I just want to clear it up and ask again. I know there are HA options but they seem a little too much for just having two servers. One idea I wanted to get some feedback on is this. s1 192.168.0.254 s2 192.168.0.253 they both serve up web pages s1 does mail both do mysql both are a dns server as well. If www.example.com is hosting on s1 then the secondary dns would be s2 If s1 goes down then s2 would pick up the dns request but instead of saying www.example.com = 192.168.0.254 it would say www.example.com = 192.168.0.253 Or if needed s2 would have virtual ip's waiting to go on if needed ie eth0:0 192.168.0.254 so it would even be more seemless. Of course there is work to sync s1 <--> s2 mysql apache email But that is on the easier side. As far as email goes if s1 goes down then s2 would take over the requests and have a fully synced folder layout of emails as well as users and passwords (though this may be harder unless we can just copy the /etc/passwd and shadow file over? s1 is running ispconfig but we figure the if s2 takes over it can work w/o ispconfig for a bit ie no new users, databases, etc allowed to be added till s1 is back up and data synced back over. Alright any feedback would be great
You can use rsync to sync folders and files (see http://www.howtoforge.com/mirroring_with_rsync ) and MySQL replication for the databases: http://www.howtoforge.com/mysql5_master_master_replication_debian_etch http://www.howtoforge.com/mysql_database_replication
