Comments on: Running multiple instances of MySQL on the same machine

By: Arthur N. Ketcham

Arthur N. Ketcham — Thu, 03 Jun 2010 20:09:05 +0000

In Ubuntu 10.04, paths allowed access by mysql is “secured” with apparmor. This has the effect of causing the mysql_install_db operation to fail. I’d detailed how to fix this quickly in this ubuntu forums post: http://ubuntuforums.org/showpost.php?p=9405790&postcount=6

By: Rizqi

Rizqi — Sat, 17 Apr 2010 10:31:25 +0000

Thank you for this post. Iam going to setup replication mysql on same server. This post really help a lot!!

By: almost effortless » Weekly Digest, 1-25-09

almost effortless » Weekly Digest, 1-25-09 — Tue, 30 Mar 2010 15:54:45 +0000

[...] Running multiple instances of MySQL on the same machine | MDLog:/sysadmin As you phase MySQL out of your life, you may find that you want to centralize all your legacy MySQL db's (e.g. your 4.x MySQL db that you can't upgrade and your current 5.x that you don't want chewing up resources on your production machines and that 5.1.x that you had to install in order to make it clear to your superiors that MySQL was dead) on a single machine. This is a good guide to getting started on that. [...]

By: - Marius -

- Marius - — Mon, 22 Feb 2010 16:28:08 +0000

@d.bilbao: it should work the same as on different machines. Just be sure to use the proper MASTER_PORT if needed.

By: d.bilbao

d.bilbao — Sun, 21 Feb 2010 12:26:00 +0000

How to setup a replication server on same hos running to instances of mysql?
any idea?

By: - Marius -

- Marius - — Wed, 16 Dec 2009 00:02:06 +0000

@Andrew: thank you for your addition to the post.

By: Andrew Pimlott

Andrew Pimlott — Fri, 11 Dec 2009 23:30:00 +0000

I took this a little further by integrating it with the debian init.d script, which includes some maintenance tasks done under the mysql user debian-sys-maint. I basically pulled out the parts of the dpkg .postinst script that set this up. You can get the debian-sys-maint from /etc/mysql/debian.cnf. Here is a summary of what I did (I called my second instance mysql.replica instead of mysql2):

– sudo mkdir /var/lib/mysql.replica
sudo chown mysql.mysql /var/lib/mysql.replica
– cp -r /etc/mysql /etc/mysql.replica
edit paths, port (3307)
– cp /etc/init.d/mysql /etc/init.d/mysql.replica
edit paths
add –defaults-file=/etc/mysql.replica/my.cnf to mysqld_safe
add –defaults-file=/etc/mysql.replica/my.cnf to mysqld
– mysql_install_db –user=mysql –datadir=/var/lib/mysql.replica
– /etc/init.d/mysql.replica start
– mysql –defaults-file=/etc/mysql.replica/my.cnf -u root
ALTER TABLE user CHANGE password Password varchar(41) collate utf8_bin NOT NULL default ”;
UPDATE user SET password=PASSWORD(“”) WHERE user=’root’;
FLUSH PRIVILEGES;
REPLACE INTO user SET
host=’localhost’, user=’debian-sys-maint’, password=password(”),
Select_priv=’Y', Insert_priv=’Y', Update_priv=’Y', Delete_priv=’Y',
Create_priv=’Y', Drop_priv=’Y', Reload_priv=’Y', Shutdown_priv=’Y',
Process_priv=’Y', File_priv=’Y', Grant_priv=’Y', References_priv=’Y',
Index_priv=’Y', Alter_priv=’Y', Show_db_priv=’Y', Super_priv=’Y',
Create_tmp_table_priv=’Y', Lock_tables_priv=’Y', Execute_priv=’Y',
Repl_slave_priv=’Y', Repl_client_priv=’Y';
– update-rc.d mysql.replica defaults 19 21

The second instance can now be started and stopped (and will start automatically at boot) just like the primary instance.

By: i.ndustrio.us » links for 2009-10-29

i.ndustrio.us » links for 2009-10-29 — Thu, 29 Oct 2009 23:08:38 +0000

[...] Running multiple instances of MySQL on the same machine | MDLog:/sysadmin This entry was written by delicious and posted on October 29, 2009 at 3:08 pm and filed under links. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL. [...]

By: i.ndustrio.us » Installing mysqlslap on a MediaTemple DV w/CentOS5

i.ndustrio.us » Installing mysqlslap on a MediaTemple DV w/CentOS5 — Wed, 28 Oct 2009 00:18:34 +0000

[...] Creating a 2nd MySQL Instance Very simple and straightforward. Follow these instructions on ducea.com. [...]

By: Matthias

Matthias — Mon, 26 Oct 2009 18:29:02 +0000

If anyone is trying this and receive this result when installing the 2nd database:
ERROR: 1005 Can’t create table ‘db’ (errno: 13)

although all the permissions are correct … take a look into your /var/log/syslog … it is possible, that apparmor is installed and blocks any r/w access from mysqld outside its default directories …

You have to update the apparmor configuration /etc/apparmor.d/usr.sbin.mysqld – and restart apparmor!

regards