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MariaDB Galera Cluster is a synchronous multi-master cluster for MariaDB. It is available on Linux only, and only supports the XtraDB/InnoDB storage engines (although there is experimental support for MyISAM - see the wsrep_replicate_myisam system variable).

Starting with MariaDB 10.1, the wsrep API for Galera Cluster is included by default. This is available as a separate download for MariaDB 10.0 and MariaDB 5.5.

MariaDB has one of the best and easiest solutions to do a Master-Master replication: Galera. Galera uses WSREP, which it is responsible for maintaining all the Database nodes in the cluster in sync. This means, after changing one record on node A, it is just a matter of seconds to see the change on node B.

I will talk in this article how I did this configuration using MariaDB 10.1.x. Remember you can install MariaDB under Centos 6 and 7 by using OKay's repository.

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If you like me, and you have a lot of free disk space then it is a good idea to make money by farming it. Farming is the term we are going to use when you are renting your free space to others. Currently, for some happy reasons, I have 7 TB I can rent. In this article, I will show how to rent your space. Once you get your SIA Coins (SC), it is up to you to trade them.

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Everyone knows that CentOS only takes care of some specific core packages. All others, if you want to continue using RPM's, must be used from alternative Repositories. There are many alternatives:

  • EPEL: you will find here many useful packages. Packages get updates for critical bugs.
  • Remi: you will find here backports for most useful packages. 
  • OKay: you will find here some specific packages for servers, audio, and video.

I especially do contributions to the OKay repository. So, if you want to use OKay follow these steps:

  • Install the EPEL repository, you may try typing yum install epel-release. I think at least Centos 7 has it out of the box.
  • Install the okay-release RPM. Type:
    • Centos 6 on 32 bits: rpm -ivh http://repo.okay.com.mx/centos/6/i386/release/okay-release-1-1.noarch.rpm?
    • Centos 6 on 64 bits: rpm -ivh http://repo.okay.com.mx/centos/6/x86_64/release/okay-release-1-1.noarch.rpm?
    • Centos 7 on 64 bits: rpm -ivh http://repo.okay.com.mx/centos/7/x86_64/release/okay-release-1-1.noarch.rpm?

I will post later as I publish some updates or packages.