Percona announces the release of Percona XtraDB Cluster 5.7.22-29.26 (PXC) on June 29, 2018. Binaries are available from the downloads section or our software repositories.

Percona XtraDB Cluster 5.7.22-29.26 is now the current release, based on the following:

• Percona Server for MySQL 5.7.22
• Galera/Codership WSREP API Release 5.7.21
• Galera Replication library 3.23

Deprecated

The following variables …

Please join Percona’s Chief Evangelist Colin Charles on Thursday, June 28th, 2018, as he presents Securing Database Servers From External attacks at 7:00 AM PDT (UTC-7) / 10:00 AM EDT (UTC-4).

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A critical piece of your infrastructure is the database tier, yet people don’t pay enough attention to it judging by how many are bitten via poorly chosen defaults, or just a lack understanding of running a secure database tier. In this talk, I’ll focus on MySQL/MariaDB, PostgreSQL, and MongoDB, and cover external authentication, auditing, encryption, SSL, firewalls, replication, and more gems from over a decade of consulting in this space from Percona’s 4,000+ …

Kubernetes, and its most popular distribution OpenShift, receives a lot of interest as a container orchestration platform. However, databases remain a foreign entity, primarily because of their stateful nature, since container orchestration systems prefer stateless applications. That said, there has been good progress in support for StatefulSet applications and persistent storage, to the extent that it might be already comfortable to have a production database instance running in Kubernetes. With this in mind, we’ve been looking at running Percona XtraDB Cluster in Kubernetes/OpenShift.

While there are already many examples on the Internet of how to start a single MySQL instance in Kubernetes, for serious usage we need to provide:

• High Availability: how can we guarantee availability …

There are numerous ways to filter your replication stream in MySQL.  So many, that the documentation team has created guided “walk-through” pages for considering the various complex DB Filtering and subsequent Table Filtering paths folks have used for the “global” filtering options.  But now there are “channel specific” options that can be implemented at startup with enhanced… Read More »

Percona announces the release of Percona XtraDB Cluster 5.6.40-26.25 (PXC) on June 20, 2018. Binaries are available from the downloads section or our software repositories.

Percona XtraDB Cluster 5.6.40-26.25 is now the current release, based on the following:

• Percona Server for MySQL 5.6.40
• Galera/Codership WSREP API Release 5.6.39
• Galera Replication library 3.23

All Percona software is open-source and free. …

Please join Percona’s CEO, Peter Zaitsev as he presents MySQL: Scaling and High Availability – Production Experience Over the Last Decade(s) on Tuesday, June 19th, 2018 at 7:00 AM PDT (UTC-7) / 10:00 AM EDT (UTC-4).

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Percona is known as the MySQL performance experts. With over 4,000 customers, we’ve studied, mastered and executed many different ways of scaling applications. Percona can help ensure your application is highly available. Come learn from our playbook, and leave this …

Cluster connection pooling
The new MySQL Cluster 7.6 GA supports NDB connection pooling – using multiple NDBAPI connections from a single mysqld to NDB – to allow increased concurrency and throughput.

Cluster connection pooling has been supported in MySQL Cluster for quite a while.

…

In one of the projects I have been working on, one requirement was the ability to stop traffic from reaching a MySQL host which has been lagging behind its master for longer than a specific amount of time and then bring it back online once the lag has gone away. Of course, this is all automated and no human intervention is required.

In this scenario, we are using HAProxy as the load balancer, and I will walk you through how to configure an agent so we can use HAProxy httpchk to flag the host as up or down, via systemd socket and then automatically set the host as being down/up when applicable, in HAProxy.

I will be setting up a systemd service (I’m running centos7 hosts) and creating a listening socket in the MySQL host we want to monitor so haproxy can have access to replication status.

Scenario:

master: po-mysql1
slaves: po-mysql2, po-mysql3, po-mysql4
secondary slaves: …

ProxySQL 1.4.2 introduced native clustering, allowing several ProxySQL instances to communicate with and share configuration updates with each other. In this blog post, I’ll review this new feature and how we can start working with 3 nodes.

Before I continue, let’s review two common methods to installing ProxySQL.

ProxySQL as a centralized server

This is the most common installation, where ProxySQL is between application servers and the database. It is simple, but without any high availability. If ProxySQL goes down you lose all connectivity to the database.

ProxySQL on app instances

Another common setup is to install ProxySQL onto each application server. This is good because the loss of one ProxySQL/App server will not bring down the entire application.

For more information about the previous installation, please visit this link …

Protective convenience
Recent versions of MySQL has an added security feature, the –login-path option. This feature puts your username and password in an encrypted file, and you refer clients to this file instead of typing plain text passwords on the console, or putting them in scripts.

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