Cluster on FromDual GmbH

How does Galera Cluster behave with many nodes?

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 24 Jan 2025 18:12:55 +0000

Recently I had the opportunity to have a lot of Linux systems (VMs with Rocky Linux 9) from one of our regular Galera Cluster trainings all to myself for a week. And MariaDB 11.4.4 with Galera Cluster was already installed on the machines.

MaxScale configuration synchronisation

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 04 Apr 2024 09:53:46 +0000

Overview

A feature that I recently discovered while browsing is the MaxScale configuration synchronisation functionality.

MariaDB Galera Cluster Upgrade Path

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 18 Dec 2020 10:47:51 +0000

Because we conduct many customers in MariaDB Galera Cluster upgrades and because these customers sometimes have pretty old MariaDB Galera Cluster set-ups I think it is good to have a rough MariaDB Galera Cluster Upgrade Path.

Upgrading from MariaDB 10.4 to MariaDB 10.5 Galera Cluster

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 21 Nov 2020 20:58:09 +0000

Because upgrading from MariaDB 10.4 to MariaDB 10.5 (non-clustered) seems not to be a problem
[ 1
] we take the challenge and try to create a receipt based on the MariaDB 10.3 to MariaDB 10.4 Galera Cluster upgrade documentation
[ 3
]:

Limitations of Galera Cluster

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 11 Jul 2015 17:07:40 +0000

If and how to use Galera Cluster for MySQL has been described already by many others…

Logging Galera Cluster conflicts

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 11 Apr 2015 12:30:54 +0000

We typically suggest our customers to use our MySQL/Galera Cluster my.cnf configuration template to avoid MySQL configuration and performance problems.

Replication channel failover with Galera Cluster for MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 19 Jun 2014 07:05:38 +0000

Sometimes it could be desirable to replicate from a Galera Cluster to a single MySQL slave or to an other Galera Cluster. Reasons for this measure could be:

Why FromDual customers are using Galera Cluster for MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 20 Feb 2014 12:34:05 +0000

We are very satisfied with the functionality and the launch. The entire Cluster is running absolutely stable. This is a significant advantage for our customers because we are able to offer our services without interruption. We will use Galera in further projects and convert our existing Master/Slave installations.

Galera Cluster for MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 11 Dec 2013 12:08:32 +0000

Features

Galera is a synchronous multi-master replication Cluster for MySQL/InnoDB databases, having features like:

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

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 13 Jun 2013 17:13:47 +0000

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.

Bootstrapping Galera Cluster the new way

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 05 Feb 2013 19:18:25 +0000

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.

Artikel über MySQL im neuen iX

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 20 Sep 2012 15:12:59 +0000

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).

Galera Cluster Nagios Plugin

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 14 Sep 2012 10:49:59 +0000

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

Galera Cluster discussions at FrOSCon 2012

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 27 Aug 2012 17:18:40 +0000

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:

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

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 19 Feb 2012 09:56:45 +0000

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. Customers can deploy Galera Cluster locally in LAN environments, as geo-clusters over the WAN or as virtual cluster in the cloud.

Building Galera Replication from Scratch

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 13 Nov 2011 12:29:54 +0000

Introduction

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

The wsrep patches for MySQL (codership-mysql) and
the Galera Replication Plugin (galera).

If you do not want to download the prepared binaries you can build it on you own.
First you have to download the native MySQL sources, then patch it with the Galera wsrep patches and compile it. In a second step you have to build the Galera Plugin.

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

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 23 Sep 2011 11:07:03 +0000

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:

MariaDB, Galera and MySQL Support

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 01 Dec 2010 12:26:19 +0000

FromDual is a support partner of MariaDB plc, Codership Oy and Oracle Corporation. This gives us the opportunity to offer you customized enterprise support subscriptions for your mission-critical MariaDB, Galera or MySQL databases for all three vendors.

Active/active failover cluster with MySQL Replication

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 05 Sep 2008 17:00:00 +0000

Electing a slave as new master and aligning the other slaves to the new master

In a simple MySQL Replication set-up you have high-availability (HA) on the read side (r). But for the master which covers all the writes (w) and the time critical read (rt) there is no HA implemented. For some situations this can be OK. For example if you have rarely writes or if you can wait until a new Master is set up.

MySQL Cluster restore

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 22 Mar 2007 19:05:00 +0000

Recently the question came up if it is faster to restore a MySQL cluster when all nodes are up or only ONE node from each node group during restore.

MySQL Active - Active Clustering

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 13 Mar 2007 12:06:00 +0000

It is possible to use an active - active shared-disk cluster in MySQL in some cases. For doing this you have to fulfill the following requirements:

MySQL HA (high availability) Cluster cookbook

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 27 Mar 2011 18:16:34 +0200

In the following article I have summarized some steps and hints to set-up a MySQL active/passive failover Cluster also sometimes called MySQL HA.