On Thu, 23 Dec 2004 20:46:26 -0500, Carl Fink <[EMAIL PROTECTED]> wrote: > Hi. > > I'm in the process of setting up a warm backup for a server I run. I was in > the middle of hacking together scripts to keep them in sync, but then it > came to me: what if Debian has a package that does that *for* me? > [snip] > > Suggestions?
I don't think there is any one single utility that does this. I have a secondary box setup with various configured server elements. DNS, Apache, MySQL, Courier-Imap/POP, Postfix and Proftpd are my primary peices with often changing configuration data. the majority of my configuration (virtual hosts, relay domains, mail logins, ftp logins etc) comes from mysql. the rest that's in /etc/<daemon>/ is pretty static and is easily sent to the secondary. The easiest way to sync MySQL is to have the secondary set to slave (replication) of the primary server. This way it always has an exact copy of what was on the primary server. It's easy enough to rsync /home and various other parts where mail and web data is stored. As for a 'switch' I would do this: (assuming your servers aren't configured via dhcp and you have control over the IPs) On the secondary box have a cron that 'pings' the to see if its alive. This process should take into consideration the time it takes for your primary server to reboot -- including potential fsck's. ex. if it's down for 1 minute don't switch, but if its down for > 20 minutes switch over. If in the event the primary is non responsive the secondary box can ifup eth0:1 -- an aliased (non automagic) interface using the primary server's ip address. This way it will basically takeover any incoming requests for the now non-responsive main server. Of course, when your primary server comes back to life (either by itself or after being "fixed") there's a good chance some of the data - mail, web, mysql will be out of sync and you would have to then rsync back to the primary server before making it your #1 again. -- Darryl [EMAIL PROTECTED] http://smartssa.com / http://darrylclarke.com -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
