I don’t fully understand what I'm doing here but here's something that puzzles me:
[root@cs-mgmt ~]# jar tf /usr/share/cloudstack-management/webapps/client/WEB-INF/lib/cloud-plugin-database-mysqlha-4.3.0.jar META-INF/ META-INF/MANIFEST.MF com/ com/cloud/ com/cloud/utils/ com/cloud/utils/db/ com/cloud/utils/db/StaticStrategy.class META-INF/NOTICE META-INF/DEPENDENCIES META-INF/LICENSE META-INF/maven/ META-INF/maven/org.apache.cloudstack/ META-INF/maven/org.apache.cloudstack/cloud-plugin-database-mysqlha/ META-INF/maven/org.apache.cloudstack/cloud-plugin-database-mysqlha/pom.xml META-INF/maven/org.apache.cloudstack/cloud-plugin-database-mysqlha/pom.properties [root@cs-mgmt ~]# Surely there's the class and that path is where a lot of other cloudstack-related jar files live so I'm guessing that is also in the classpath. Anyone? -----Original Message----- From: Adrian Lewis [mailto:adr...@alsiconsulting.co.uk] Sent: 10 June 2014 00:05 To: 'users@cloudstack.apache.org' Subject: RE: Examples of configuring DB HA? Fresh 4.3 from the RPMs in the repo. Done yesterday. Had to yum install mysql on the management server as the client binaries weren't present but mysql-connector-java was installed as a dependency of the cloudstack rpm. Could something else be missing on the Centos side or does this look like a CS issue? -----Original Message----- From: Rafael Weingartner [mailto:rafaelweingart...@gmail.com] Sent: 10 June 2014 00:01 To: users@cloudstack.apache.org Subject: Re: Examples of configuring DB HA? the last question is the proper one.. ;) Probably because someone forgot it. I also hate when this kind of thing happens... How did you set up the CS version ? I mean fresh install 4.3 or upgrade from an older version? On Mon, Jun 9, 2014 at 7:49 PM, Adrian Lewis <adr...@alsiconsulting.co.uk> wrote: > 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=348 > > 38 > > 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=348 > > 38 > > 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 > -- Rafael Weingärtner
