Configuring mysql for multiple instance only Post: 302938304

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Special Forums UNIX and Linux Applications Configuring mysql for multiple instance only Post 302938304 by jcdole on Saturday 14th of March 2015 04:48:19 AM

03-14-2015

Registered User

Configuring mysql for multiple instance only

Hello.
I plan to use mysql with only instance database so I can stop one database for maintenance without stopping every thing.

When one reads through the my.cnf config file, it is not clear if we must use at the same time a single database mysql plus any instances mysqld2 (for app1), mysqld3 (for app2), and so on.

Or may I get rid of the mysqld process and start only mysqld2, mysqld3, ....
I have try that but could not start any instance. Of course I have configured a systemd service file.

Or may I use mysqld1 as mysql database pointing to mysql as first mandatory database and then add more instance when necessary.

here code for mysqld@.service

Code:

[Unit]
Description=MySQL Multi Server for instance %i
After=syslog.target
After=network.target

[Service]
User=mysql
Group=mysql
Type=forking
ExecStart=/usr/bin/mysqld_multi --defaults-file=/etc/mysql/cfg_%i.cnf  --log=/var/log/mysql/mysql_multi.log --verbose  start %i
ExecStop=/usr/bin/mysqld_multi --log=/var/log/mysql/mysql_multi.log  stop %i
#Restart=always
#RestartSec=5
PrivateTmp=true

[Install]
WantedBy=multi-user.target

my config file in /etc/my.cnf

Code:

[client]
port       = 3306
socket     = /bdd/bd_1/sock/mysql_cli.sock

[mysqld_multi]
mysqld     = /usr/bin/mysqld_safe
mysqladmin = /usr/bin/mysqladmin
log        = /var/log/mysqld_multi.log

[mysqld2]
port       = 63332
datadir    = /bdd/bd_2/app2
pid-file   = /bdd/bd_2/app2/mysqld.pid
socket     = /bdd/bd_2/app2/mysql.sock
user       = mysql

[mysqld3]
port       = 63333
datadir    = /bdd/bd_3/app3
pid-file   = /bdd/bd_2/app3/mysqld.pid
socket     = /bdd/bd_2/app3/mysql.sock
user       = mysql

!includedir /etc/my.cnf.d

I would like some advise.

Any help is welcome.

jcdole

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LEARN ABOUT OPENSOLARIS

mysql_zap

zap(1)								  MySQL database							    zap(1)

NAME

       zap - a perl script used to kill processes

USAGE

       /usr/bin/mysql_zap [-signal] [-?Ift] pattern

SYNOPSIS

       zap [-I|-?]  [-f] [-t]

DESCRIPTION

       zap    supports by executing

       -I|-?  info

       -f     force

       -t     test

NOTE

       If  -f isn't given, ask user for confirmation for each process to kill. If signal isn't given, try first with signal 15 and after that with
       signal 9. If -t is given the processes is only shown on stdout.

SEE ALSO

       isamchk(1), isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1), mysqld(1), mysqld_multi(1), mysqld_safe(1), mysqldump(1), mysql_fix_privi-
       lege_tables(1), mysqlshow(1), perror(1), replace(1)

       For  more information please refer to the MySQL reference manual, which may already be installed locally and which is also available online
       at http://www.mysql.com/doc/en/

BUGS

       Please refer to http://bugs.mysql.com/ to report bugs.

AUTHOR

       Ver 1.0, distribution 4.0.24 Michael (Monty) Widenius (monty@mysql.com), MySQL AB (http://www.mysql.com/). This software comes with no war-
       ranty.  Manual  page  by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer (http://www.mercurme-
       dia.com)

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+------------------------------------+
       |  ATTRIBUTE TYPE    |	       ATTRIBUTE VALUE		 |
       +--------------------+------------------------------------+
       |Availability	    | SUNWmysqlr, SUNWmysqlu, SUNWmysqlt |
       +--------------------+------------------------------------+
       |Interface Stability | External				 |
       +--------------------+------------------------------------+
NOTES

       Source for mysql is available on http://opensolaris.org.

MySQL 4.0							 19 December 2000							    zap(1)