Thanks for the documentation, there are some interesting things in there.
I may however have to go further than this and have true autonomous MySQL. Not sharing any /etc/my.cfg. Running everything from some '~' directory:
~/etc/mysql.conf ~/bin/mysql* ~/libexec/mysqld ~/logs/ ~/var/ ~/mysql.sock ~/start.sh ~/stop.sh
(etc)
Therefore having a truely portable service group. This is needed so that I can shunt the service from machine to machine to control load and handle outages.
This bit seems farly simple. As long as I start it up very carefully so as to avoid IP conflicts, read the correct mysql.conf file etc...
But my worry still remains:
I can make MySQL 'autonomous' in this way only to a point. They limit I can see is where external libs are needed. These may conflict if compiled from different versions with the same file name.
I would be interested to know from any member whether this may be the case.
Whether there are any libs MySQL creates which will conflict from different versions. Eg, does 4.0 and 4.1 use different libmysqlclinet.so but have the same file name. Therefore one will work, one will dump :(
Or maybe I can create the libs in my autonomous portable directory:
~/libs/libmysqlclient.so
But many thanks for the documentation, this will be a great start to finding my solution.
Regards,
Ben.
Kevin Cowley wrote:
AS I read the Mysql-multi stuff it works if you have multiple instances of the same version but not different version instances. With different version instances you (may) have differences in mysqld_safe, mysqld itself, and more than likely in the libraries themselves so you need to use the mysqld_safe version that corresponds to the version you want.
Kevin Cowley
R&D
Tel: 0118 902 9099 (direct line)
Email: [EMAIL PROTECTED]
Web: http://www.alchemetrics.co.uk
-----Original Message----- From: Dean, Michael L USAATC [mailto:[EMAIL PROTECTED] Sent: 11 February 2005 15:07 To: 'mysql@lists.mysql.com' Subject: RE: Two versions of MySQL on same machine
This site may actually help out more: http://dev.mysql.com/doc/mysql/en/mysqld-multi.html
-----Original Message----- From: Kevin Cowley [mailto:[EMAIL PROTECTED] Sent: Friday, February 11, 2005 9:58 AM To: mysql@lists.mysql.com Subject: RE: Two versions of MySQL on same machine
You need to install each version into its own directory/path structure
-
if you have a default install of Mysql then you also need to take this
into
account.
For each version you need to setup a my.cnf and if you want full separation different database directories. In the my.cnf you specify different ports/sockets.
For any given user you then need to ensure they pickup the correct binaries and libraries(if they're building applications).
If you're auto starting Mysql at boot you either need to write a
script
which provides each version separately or write a generice script
which
finds and starts/stops/shutsdown each installed version.
Then you'll need to work out migrations strategies, user admin between versions, etc.
Welcome to the world of system/database admin.
Kevin Cowley R&D
Tel: 0118 902 9099 (direct line) Email: [EMAIL PROTECTED] Web: http://www.alchemetrics.co.uk
-----Original Message----- From: Ben Clewett [mailto:[EMAIL PROTECTED] Sent: 11 February 2005 14:12 To: mysql@lists.mysql.com Subject: Two versions of MySQL on same machine
Dear MySQL,
I require two versions of MySQL on the same machine.
[Specifically part of an HACMP array where services are portable and move from server to server, using AIX 5.1].
The machine I have will have to support MySQL 4.0.11 and 4.1.8.
I have three questions:
1. Are there any server libs?
I can see these on a Linux box, none of which look like server libs,
so
I might be lucky?
librt.so.1 libz.so.1 libdl.so.2 libpthread.so.0 libcrypt.so.1 libnsl.so.1 libm.so.6 libc.so.6
2. If there are and server libs, will the server libs conflict
between
the two versions?
2. If they conflict, is there a way of compiling MySQL to it's
specific
libs from the standard package, without static compilation?
Any help, however honest or candied, would be extremely useful.
Regards,
Ben Clewett.
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