Hi all , I recived few positive messages form the list , so I decided to make a public port of the whole thing . Why it could be used ? Before you start playing with all this game , you have to understand the limitations of my implementation . All this only allow you to have a sort of sql cluster for an web cluster for example where you can loose a server without any down time in your web cluster. So it give you all time you need to repair the broken server and bring it back on line . It does not provide any failover to the web part for that I recommend if you have few bucks to by an alteon or foundry loadbalancer , and it will do this kind of job very well , if you dont have any bucks go to the LVS . (i can help with exact alteon or foundry configurations) I'll build a step by step guide on what you need : 1) Dynamic Dns conf . all bind conf , and dyn updates 2) Mysql replication conf there is a lot of docs around :=) 3) Watch dog and failover update scripts I'll clean my code to make it more frindly for evry body . 4) Wrappers . Yes to use this kind of cluster you need a wrapper that will separate select querys and send them to the slave . I have wrappers in : Perl ( mod_perl friendly version ) (using apache::dbi) Java . Php . C/C++ (not finished yet ) 5) Set of scripts witch you should use to resync a server after a crash . With all this it should be good for you to wait for mysql team to release all this in a real cluster . (like sun && oracle) I'll do all this as soon as possible . Very best Constantin Bogomolnyi ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "Bogomolnyi Constantin" <[EMAIL PROTECTED]> Sent: Friday, March 16, 2001 1:50 PM Subject: Re: Failover and Replication [HOWTO] > Hi Bogomolnyi, > > I would be interested in your scripts. I have been watching this conversation with interest. I have an application for exactly the same thing. I am going to have 3 > mysql servers, which I would like to use as master and slaves. I also would like to know if it would work with web servers also? > > Edward > > 3/15/2001 12:14:21 AM, "Bogomolnyi Constantin" <[EMAIL PROTECTED]> wrote: > > >Hi , > >I posted a few considerations about fialover implementation , to the list , > >but i don't recived any feed back , well lets see what we have : > > > >But i write a bunch of perl scripts and now I use them in production and > >very happy with the result . > >Here what I have : > >Baiscly what I want is an sql cluster (composed of min 2 servers ) > >that can survive a crash and still working . (we all want this ) > > > >so i set up a very simple replication between a master and a slave > >and I use an dynamic dns to locate slave && master . > >like this : > >master.sql.corp.com 192.168.1.100 > >slave1.sql.corp.com 192.168.1.101 > >slaveN.sql.corp.com 192.168.1.10N > > > >I have a wrapper that send all selects to the slaves and updates to the > >master > >i have an advanced watchdog that check if all sqls are up , and if : > >SLAVE FAIL : > > I simply updater the DNS to slave-1 and all applications still working > > the dns update is very quick (1sec) . > >MASTER FAIL : > > I simply update the DNS to the NEXT slave for the master and next slave > >for > > the slave (to avoid all selects on the master) > > I run change master to on all slaves , and the party keep going > > > >this works from 2 to N servers , > > > >I can setup an opensource project , and put all watchdog/dns update /setup > >stuff > >in it if any body is intrestead in this . > > > >I run this for 2 month and all goes very very well i'm very happy with this > >. > > > >My cluster is : > >5 pc , and I use it for a web cluster (10 pc) so I use 1 slave for 2 httpds > >. > > > >For the moment after an server fail , i sync it back using a simple script , > >the watch dog don't do it because i dont want a buggy server coming in and > >out > >the party . > > > >I would be very happy to release all implementation . > > > >Very best > > > >Constantin Bogomolnyi > > > > > >----- Original Message ----- > >From: "Bryan Coon" <[EMAIL PROTECTED]> > >To: <[EMAIL PROTECTED]> > >Sent: Wednesday, March 14, 2001 6:10 PM > >Subject: Failover and Replication > > > > > >> Hi, > >> > >> We are implementing a linux cluster, and rather than get gouged by oracle > >> (in performance and licensing) would muuuuuch rather use MySQL. I > >searched > >> through the archives and found several references to failover and > >> replication but still have some questions. > >> > >> If I understand correctly, replication creates a working copy of mysql on > >> another server, but it looks like the algorithm to automatically change > >> slave to master if the master dies will not be added until mysql 4.x (from > >> 11.4 in the manual). > >> > >> Is this still the case? Im not sure when that was written, perhaps there > >is > >> news on this front? I also did not find a expected release date > >> > >> Does anyone have any stories/suggestions/experiences in regards to rolling > >> our own monitoring script? > >> > >> Thanks! > >> Bryan > >> > >> --------------------------------------------------------------------- > >> 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 > >> > >> > > > > > >--------------------------------------------------------------------- > >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 > > > > > > > > > --------------------------------------------------------------------- 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
