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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pmdamysql

PMDAMYSQL(1)						       Performance Co-Pilot						      PMDAMYSQL(1)

NAME

       pmdamysql - MySQL database PMDA

DESCRIPTION

       pmdamysql is a Performance Co-Pilot PMDA which extracts live performance data from a running MySQL database.

INSTALLATION

       pmdamysql uses a configuration file from (in this order):

       o   /etc/pcpdbi.conf

       o   $PCP_PMDAS_DIR/mysql/mysql.conf

       This file can contain overridden values (Perl code) for the settings listed at the start of pmdamysql.pl, namely:

       o   database name (see DBI(3) for details)

       o   database user name

       o   database pass word

       Once this is setup, you can access the names and values for the mysql performance metrics by doing the following as root:

	       # cd $PCP_PMDAS_DIR/mysql
	       # ./Install

       If you want to undo the installation, do the following as root:

	       # cd $PCP_PMDAS_DIR/mysql
	       # ./Remove

       pmdamysql is launched by pmcd(1) and should never be executed directly.	The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

Binary Status values in text
       Some of the status values are in the form of YES/NO or ON/OFF.

       Since these cannot be intepreted by tools like PMIE, they have been duplicated with a _num extension and the values of 1 (YES/ON) or 0
       (NO/OFF).

   Eg:
       o   mysql.slave_status.slave_io_running

       o   mysql.slave_status.slave_io_running_num

FILES

       /etc/pcpdbi.conf
	   configuration file for all PCP database monitors

       $PCP_PMDAS_DIR/mysql/mysql.conf
	   configuration file for pmdamysql

       $PCP_PMDAS_DIR/mysql/Install
	   installation script for the pmdamysql agent

       $PCP_PMDAS_DIR/mysql/Remove
	   undo installation script for the pmdamysql agent

       $PCP_LOG_DIR/pmcd/mysql.log
	   default log file for error messages from pmdamysql

SEE ALSO

       pmcd(1), pmdadbping.pl(1) and DBI(3).  # vi: sw=4 ts=4 et:

3.8.10							       Performance Co-Pilot						      PMDAMYSQL(1)