On Fri, Feb 15, 2002 at 09:43:28AM +0100, Wolfgang Pichler wrote: > I have to set up a HA-Linux Server with Apache and mysql running on > two machines over load balancing. Apache isn't a problem. But mysql. > AFAIK it is impossible to cluster mysql - it "only" supports > replication. As I've said already, we have only two machines, and > two firewalls of course, for web and mysql server - but this two > machines should for the best work load balanced and failsafe. So, if > one machine fails because of a hardware fault - the other machine > must be able to overtake the whole work. So it is necersary to > install Apache and mysql on both server's.
So far, so good. > And, to get the best performance out of it, I've got the following > idea: The whole WebApplication has an own db interface so that it > should be possible to... > First Server runs: apache and mysql master <- all write Operations are > done one the master <- read operations from the first server are also > done one the master. Yep. > Second Server runs: apache and mysql slave <- gets synchronized by the > master <- read operations from the second server are done on the slave > <- write operations are getting directed to the master -> which then > synchronize the slave. Makes sense. > Because of dynamic load balancing this should get a nice average > load. > > If then one machine fails - then you have on both machines everthing > you need to work in standalone mode. Exactly. > The only thing is, that you need some scripts which switches the > databases from slave to master mode, doing synchronization after the > are working again, redirecting all the read/write operations to one > machine, and some additional work. If you can guarantee that writes will only ever go to a single machine, set the MySQL servers up as dual-masters and it'll simplify things quite a bit. Jeremy -- Jeremy D. Zawodny, <[EMAIL PROTECTED]> Technical Yahoo - Yahoo Finance Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936 MySQL 3.23.47-max: up 10 days, processed 328,139,757 queries (378/sec. avg) --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
