Most apps where you would be concerned with downtime have load balancers in front of them. This isn't burning fire you make out because you can pull one app ser

Most apps where you would be concerned with downtime have load balancers in front of them. This isn't burning fire you make out because you can pull one app server out of the pool, restart and then put it back in once it is restarted. We do this by using keepalived and renaming a chk.txt file in the root.