Upgrade/Update from mariadb 5.5 to 10

Question 1

We have recently been through that exact upgrade, also on CentOS. We experienced no trouble at all with any of our databases, all using the InnoDB engine. I have enclosed our internal upgrade how-to, this may save you some time and show you which path we took.

This guide assumes you are running the AMD64 versjon og CentOS 6.

Create a yum repo file for MariaDB and name it /etc/yum.repos.d/MariaDB.repo

[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.0/centos6-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1

// The signing key value is 0x1BB943DB.

Uninstall current MariaDB server and client. If yum was used to install them, use:

yum remove mysql MySQL-server MySQL-shared MySQL-shared-compat

This should uninstall all packages depending on MariaDB/MySQL, and consequently requires you to reinstall php-mysql as described below. Any other packages depending on MySQL will also have to be reinstalled, so keep an eye out for this.

Install MariaDB

yum install MariaDB-server MariaDB-client

Reinstall PHPs MySQL lib

yum install php-mysql

Start MariaDB, update data files and restart Apache

service mysql start  
mysql_upgrade 
service httpd restart

Consider rebooting to test that all works as desired.

Question 2

Upgrade from version 5.5 to 10.0.12 was very smooth. All user databases and local accounts were automatically restored after the upgrade..

+-----------------+ | @@version | +-----------------+ | 10.0.12-MariaDB |

Note: You might need to restart the CentOS host if you notice a connection error:

Question 3

If you configured your root access to MySQL/MariaDB with a password, you need to use the -p option when you want to use mysql_upgrade.