linux 之 mysql多实例实现演练

1、 实战案例：CentOS 7 实现MySQL的多实例

实验目的 CentOS 7.7 yum安装mariadb并实现三个实例
1.安装mariadb
yum install mariadb-server
Systemctl start mariadb

2.准备三个实例的目录
mkdir -pv /mysql/{3306,3307,3308}/{data,etc,socket,log,bin,pid}
chown -R mysql.mysql /mysql
3. 生成数据库文件
mysql_install_db --datadir=/mysql/3306/data --user=mysql
mysql_install_db --datadir=/mysql/3307/data --user=mysql
mysql_install_db --datadir=/mysql/3308/data --user=mysql
4. 准备配置文件
cp /etc/my.cnf /mysql/3306/etc/
vim /mysql/3306/etc/my.cnf
port=3306
datadir=/mysql/3306/data/
socket=/mysql/3306/socket/mysql.sock
[mysqld_safe]
log-error=/mysql/3306/log/mariadb.log
pid-file=/mysql/3306/pid/mariadb.pid

重复上面步骤设置3307，3308

5. 准备启动脚本
   vim /mysql/3306/bin/mysqld
   
   

!/bin/bash

port=3306
mysql_user="root"
mysql_pwd="magedu"
cmd_path="/usr/bin"
mysql_basedir="/mysql"
mysql_sock="${mysql_basedir}/${port}/socket/mysql.sock"
function_start_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "Starting MySQL...\n"
${cmd_path}/mysqld_safe --defaults-file=${mysql_basedir}/${port}/etc/my.cnf &> /dev/null &
else
printf "MySQL is running...\n"
exit
fi
}
function_stop_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "MySQL is stopped...\n"
exit
else
printf "Stoping MySQL...\n"
${cmd_path}/mysqladmin -u ${mysql_user} -p${mysql_pwd} -S ${mysql_sock} shutdown
#${cmd_path}/mysqladmin -u ${mysql_user} -S ${mysql_sock} shutdown
fi
}
function_restart_mysql()
{
printf "Restarting MySQL...\n"
function_stop_mysql
sleep 2
function_start_mysql
}
case $1 in
start)
function_start_mysql
;;
stop)
function_stop_mysql
;;
restart)
function_restart_mysql
;;
*)
printf "Usage: ${mysql_basedir}/${port}/bin/mysqld {start|stop|restart}\n"
esac

6.测试启动3306实例


7.停止服务



登录测试
mysqladmin -uroot -S /mysql/3306/socket/mysql.sock password 'magedu' #加上新口令
mysql -uroot -pmagedu -S /mysql/3306/socket/mysql.sock



重复上述过程，分别建立3307，3308的启动脚本
到此演示完毕