Recently I’ve had to rename a node on a production cluster – however, I did not have an experience on this yet so I decided to try on a sandbox and establish a known procedure. Without further ado, assuming we have 3 nodes and we want to rename ha3’s hostname to ha03.

[root@ha01 ~]# crm status
Last updated: Wed Jun  4 21:55:01 2014
Last change: Wed Jun  4 21:53:35 2014 via crm_attribute on ha01.localdomain
Stack: classic openais (with plugin)
Current DC: ha01.localdomain - partition with quorum
Version: 1.1.10-14.el6_5.2-368c726
3 Nodes configured, 3 expected votes
6 Resources configured


Online: [ ha01.localdomain ha02.localdomain ha3.localdomain ]

 Master/Slave Set: ms_MySQL [p_mysql]
     Masters: [ ha01.localdomain ]
     Slaves: [ ha02.localdomain ha3.localdomain ]
 Clone Set: ping_gw_clone [ping_gw]
     Started: [ ha01.localdomain ha02.localdomain ha3.localdomain ]

Here we go:

1. Put ha3 on standby:

   [root@ha01 ~]# …

MaxScale 0.6.0 was recently released (it is the 3rd alpha, with the beta on the near horizon), and is available for download here.

The particular release only contains 2 great additions and 2 important fixes (and note development continues with the 1.0 (GA) features, but these have not been put into this alpha version).

Important Additions:

1. A feature-complete read/write splitting module, i.e. read and write operations are now balanced in a smarter way to master or slave servers.
2. New client-based features, such as a version string that provides compatibility with the major connectors, the ability to connect through the root user and the use of the Unix socket when MaxScale is co-located with a client application on the same server.

Important Bug Fixes:

1. The new parameter …

Recently, Morgan has been writing on deprecating some MySQL features and inspired by that while working on MySQL on POWER, I wondered “What is the impact of the MySQL query cache on modern hardware?”

We’ve known for over six years (since before we started Drizzle) that the query cache hurt performance. It was for that reason that the query cache was one of the early things to be removed from Drizzle, it just didn’t scale on multi core systems that  we were targeting.

So what about modern hardware? While working on MySQL 5.6 on POWER8, I enabled the query cache and ran a benchmark. …

How To Install Nginx With PHP5 (And PHP-FPM) And MySQL Support On CentOS 6.5

Nginx(pronounced "engine x") is a free, open-source, high-performance HTTP server. Nginx is known for its stability, rich feature set, simple configuration, and low resource consumption. This tutorial shows how you can install Nginx on a CentOS 6.5 server with PHP5 support (through PHP-FPM) and MySQL support.

I have been building a CloudFormation template for MySQL Fabric as an experiment to kick the tyres and further my understanding of how it all works.

For those not familiar, CloudFormation is a way of representing a collection of Amazon Cloud resources (a "stack") into a static json file (a "template"). In my previous company, we managed our AWS account almost exclusively via CloudFormation, and there are two key advantages I see with managing resources via templates:

• It allows for all environments to be synchronized (dev/qa/production).
• It allows for very fast disaster recovery (you can very quickly pick up and restore in another region).

CloudFormation is also a great-fit for MySQL Fabric, since it can remove many of the essential bootstrap steps that come with building a distributed system. It took a bit of work, but I …

There will be 2 community meetups in Tokyo in Japan scheduled for June 2014. Please check and join following: 

• MySQL Casual Talks vol.6
  • Date: June 11th, 2014
  • Time: 19:00
  • Place: Oracle office, Oracle Aoyama Center, 2-5-8 Kita-Aoyama, Minato-ku, Tokyo, Japan
  • More info & Registration
• MySQL Cluster Casual Talk #2
  • Date: June 25th, 2014
  • Time: 19:00
  • Place: GMO Yours, …

We recently open-sourced our percona-agent and if you check out the source code, you’ll find that it is written in the Go programming language (aka Golang). For those not up to speed, the percona-agent is a real-time client-side agent for Percona Cloud Tools.

Our requirements are quite demanding for our agents. This one is software that works on a real production server, so it must be fast, reliable, lightweight and easy to distribute. Surprisingly enough, binaries compiled by Go fit these characteristics.

There are of course alternatives that we considered. On the scripting side: Perl, Python, PHP, Ruby et al. These are not necessarily fast, and the distribution is also interesting. We have enough experience with …

Percona is glad to announce the release of Percona Toolkit 2.2.8 on June 4th, 2014 (Downloads are available here and from the Percona Software Repositories). This release is the current GA (Generally Available) stable release in the 2.2 series.

New Features:

• pt-agent has been replaced by percona-agent. More information on percona-agent can be found in the Introducing the 3-Minute MySQL Monitor …

MariaDB has plenty of mirrors to download the latest versions of MariaDB. Typically mirrors carry the last couple of releases and the current release, but what if you wanted to access something much older?

You have two resources for the complete archive:

1. http://archive.mariadb.org/ – this is the official archive, but from what I gather, it can be quite slow
2. http://downloads.skysql.com/files/MariaDB/ – SkySQL provides a complete mirror and it is very fast so I would use this instead. 

Current download archives stand at 337GB. But you can …

Using MySQL Sandbox I can install multiple instances of MySQL. It is not uncommon for me to run 5 or 6 instances at once, and in some occasions, I get to have even 10 of them. It is usually not a problem. But today I had an issue while testing MariaDB, for which I needed 5 instances, and I the installation failed after the 4th one. To make sure that the host could run that many servers, I tried installing 10 instances of MySQL 5.6 and 5.7. All at once, for a grand total of 20 instances:

$ make_multiple_sandbox --how_many_nodes=10 5.6.14
installing node 1
installing node 2
installing node 3
installing node 4
installing node 5
installing node 6
installing node 7
installing node 8
installing node 9
installing node 10
group directory installed in $HOME/sandboxes/multi_msb_5_6_14
$ make_multiple_sandbox --how_many_nodes=10 5.7.4 …