o - | tr ',' '\n' |grep numfound|tr ':' ' '|awk '{print $3}'`
if [ "x$cnt" == x ] || [ "$cnt" -lt 500000 ]; then
  subject="critical: check http://your-host.com/solr"
  status=critical
fi

prev_stat=`cat .status`

if [ "$status" == "critical" ]; then
if [ "$prev_stat" == "ok" ]; then
cat $file | mail $emails -a $file -s "$subject. doc count was only $cnt"
fi
echo critical > .status
else
if [ "$prev_stat" == "critical" ]; then
cat $file | mail $emails -a $file -s "solved: http://your-host.com/solr"
fi
echo ok > .status
fi

echo $status > .status

add via this via crontab -e

*/2 * * * * /path/check-health.sh

if you look at the code there is one mini hack which is necessary if the solr index is down and the cnt is empty:

"x$cnt" == x

from http://karussell.wordpress.com/2010/11/25/poor-men-monitoring-for-solr/