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Unbreakable MySQL Cluster with Galera and Linux Virtual Server (LVS)

Recently we had to set-up a 3-node Galera Cluster with a Load Balancer in front of it. Because Galera Cluster nodes (mysqld) still reply to TCP requests on port 3306 when they are expelled from the Cluster it is not sufficient to just leave it to the Load Balancer to check the port if a Galera node is properly running or not.

Galera Cluster für MySQL und MariaDB Schulung

Sie setzten MySQL oder MariaDB bereits produktiv ein und haben höchste Anforderungen an die Datenbank-Verfügbarkeit? Wenn Sie diese mit Galera Cluster abdecken wollen, ist diese Schulung die Richtige für Sie.

German

Switching from MySQL/MyISAM to Galera Cluster

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Switching from MySQL/MyISAM to Galera Cluster requires that all tables (except those from the mysql, information_schema and performance_schema) are using the InnoDB Storage Engine.

For altering the Storage Engine of the tables we wrote a script (alter_engine.pl) long time ago already. Because we have made many of those switches recently we have extended its functionality.

Bootstrapping Galera Cluster the new way

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A while ago it was pretty inconvenient to start a complete Galera Cluster from scratch. Rolling restart an such things are already working well but bootstrapping was a pain.

With Galera v2.2 new functionality came in. We tried it out and it did not work as documented. :-( Thanks to Teemu's help we found there was a documentation bug in the Galera documentation.

Artikel über MySQL im neuen iX

Hallo MySQL Gemeinde,

Im neuen iX (2012-10) hat es zwei nette Artikel über: MySQL HA-Lösungen (S. 116) und MySQL 5.6 (S. 66).

Viel Spass beim Lesen!

Galera Cluster Nagios Plugin

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Based on customer feedback we have decided to add a plugin Galera Cluster for MySQL to our MySQL Nagios/Icinga Plugins.

The module checks, if the node is in status Primary and if the expected amount of Galera Cluster nodes is available. If not, a warning or an alarm is returned.

Galera Cluster Nagios Plugin

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Aufgrund einer Kundenrückmeldung haben wir uns entschlossen unsere MySQL Nagios/Icinga Plugins um ein Plugin Galera Cluster für MySQL zu erweitern.

Das Modul prüft, ob der Knoten im Status Primary und ob die erwartete Anzahl von Galera Cluster Knoten vorhanden ist. Wenn nicht, wird eine Warnung oder ein Alarm zurückgemeldet.

Galera Cluster discussions at FrOSCon 2012

During and after Henriks great talk about Galera Cluster at the FrOSCon 2012 in St. Augustin we found 2 important things related to Galera Cluster for MySQL:

DOAG SIG MySQL - Replication: September 4, 2012 in Hamburg

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On Tuesday, September 4, 2012 the next DOAG SIG MySQL meeting will take place in Hamburg (Germany) with the topic Replication.

Possible presentations are: MySQL Replication, Galera Cluster, Replication with Oracle GoldenGate, Replication with Zimory Scale and Tungsten Replicator.

The event will presumably be located at the Hotel Böttcherhof at Wöhlerstrasse 2.

FromDual Newsletter Frühling 2012

Sehr geehrte MySQL-Nutzerinnen und -Nutzer,

Mit diesem Newsletter bringen wir Sie auf den neuesten Stand was das Produkt MySQL und unsere Dienstleistungen betrifft.

German

FromDual Newsletter Spring 2012

Dear MySQL User,

With this newsletter we bring you up to date about MySQL and our Services.

If you are not interested in this newsletter or if you are the wrong recipient, you can unsubscribe here or even better send this newsletter to the right person.

English

MySQL and Galera Load Balancer (GLB)

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When you install a Galera Cluster for MySQL for High Availability (HA) it is not enough to install the Database Cluster to achieve this goal. You also have to make the application aware of this HA functionality. This is typically done with some kind of load balancing mechanism between the database and the application.

We have several possibilities how to make such a load balancing possible:

FromDual Performance Monitor for MySQL (MPM) v0.9 released

On April 2nd 2012 FromDual released the new version v0.9 of its Performance Monitor for MySQL (mpm). The new version can be downloaded from here.

The Performance Monitor for MySQL (mpm) is an agent which is hooked into Zabbix. Zabbix is an integrated Enterprise Monitoring solution which can produce performance graphs and alerting.

The changes in the new release are:

Codership partners with FromDual to offer consulting and support services for Galera Cluster for MySQL

Helsinki, Finland, Uster, Switzerland – February 18, 2012 – Codership, the provider of Galera Cluster for MySQL, and FromDual, a MySQL consulting company, today announced collaboration to offer Galera Cluster technology and related support and consulting services for Galera users all over the world, especially in German speaking countries Germany, Austria and Switzerland (DACH). Galera Cluster is a synchronous, true multi-master replication cluster for MySQL using the well known InnoDB storage engine.

Codership und FromDual vereinbaren Zusammenarbeit bei Beratungs- und Support-Dienstleistungen für Galera Cluster auf MySQL

Helsinki, Finnland, Uster, Schweiz – 18. Februar 2012 – Codership, Anbieter des Galera Clusters für MySQL, und FromDual, eine MySQL Beratungsfirma, kündigen eine Zusammenarbeit bei der Verbreitung von Galera Cluster Technologie und dazugehörigen Support- und Beratungs-Dienstleistungen für Galera Anwender an. Galera Cluster ist ein synchroner, echter Multi-Master Replikations-Cluster für MySQL, welcher die weit verbreitete InnoDB Storage Engine nutzt.

I prefer MySQL binary tar balls with Galera...

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In my set-ups I have different MySQL versions (MySQL 5.0, 5.1, 5.5 and 5.6, Percona Server 13.1 and 24.0, MariaDB 5.2.10, 5.3.3, Galera 1.0, 1.1 and 2.0) running in parallel at the same time.

Rolling upgrade of Galera 1.0 to 1.1

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A few days ago Codership announced their new version Galera v1.1 - synchronous Replication Cluster for MySQL. Before we look at the new feature of Rolling Online Schema Upgrade (OSU) we have a look at how to upgrade to the new Galera release.

New version of FromDual's Performance Monitor for MySQL (MPM) v0.7.2 is out

On December 2nd 2011 FromDual released the new version v0.7.2 of its Performance Monitor for MySQL. The new version can be downloaded from here.

The Performance Monitor for MySQL is an agent which is hooked into the agent of the well known Monitoring solution called Zabbix. Zabbix is an integrated Enterprise Monitoring solution which can produce performance graphs and alerting.

The changes in the new release are:

Building Galera Replication from Scratch

Introduction

MySQL/Galera synchronous Multi-Master Replication consists of 2 parts:

Galera - Synchronous Multi-Master Replication Cluster for MySQL/InnoDB

Galera features

Galera provides the following features:

  • Synchronous replication
  • Active/active multi-master topology
  • Read and write to any cluster node
  • Automatic membership control, failed nodes drop from the cluster
  • Automatic node joining
  • True parallel row level replication
  • Direct client connections
  • Drop-in replacement for native MySQL

Galera benefits

Benefits using Galera Replication:

Undefined

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