Jing,
First: you can have only ONE mysql instance running for each installation,
but you can have as many installations as you want on each server.
So to answer your statement only the first command started mysql,
while the second command should have given you an error(there is already an
instance running).
--:Jing:-------------------------------------------------------------------
And then I started (or, I believe I started) 2 difference instances with:
[EMAIL PROTECTED] etc]# mysqld_safe --defaults-file=/etc/my1.cnf &
[EMAIL PROTECTED] etc]# mysqld_safe --defaults-file=/etc/my2.cnf &
---------------------------------------------------------------------------
If you issue a 'ps -ef | grep mysql' shell command, you'll see all mysql
processes running, for each instance you have two basic processes:
==:ps -ef | grep mysql:====================================================
mysql5 535 513 6 11:48:56 pts/0 0:01 /.../libexec/mysqld
basedir=/data/Esercizio/mysql5015 --......
mysql5 513 367 0 11:48:56 pts/0 0:00 /bin/sh bin/mysqld_safe
===========================================================================
The one with the lower id(513) is the one you started, the other(535) is the
'son' of 513.
Compiling and installing it is surely a good experience.
What I do NOT like of bundled installations is directory/user sharing.
If you install it yourself compiling it from sources you can
choose your directory, user and parameters for a particular mysql installation.
My advice is to follow this procedure:
1) Create a home directory for the user and installation of mysql
e.g.: /home/mysql5018
2) Create a new operating system user for the new installation,
e.g.: mysql5018, mysql323, etc...
3) compile mysql (follow the manual)
4) log on as the new mysql user (e.g.: mysql5018)
5) install mysql (follow the manual) as that user
6) create the .my.cnf file and put it in the home directory of the user
(/home/mysql5018/.my.cnf)
IMPORTANT: watch for right permissions on files and directories.
This way you can start mysql as easy as 'bin/mysqld_safe&' with no command
line parameters at all, given you are logged as the right mysql user(mysql5018)
and the .my.cnf is in his home directory.
This is how I got so far.
Aloha!
Claudio Nanni
-----Messaggio originale-----
Da: toutiao [mailto:[EMAIL PROTECTED]
Inviato: sabato 29 marzo 2008 22.05
A: mysql@lists.mysql.com
Oggetto: Re: R: Multiple instances howto
Nanni,
Thanks for the advices. How to make an installation? I use Fedora Core 8
where MySQL comes with the bundle. Do you think I should download the source
code and compile it and configure it using ./configure?
I did changed the cnf file to have 2 different configurations:
[EMAIL PROTECTED] mysqld]# cat /etc/my1.cnf
[mysqld]
port=33061
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[EMAIL PROTECTED] mysqld]# cat /etc/my2.cnf
[mysqld]
port=33602
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql2.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
[mysqld_safe]
log-error=/var/log/mysqld2.log
pid-file=/var/run/mysqld/mysqld2.pid
And then I started (or, I believe I started) 2 difference instances with:
[EMAIL PROTECTED] etc]# mysqld_safe --defaults-file=/etc/my1.cnf &
[EMAIL PROTECTED] etc]# mysqld_safe --defaults-file=/etc/my2.cnf &
I checked the service status:
[EMAIL PROTECTED] mysqld]# service mysqld status
mysqld (pid 3542 3403) is running...
Does it means I have two instances running? If I want to configure them
seperately using mysql command, what shall I do to distinguish each
instances?
Thanks,
Jing Zhang
Nanni Claudio wrote:
>
> Hi Jing,
>
> Logically speaking,
> you can run as many instances of mysql as you want,
> but you have to make an installation for each mysql instance.
> On each instance you can have as many databases as you want.
> From my experience here is the key:
>
> 1) One different mysql user (mysql41,mysql50) for each mysql installation.
>
> 2) put .my.cnf file in the home directory of each mysql user with the
> right parameters. This is the way I have found not to conflict between
> instances.
> The socket file is a file name you have to assign to each instance,
> Use a different name for each instance.
>
> :-----.my.cnf------------:
> # The MySQL server
> [mysqld]
> port = 3515
> socket = /tmp/mysql5015.sock
> skip-locking
> key_buffer = 256M
> max_allowed_packet = 1M
> :-------------------------:
>
> 3) Of course each mysql instance must bind to a different
> port(3306,3316,3326)
>
>
> Let me know.
>
> Aloha!
>
> Claudio Nanni
>
>
> -----Messaggio originale-----
> Da: toutiao [mailto:[EMAIL PROTECTED]
> Inviato: venerdì 28 marzo 2008 3.03
> A: mysql@lists.mysql.com
> Oggetto: Re: Multiple instances howto
>
>
>
> In addition, can you run multiple instances of mysqld simultaneous?
>
>
>
> toutiao wrote:
>>
>>
>> Dear Friends,
>>
>> I'm learning to create multiple mysqld instances on Linux, where one
>> instance of mysql is already running.
>>
>> While creating a new my.cnf file, I noticed that I need to assign a
>> socket
>> file to it.
>>
>> Can you pls. tell me how to create / test this socket file?
>>
>> Thanks,
>> Jing Zhang
>>
>>
>
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