Building Galera Replication from Scratch

Introduction

MySQL/Galera synchronous Multi-Master Replication consists of 2 parts:

• The wsrep patches for MySQL (codership-mysql) and
• the Galera Replication Plugin (galera).

If you do not want to download the prepared binaries you can build it on you own.
First you have to download the native MySQL sources, then patch it with the Galera wsrep patches and compile it. In a second step you have to build the Galera Plugin.

This is especially useful because in the standard Galera binary tar balls the garbd (and possibly other tools) is not provided.

The following steps describe how to do it:

Prepare a patched MySQL

Download MySQL Sources

Download the normal MySQL source code:

wget http://mirror.switch.ch/ftp/mirror/mysql/Downloads/MySQL-5.5/mysql-5.5.15.tar.gz

Download wsrep Patch

Download the wsrep Patch for MySQL:

wget http://launchpad.net/codership-mysql/5.5/5.5.15-21.2/+download/mysql-5.5.15-wsrep_21.2.patch

Patch MySQL

Patch MySQL as follows:

cd /tmp
tar xf /download/mysql-5.5.15.tar.gz
cd mysql-5.5.15
patch -p1 < /download/mysql-5.5.15-wsrep_21.2.patch

If you want avoid this step you can also download the already patched codership-mysql directly as follows:

bzr branch lp:codership-mysql

or

bzr branch lp:codership-mysql/5.5

If you want to do create your own wsrep patch:

bzr branch lp:codership-mysql/5.5
cd 5.5
bzr diff -p1 -v --diff-options " --exclude=.bzrignore " -r tag:mysql-5.5.15..branch:lp:codership-mysql/5.5 <br>
  > mysql-5.5.15-wsrep_21.2.patch

Compile MySQL with the wsrep patch

To compile the patched MySQL do the following:

chmod a+x BUILD/compile-amd64-wsrep
BUILD/compile-amd64-wsrep --prefix=/home/mysql/product/mysql-5.5.15-wsrep-21.2
make install

Up to here this was the first step to get a prepared MySQL working with wsrep. Now we have to make the Galera Plugin…

Prepeare the Galera Replication Plugin

Download Galera Replication Plugin

The source of the Galera Replication Plugin you can get like this:

wget http://launchpad.net/galera/1.x/21.1.0/+download/galera-21.1.0-src.tar.gz

or if you want to get the most recent source take if directly from launchpad:

bzr branch lp:galera/1.x

Compile the Galera Replication Plugin

cd /tmp/
tar xf /download/galera-21.1.0-src.tar.gz
cd galera-21.1.0-src/
scons

cp garb/garbd /home/mysql/product/mysql-5.5.15-wsrep-21.2/bin/
cp libgalera_smm.so /home/mysql/product/mysql-5.5.15-wsrep-21.2/lib/plugin/

This is the whole magic. The most difficult thing is to put everything in the right order and to get the right packages in place (for Ubuntu/Debian: libboost-dev, libboost-program-options-dev (
>= v1.41), scons, libssl-dev, check, g++ (
>= 4.4.0), etc.).