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Do you know any 'Debian way' of setting up multiple MySQL instances on a single server? The server would receive data replicated from multiple remote databases.

I could use scripts like mysqlsandbox but I prefer to stick to Debian packages and would like to be able to upgrade the setup without much complications in the future. Another solution is mysqlmanager - it works with MySQL 5.1 but it's deprecated and not released anymore with 5.5.

So what's the 'best practice' of running multiple MySQL instances on a single debian server?

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up vote 10 down vote accepted

I believe it's as simple as running mysqld_multi and setting up your my.cnf correctly. mysqld_multi is a part of the mysql distribution - not a packaged frill.

There is a patch to make /usr/share/mysql/mysqld_multi.server appropriate for use in /etc/init.d and another patch to make mysqld_multi use files in /etc/mysql/conf.d.

You can initialize MySQL data directories for new instances with the mysql_install_db command like this:

mysql_install_db --datadir=/var/lib/mysql2

Don't forget to change the root password of the newly created instance:

mysqladmin --port 3307 --user=root password 'new-password'
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thanks; do you use it in practice? any horror stories/hints? – pQd Mar 10 '12 at 13:15
My horror story is a 2 days long data recovery because of debian's mysql init script was not shutting down gracefully the mysql because shutdown took too long. Since then i do not use debian mysql package, only Percona's binary distribution and the initscript in it – Gabor Vincze Mar 10 '12 at 14:58
@GaborVincze - was it in mysqld_multi setup or 'regular' single-mysql-instance installation? – pQd Mar 10 '12 at 16:37
It was a regular installation. An 5.1 – Gabor Vincze Mar 10 '12 at 19:06
I do use mysqld_multi in practice. The hardest part is that you have to use mysqld_multi/mysqladmin to start/shut down the instances versus /etc/init.d/mysqld restart - there's not a terrible lot of pre-canned scripts that make it easy. Once you master it, it becomes old hat and is a very convenient way to spin up an instance for say, recovery, delayed replication - whatever. – thinice Mar 10 '12 at 22:00

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