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Displaying posts with tag: mysql high availability (reset)
Upgrading your Galera Cluster from MySQL 5.7 to MySQL 8.0

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 …

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Seamless failover with Galera Load Balancer

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:

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Galera Cluster for MySQL 5.7.39 released

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 …

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Setting up Galera Load Balancer (GLB)

Galera Load Balancer (GLB) is a scalable and performant, yet easy to use TCP/IP connection balancing proxy. It is the oldest, yet actively maintained load balancer in the MySQL ecosystem, with a wide array of customers using it in production.

Firstly, please request for binaries via contacting sales@galeracluster.com. Once you have access to the package repository, you’ll have access to RPMs. Installing the RPMs are straightforward, and you can also add it to your Yum repository. This blog presumes you already have access to the binaries.

You can start it up, really simply:

glbd --threads 6 127.0.0.1:3306 188.166.179.177:3306 165.22.50.152:3306 165.22.49.92:3306 …
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Galera Manager Installation Best Practices

A few things we have noticed recently when it comes to Galera Manager support requests, that we feel we should address in this blog post.

First and foremost, it is a requirement that you install Galera Manager on a clean host. This means you install the base operating system and nothing else: no Nginx, no Apache, no InfluxDB, etc. The Galera Manager installer (gm-installer) will pull all the requisite packages, set SELinux to permissive during the install, etc. The next release of the gm-installer aims to be less fragile when it comes to this, and will aggressively handle installs on machines that already have software installed on it.

The other common issue is the inability to access ports, generally blocked by a firewall (gm-installer should have fixed this as long as setup is going properly), or some other reason. What gm-installer cannot fix …

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Galera Cluster for MySQL 5.7.38 released

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 5.7.38, adding a synchronous option for your MySQL High Availability solutions.

In MySQL 5.7.38, we now distinguish between unset ssl_mode and ssl_mode explicitly set to “DISABLED”, because previously ssl_mode=DISABLED was ignored in the xtrabackup-v2 script.

This is a rare release where you are also meant to continue using the Galera replication library 3.37 implementing the wsrep API version 25, from the previous release, as there was no changes made to the Galera replication …

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Galera Cluster for MySQL 8.0.28 and 5.7.37 released

Codership is pleased to announce a new Generally Available (GA) release of the multi-master Galera Cluster for MySQL 5.7 and 8.0, consisting of MySQL-wsrep 5.7.37 (release notes, download) and MySQL-wsrep 8.0.28 (release notes, download) with Galera replication library 3.37 (release notes, download) implementing wsrep API …

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Codership releases Galera Cluster Enterprise Edition

The Galera Cluster Enterprise Edition

Codership is pleased to announce the Galera Cluster Enterprise Edition.

Galera Cluster Enterprise Edition consists of an enhanced Galera Cluster serverGalera Manager and Galera Load Balancer.

 

The enhanced Galera Cluster Server includes

1) A new Online Schema Upgrade method called Non Blocking Operations (NBO), adds more high availability to your cluster while performing schema changes.

    • Schema changes made on all cluster nodes in the same total order sequence, with much more efficient locking compared to the Total Order Isolation (TOI) method.
    • SET GLOBAL wsrep_OSU_method='NBO'

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Codership Releases Galera Manager to easily deploy and manage Galera Clusters on premise and in Amazon Web Services

Codership, the leading MySQL High Availability clustering solutions company behind Galera Cluster, is pleased to announce the general availability of Galera Manager, a web-based graphical user interface (GUI) tool to easily deploy and manage your Galera Clusters. With today’s release, you can now create fully managed clusters in Amazon Web Services, you can also deploy clusters on user provided hosts (on premise or in the cloud) and you can also fully monitor your existing clusters.

We now have the concept of a managed node (your typical MySQL instance) and managed host (your typical Linux instance) which you use to deploy Galera Cluster in Amazon EC2, a managed node and a monitored host for user provided hosts (on premise or …

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Galera Cluster for MySQL training in September

Codership, the developers of Galera Cluster for MySQL, provides training sessions in September 2021 for EMEA and USA timezone.

The Advanced Database Administrator with Galera Cluster training course teaches you how to install and configure in real-time a Galera Cluster for your application use cases. You will participate in interactive hands-on labs. Our expert instructor will teach you how to design and maintain your Galera Cluster for MySQL high availability and scalability. If you are a DBA or been given a Galera Cluster to manage, this is the course for you, as you’ll learn how to run your Galera Cluster in an optimal fashion, from setup, performance tuning, monitoring, as well as backups and more.

For more information, please read the full CONTENT BRAKEDOWN  course.

Course Dates

 

EMEA: …

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