The master/master(2-way replication) replication of MySQL server gives you HA when one DB server goes down as failover is configured at Management Server side.. Once the DB is up it will catch up the events that are logged on the second DB. In case of failover configured the management server will not fence self, instead it will try to connect to the another db in the list configured.
Again mysql clustering is on data nodes not on the mysql nodes so Cloud Stack will fence itself if sees a down of mysql node. Thanks & Regards Damodar/ -----Original Message----- From: Shanker Balan [mailto:shanker.ba...@shapeblue.com] Sent: Friday, June 6, 2014 11:48 AM To: CloudStack-Users Subject: Re: Examples of configuring DB HA? Hi Damodar, Comments inline. On 06-Jun-2014, at 10:53 am, Damoder Reddy <damoder.re...@citrix.com> wrote: > Hi Adrian, > > For your question, . Is the CS side purely for failover or does it actually > set up part of the replication for you? The answer is, the Cloud Stack does > only failover configuration and the actual replication process on the mysql > side has to be done by own. https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=34838207 > For the second question, Can you easily enable an existing DB for HA or is > this best done before there's any data? The answer is, we can setup > replication even with existing data and then start the management servers. > The mysql documentation contains the clear steps how to setup replication > with existing documentation. Probably that is the reason why we might not > have included these steps in the doc. > The OP is looking for HA, not failover. HA is possible in ACS 4.3.0 using MySQL Clustering. Once you have MySQL Clustering, its multi-master and not one master to many slaves. ACS should not fence itself like it currently does when the master is not available. > The configuraiton we need to do on each management server is as below. > > You can follow the design doc steps if you think there is a minimal > documentation in the 4.3 doc. The design doc also contains the links to mysql > site for setting up the replication for fresh as well as existing setups. > > From the cloud stack side it is purely failover and falling back between the > IPs configured for the master/salve databases. > https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=34838207 > -----Original Message----- > From: Adrian Lewis [mailto:adr...@alsiconsulting.co.uk] > Sent: Friday, June 6, 2014 6:46 AM > To: users@cloudstack.apache.org > Subject: Examples of configuring DB HA? > > Hi all, > > > > Does anyone have any example configs or blog posts explaining the DB > HA features introduced in 4.3? Between the section in the design docs > on the wiki and the official docs, I'm a little confused as to how > it's supposed to be set up - they appear to differ although there's a > lot more detail in the design docs. Some of it is clearly MySQL stuff > that's outside of Cloudstack but some of it is Cloudstack config as > well. I'm just trying to get a feel for what is the best way to use > what's made it into 4.3 final (if different to the design docs). I'm > not too strong on MySQL so I can't easily work out what's a > requirement, what's just recommended (and > implications) and what the Cloudstack side actually does. Is the CS side > purely for failover or does it actually set up part of the replication for > you? Can you easily enable an existing DB for HA or is this best done before > there's any data? Before you run cloudstack-setup-databases? > > > > Shanker - I don't suppose this subject could add to your already excellent > blog post collection? > > > > Thanks in advance, > > > > Adrian -- @shankerbalan M: +91 98860 60539 | O: +91 (80) 67935867 shanker.ba...@shapeblue.com | www.shapeblue.com | Twitter:@shapeblue ShapeBlue Services India LLP, 22nd floor, Unit 2201A, World Trade Centre, Bangalore - 560 055 Find out more about ShapeBlue and our range of CloudStack related services IaaS Cloud Design & Build<http://shapeblue.com/iaas-cloud-design-and-build//> CSForge - rapid IaaS deployment framework<http://shapeblue.com/csforge/> CloudStack Consulting<http://shapeblue.com/cloudstack-consultancy/> CloudStack Infrastructure Support<http://shapeblue.com/cloudstack-infrastructure-support/> CloudStack Bootcamp Training Courses<http://shapeblue.com/cloudstack-training/> This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. Any views or opinions expressed are solely those of the author and do not necessarily represent those of Shape Blue Ltd or related companies. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error. Shape Blue Ltd is a company incorporated in England & Wales. ShapeBlue Services India LLP is a company incorporated in India and is operated under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda is a company incorporated in Brasil and is operated under license from Shape Blue Ltd. ShapeBlue is a registered trademark.
