I guess my question should perhaps be, does anyone know why the jar that contains the class isn’t already in the classpath and what's the best way to fix it?
-----Original Message----- From: Adrian Lewis [mailto:adr...@alsiconsulting.co.uk] Sent: 09 June 2014 23:37 To: users@cloudstack.apache.org Subject: RE: Examples of configuring DB HA? I'm going to sound stupid here but how do I find the jar that contains the classes and what is the classpath? Is this a bug of some sort? -----Original Message----- From: Rafael Weingartner [mailto:rafaelweingart...@gmail.com] Sent: 09 June 2014 23:28 To: users@cloudstack.apache.org Subject: Re: Examples of configuring DB HA? Well, tomcat is returning 404, because the app is not running. As a consequence of a class not found exception. Find the jar that contains the classes that are missing and add them into the classpath. On Mon, Jun 9, 2014 at 7:18 PM, Adrian Lewis <adr...@alsiconsulting.co.uk> wrote: > I was very close to getting this up and running in the lab (Centos 6.5 > – 2 x sql servers and 1 mgmt server – all running in VMware > Workstation, installed from 4.3 repo) but when setting the > db.ha.enabled to true and restarting the mgmt. server, I now get 404 > from tomcat and the management server log has lines in it saying > things > like: > > > > 2014-06-09 22:48:00,632 ERROR [c.c.u.d.Merovingian2] (main:null) > Unable to get a new db connection > > java.sql.SQLException: Invalid load balancing strategy > 'com.cloud.utils.db.StaticStrategy'. > > […] > > Caused by: java.lang.ClassNotFoundException: > com.cloud.utils.db.StaticStrategy > > > > Anyone got any idea? Tried Googling and searching the mailing list but > nothing that I can see as an answer. I’m just a lowly network engineer > so wouldn’t know what these errors mean but I’m guessing I won’t be > the first. > > > > Any ideas? > > > > *From:* Adrian Lewis [mailto:adr...@alsiconsulting.co.uk] > *Sent:* 06 June 2014 10:51 > *To:* users@cloudstack.apache.org > *Subject:* Re: Examples of configuring DB HA? > > > > Hi all, > > Firstly thanks for the great responses already. > > Secondly, regarding HA vs failover, I had been assuming these as much > the same. Based on what I had read about the new changes in 4.3, I had > assumed that the new feature allows you to configure standard MySQL > (clustering not required - Galera or otherwise) in a multimaster > replication setup and that while management servers only speak with a > single server at a time, failover to a backup server is automatic and > does not need any work on the MySQL side to promote a slave to a > master as with a basic master/slave setup. > > I'm personally not interested in load balancing just yet, simply > having a hot standby DB that takes over automatically. This is what I > take the term HA to mean. > > From the wiki, I'm also taking it that the use of the auto increment > and offset values ensure that the two DBs can safely run as > master-master in the event that each gets written to concurrently > (split brain or just two mgmt servers failing over at slightly > different times). > > It seems that this thread is already highlighting some of the > confusion I and others have faced. Hopefully it will help someone else. > > Thanks again, > > Adrian > > On 6 Jun 2014 07:18, "Shanker Balan" <shanker.ba...@shapeblue.com> wrote: > > 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=34838 > 207 > > > 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=34838 > 207 > > > > > -----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// > <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. > -- Rafael Weingärtner
