There are a few ways of installing mariadb. You can build from source or you can use the mariadb repository.
I personally use the repository as then the system package manager can handle updating etc. I normally find packages on servers that are built from source often get left and never get updated. Also if you are using a vps or limited machine you don’t have to strain the system with compiling.
Add MariaDB repo to your system
apt-get install python-software-properties apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xcbcb082a1bb943db add-apt-repository 'deb http://mirror.i3d.net/pub/mariadb/repo/10.0/debian wheezy main'
Install MariaDB with
apt-get update apt-get install mariadb-server
Useful commands for migrating mysql to mariadb
Backing up mysql databases before migration
mysqldump -u root -p --all-databases > mysqlbackup.sql
mysql -u root -p -Be 'show databases'