Am 17.01.15 um 03:38 schrieb Jeff Zellner: > 5) Is there a relatively simple way to get "true HA" with a redundant load > balancer? We have two identical machines side-by-side running EL6 and haproxy, > one is a disk dd of the other. In the past we used heartbeat with limited > success; pacemaker has been very problematic for us. For now, we're managing > manually.
i use haproxy in a HA setup with two machines running keepalived. it works quite well so far. you can setup different checks in keepalived. at the moment i do a simple check if haproxy is alive. when haproxy is stopped, my virtual ip-address is switched on the backup server. if the master is coming back the ip-address is switched back again. i should implement a better and more robust check. at the moment it is a simple "is alive check". if haproxy is there but not responding any more or haproxy is very slow, the check would not detect this. but in the last 12 month i had a very stable setup. i can reboot the server for maintenance without (nearly) any downtime of my webpage... markus
