Running Multiple Instances of MySQL in CentOS/Fedora/RedHat Linux

              Running Multiple Instances of MySQL in CentOS/Fedora/RedHat Linux

                       1. Make sure that you have installed mysql-server in your Linux , If not install it with

yum install –y mysql-server

              2After installing MySQL-Server , Open your terminal and paste as 
                        mkdir /var/lib/mysql2
chown -R mysql.mysql /var/lib/mysql2
mkdir /var/log/mysql2         
chown -R mysql.mysql /var/log/mysql2

Above code stands for creating two directories for MySQL 2nd instance , There /var/lib/mysql2  for data directory and /var/log/mysql2 is for log directory. After that changing the owner as mysql for both.

              3. Make a dump of mycnf configuration file with 
 cp -R /etc/my.cnf /etc/my2.cnf

                    Then Open it with
nano /etc/my2.cnf  (or ) vim /etc/my2.cnf

                     Make the changes as mentioned in the below file.

                                     # change/add the following options
                                    port = 3307     #different port
                                    datadir = /var/lib/mysql2       #diff data dir
                                    socket =  /var/lib/mysql2/mysql2.sock           # diff socket path
                                    # add [mysql_safe]
                                    log-error = /var/log/mysql2/mysql.log # diff log
                                    pid-file = /var/lib/mysql2/mysql2.pid            #diff PI

 Then save & close it.

                            4.  Now in the terminal paste these lines after one , with success of each command

mysql_install_db --user=mysql --datadir=/var/lib/mysql2/
mysqld_safe --defaults-file=/etc/my2.cnf &
mysqladmin -S  /var/lib/mysql2/mysql2.sock -u root password 'newpass'
mysql -S  /var/lib/mysql2/mysql2.sock -u root -p

5                 5. That will start your MySQL 2ndinstance and you can check it with 

netstat -nptelu | grep my
netstat -l | grep my

6                6. If you want to shutdown that instance then you can do it with

mysqladmin -S  /var/lib/mysql2/mysql2.sock -u root -p shutdown


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