Upgrading MariaDB MaxScale from 2.0 to 2.1
This document describes particular issues to take into account when upgrading MariaDB MaxScale from version 2.0 to 2.1.
For more information about MariaDB MaxScale 2.1, please refer to the ChangeLog.
Before starting the upgrade, we strongly recommend you back up your current configuration file.
MaxScale 2.1.2 added support for IPv6 addresses. The default interface that listeners bind to
was changed from the IPv4 address
0.0.0.0 to the IPv6 address
::. To bind to the old IPv4 address,
address=0.0.0.0 to the listener definition.
Persisted Configuration Files
Starting with MaxScale 2.1, any changes made with the newly added
runtime configuration change
will be persisted in a configuration file. These files are located in
MaxScale Log Files
The name of the log file was changed from maxscaleN.log to maxscale.log. The default location for the log file is /var/log/maxscale/maxscale.log.
Rotating the log files will cause MaxScale to reopen the file instead of renaming them. This makes the MaxScale logging facility logrotate compatible.
disable_sescmd_history option is now enabled by default. This means that
slaves will not be recovered mid-session even if a replacement slave is
available. To enable the legacy behavior, add the
parameter to the service definition.
The MariaDB session state is reset in MaxScale 2.1 for persistent connections. This means that any modifications to the session state (default database, user variable etc.) will not survive if the connection is put into the connection pool. For most users, this is the expected behavior.
User Data Cache
The location of the MariaDB user data cache was moved from
Galeramon Monitoring Algorithm
Galeramon will assign the master status only to the node which has a wsrep_local_index value of 0. This will guarantee consistent writes with multiple MaxScales but it also causes slower changes of the master node.
To enable the legacy behavior, add
root_node_as_master=false to the Galera
MaxAdmin Editing Mode
The default editing mode was changed from vim to emacs mode. To start
maxadmin in the legacy mode, use the