Our most favoured method of deploying Galera Clusters via Galera Manager happen to be the on-premise option, which is favoured by our customers and users. We have always been under the impression that the cloud deployments (AWS, DigitalOcean) would have more pull, but majority do prefer an on-premise installation. We have also made an appropriate video: A step-by-step video on how to install Galera Cluster on premises using Galera Manager.

So to start, we will deploy 3 hosts, running CentOS 7. These are just deployed with the base operating system (OS). And of course, you need another host to run your Galera Manager, so in total we have four (4) hosts. Obtain Galera Manager via filling in the form.

Once you have the …

We have produced two new step-by-step videos for installing Galera Clusters either on premise and at Amazon EC2 environments.

The videos can be replayed from links below.

A step-by-step video on how to install Galera Cluster in an Amazon EC2 environment using Galera Manager

A step-by-step video on how to install Galera Cluster in an Amazon EC2 environment using Galera Manager in 15 minutes. With Galera Manager you can manage and monitor your Galera Clusters in Amazon EC2. Galera Cluster in Amazon EC2 is more cost effective and comes with stronger high availability and control in comparison to using Amazon RDS.

WATCH THE VIDEO

A step-by-step video on how to install Galera Cluster on premise using Galera Manager

A step-by-step video on how to install Galera Cluster on premise, on user provided hosts using Galera …

We recently covered Upgrading your Galera Cluster from MySQL 5.7 to MySQL 8.0. We’ve also had questions on how the upgrade path from our usual Galera Cluster “community” edition to the Galera Cluster Enterprise Edition (EE), which includes many new features, like XA transaction support, arm64 support or GCache encryption.

First off, let’s start by installing a Galera Cluster on CentOS 7. The reason we have picked this distribution? Let’s edit the /etc/yum.repos.d/galera.repo and add:

[galera4]
name = Galera
baseurl = https://releases.galeracluster.com/galera-4/centos/7/x86_64
gpgkey = https://releases.galeracluster.com/GPG-KEY-galeracluster.com
gpgcheck = 1

[mysql-wsrep8]
name = MySQL-wsrep
baseurl = https://releases.galeracluster.com/mysql-wsrep-8.0/centos/7/x86_64
gpgkey = …

Codership is pleased to announce a new Generally Available (GA) release of the multi-master Galera Cluster for MySQL 8.0, consisting of MySQL-wsrep 8.0.30 (release notes, download) with Galera replication library 4.13 (release notes, download) implementing wsrep API version 26. This release incorporates all changes to MySQL 8.0.30, adding a synchronous option for your MySQL High Availability solutions.

For the Galera replication library 4.13, we now complete the I/O for the client handshake before starting an asynchronous read to fix …

Recently we had a question on getting your Galera Cluster upgraded from MySQL 5.7 to MySQL 8.0. While we have plenty of extensive documentation on Upgrading Galera Cluster, this blog covers the Linux example for a rolling major upgrade (the procedure is documented, but this is more extensive). So we will describe going from MySQL 5.7.23 to MySQL 8.0.28 on one node. We did this on CentOS 7.

Firstly, let’s start by disabling SELinux by executing setenforce 0.

We need to install the appropriate MySQL 5.7 binaries, so we can grab them from releases.galeracluster.com. Since we have decided on MySQL 5.7.23, we should get the packages from …

This week’s OpenLampTech newsletter has a great mix of round-up posts for you across the PHP and MySQL backend web space. In just 1 more week, we are 1 year old! How nuts is that?!? Enjoy this week’s publication and share with others.

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

In OpenLampTech issue #51, we are looking at content covering:

• WordPress keeps the lights on
• PHP Readonly classes
• Overview of the LOMP stack
• Headless Drupal in the CMS space
• And much much more

A free …

Continuing on from Setting up Galera Load Balancer (GLB), wouldn’t it be nice to ensure that Galera Load Balancer (GLB) handles failover, seamlessly?

Router:
------------------------------------------------------
        Address       :   weight   usage    map  conns
188.166.179.177:3306  :    1.000   0.500    N/A      1
  165.22.50.152:3306  :    1.000   0.500    N/A      1
   165.22.49.92:3306  :    1.000   0.000    N/A      0
------------------------------------------------------
Destinations: 3, total connections: 2 of 493 max

Pool: connections per thread:     1     1     0     0     0     0

Here is an example of a Galera Load Balancer (GLB) handling 3 backend MySQL servers, and it currently has 2 connections, evenly distributed between 2 hosts.

We can verify this by doing: select @@hostname; which shows:

MySQL now supports the INTERSECT and EXCEPT set operators. Set operators work on the results of multiple SELECT statements. In this post, we will see example queries using INTERSECT and EXCEPT commands for a better understanding

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

While MySQL has supported UNION and UNION ALL commands, there were no INTERSECT or EXCEPT commands in the language. This often involved work-around queries. However, MySQL now does support the INTERCEPT and EXCEPT set operators.

For the example queries, I am using 2 simple tables with arbitrary data.

The names …

Codership is pleased to announce a new Generally Available (GA) release of the multi-master Galera Cluster for MySQL 5.7, consisting of MySQL-wsrep 5.7.38 (release notes, download). This release incorporates all changes to MySQL 5.7.39, adding a synchronous option for your MySQL High Availability solutions.

We have backported the InnoDB wsrep applier lock wait timeout from 8.0 which introduces the variable innodb-wsrep-applier-lock-wait-timeout to improve the reliability in resolving …

Anyone operating a blog, newsletter, or other creative side hustle knows there are a lot of moving pieces involved behind the scenes. Keeping the cadence going not only requires commitment and skills, but also various tools and software…

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

At the time of writing, the OpenLampTech developer newsletter is entering its 10th straight month of publishing so I thought it was time to share a ‘Tools of the Trade – …