1.1 MySQL实例---多实例配置

1.1.1 多实例概述

多套后台进程+线程+内存结构

多个端口，多个配置文件，多个日志文件，多个socket，多个server_id

多套数据

##PS:安装多实例前，首先确保MySQL数据库已安装，mysql安装参考：https://blog.51cto.com/zhuzhiwei/2140683

1.1.2 准备多套配置文件

mkdir -p /data/330{7..9}           #<=====创建多个目录

================第一个实例===================

vim /data/3307/my.cnf

[mysqld]

basedir=/application/mysql

datadir=/data/3307/data

socket=/data/3307/mysql.sock

log-error=/data/3307/mysql.log

log-bin=/data/3307/mysql-bin

server-id=7

port=3307

[client]

socket=/data/3307/mysql.sock

================第二个实例===================

vim /data/3308/my.cnf

[mysqld]

basedir=/application/mysql

datadir=/data/3308/data

socket=/data/3308/mysql.sock

log-error=/data/3308/mysql.log

log-bin=/data/3308/mysql-bin

server-id=8

port=3308

[client]

socket=/data/3308/mysql.sock

================第三个实例===================

vim /data/3309/my.cnf

[mysqld]

basedir=/application/mysql

datadir=/data/3309/data

socket=/data/3309/mysql.sock

log-error=/data/3309/mysql.log

log-bin=/data/3309/mysql-bin

server-id=9

port=3309

[client]

socket=/data/3309/mysql.sock

=========================================

chown -R mysql.mysql /data/330*      #<======将3个目录授权给mysql用户

1.1.3 初始化多套数据

/application/mysql/scripts/mysql_install_db --user=mysql --basedir=/application/mysql --datadir=/data/3307/data

=================================================================================

/application/mysql/scripts/mysql_install_db --user=mysql --basedir=/application/mysql --datadir=/data/3308/data

=================================================================================

/application/mysql/scripts/mysql_install_db --user=mysql --basedir=/application/mysql --datadir=/data/3309/data

=================================================================================

1.1.4 启动多个实例

mysqld_safe --defaults-file=/data/3307/my.cnf &

====================================================================

mysqld_safe --defaults-file=/data/3308/my.cnf &

====================================================================

mysqld_safe --defaults-file=/data/3309/my.cnf &

====================================================================

1.1.5 启动失败处理

touch /data/3309/mysql.log

touch /data/3308/mysql.log

touch /data/3307/mysql.log

chown -R mysql.mysql /data/330*

再次启动多个实例即可。

===============进入实例===============================

mysql  -s   /data/3307/mysql.sock    #首次进入无密码

mysql  -s   /data/3308/mysql.sock

mysql  -s   /data/3309/mysql.sock