Glb

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There are some pretty sophisticated Load Balancers for Galera Clusters setups out in the market (ProxySQL, MaxScale, HAproxy, …). They have many different exotic features. You can nearly do everything with them. But this comes at the cost of complexity. Non of them is simple any more.

A widely underestimated Load Balancer solution for Galera Cluster setups is the Galera Load Balancer from Codership. It is an simple Load Balancer solution which serves all of our daily needs when it comes to Galera …

About

glbd is a simple TCP connection balancer made with scalability and performance in mind. It was inspired by pen, but unlike pen its functionality is limited only to balancing generic TCP connections.

Features:

• list of backend servers is configurable in runtime.
• supports server draining, i.e. does not allocate new connections to server, but does not kill existing ones, waiting for them to end gracefully.
• can use epoll API provided by Linux version 2.6 and higher for ultimate routing performance.
• glb is …

Table of Contents

• Building the Galera Load Balancer
• Starting the Galera Load Balancer
• Querying the Galera Load Balancer
• Draining nodes with Galera Load Balancer
• Removing nodes from and adding nodes to Galera Load Balancer

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 …