A common question we get is: can I add a node to my Galera Cluster without restarting the entire cluster? The simple answer is YES.

A lot worry about the fact that you do list servers that are part of the cluster within your my.cnf, and this file is not reloadable in a dynamic fashion. Fret not, though, because as long as your my.cnf has one active cluster member (the DONOR), you can have it be the JOINER.

If for example, you have 3 nodes: galera1: 159.223.105.21 galera2: 137.184.78.182 galera3: 137.184.65.171

The my.cnf line for wsrep_address should read as follows:

wsrep_cluster_address="gcomm://159.223.105.21,137.184.78.182,137.184.65.171"

It is then trivial for you to have your fourth server (say, galera4: 161.35.120.111), have a my.cnf that reads as follows:

wsrep_cluster_address="gcomm://159.223.105.21,137.184.78.182,137.184.65.171,161.35.120.111"

Now, …

While Galera Manager is ideal for deploying on Amazon AWS or DigitalOcean, or even on your own on-premise hosts, there is a third option that exists, that allows you to monitor an existing cluster that you already have installed. While we won’t go thru installing a Galera Cluster in this post, we will show you how to get Galera Manager to function for this purpose.

Obtain Galera Manager via filling in the form. Once you have the gm-installer on your Galera Manager host, remember to execute: chmod +x gm-installer. We recommend also …

In the event that you are not planning to deploy Galera Cluster using Galera Manager on your own on-premise hosts, it is worth noting that Galera Manager supports the ability to automatically deploy a 3-node Galera Cluster in Amazon Web Services (AWS) Elastic Compute Cloud (EC2) automatically, just by suppling your API key information. Naturally, we also made a video on a step-by-step video on how to install Galera Cluster in an Amazon EC2 using Galera Manager.

It is worth noting that you can use the free tier to deploy your Galera Cluster with Galera Manager for testing purposes.

Obtain Galera Manager via filling in the form. Logon to your AWS Console. Launch just one EC2 …

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 …

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 …

A few weeks ago, we did a Galera Cluster webinar on Managed Galera Clusters on DigitalOcean.

Some of you may notice that the current version of Galera Manager is 1.6.4, and one of the major fixes we have in there is to support the new API token format of DigitalOcean. DigitalOcean has documented this here: Updated API Tokens new management features: in partnership with GitHub –Secret Scanning, Prefixes, and more! and as a consequence we needed to update to accept new API tokens, or it would fail in deployment. If you’re wondering how to create a …

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 server, Galera 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'

…

Codership is pleased to announce a new release of Galera Manager. This is version 1.6.2 of Galera Manager GUI. Users will notice many usability improvements, and multiple fixes for issues filed at the galera-manager-support issue tracker.

The biggest user facing feature is now being able to deploy Galera Manager managed nodes on DigitalOcean, in addition to Amazon Web Services (AWS) Elastic Compute Cloud (EC2). Now with an access token, one can fully deploy a managed cluster from within Galera Manager. 3 node fully managed Galera Clusters on Digital Ocean in under 10 minutes? This is the promise and delivery of the latest Galera Manager.

From a security standpoint, SSL …

Recently we got a question about how one can perform a minor version upgrade of a Galera Cluster, and today we just want to say that it is reasonably straightforward. While upgrades are a feature of Galera Manager that we are most excited to see come soon, today, doing it manually on the command line is quite simple! In this post, we will go through upgrading a 9-node geographically spread cluster, from MySQL 8.0.23 to 8.0.26. We also have extensive documentation: Upgrading Galera Cluster.

We have 3 nodes each in Singapore, London and San Francisco, making the cluster comprise of a total of 9 nodes, as we can confirm by executing: show status like 'wsrep_cluster_size';.

Since we installed all this via the RPM package manager on CentOS 7 by adding the YUM repository to the …