一、目的

　　简化安装mysql的安装过程，局限很大，仅支持centos7.6上安装mysql5.5.60，如果想在其他版本的操作系统安装mysql，请自行修改有关变量。

　　如果想了解mysql安装的具体过程，请参考以下链接，写的非常详细！

　https://blog.csdn.net/qq_35197601/article/details/83542498

二、限制性

1、操作系统版本centos7.6

2、mysql的版本mysql5.5.60（mysql安装包：mysql-5.5.60-linux-glibc2.12-x86_64.tar.gz）。

二、脚本内容

1、到mysql官网下载相应版本的mysql包（mysql的包要求和脚本里面的一致，否则请自行修改该变量）

2、上传mysql_install.sh脚本和mysql安装包到/root目录，并执行脚本bash mysql_install.sh，即可！ 

#!/bin/bash
#write by huangsonghai,Simplify mysql installation
#V1.0
#2021-11-17

#step1、卸载系统的mariadb,创建mysql账户
echo -e "\033[31m myslq开始自动化安装，安装需要2-3分钟... \033[0m"
rpm -e --nodeps `rpm -qa|grep mariadb`
systemctl stop firewalld.service
systemctl disable firewalld.service
groupadd mysql
useradd -g mysql mysql

#step2、定义变量
package_way=/home/soft
mkdir -p $package_way
mysql_soft=`ls /root |grep mysql-5.5.60`

#step3、解压软件包到指定位置
tar -zxvf /root/$mysql_soft -C $package_way

tmp1=`ls $package_way`
mv $package_way/$tmp1 $package_way/mysql

#step4、开始安装mysql
cp $package_way/mysql/support-files/my-medium.cnf /etc/my.cnf
sed -i '/myisam_sort_buffer_size/a\'basedir=/home/soft/mysql'' /etc/my.cnf
sed -i '/myisam_sort_buffer_size/a\'datadir=/home/soft/mysql/data'' /etc/my.cnf
chown -R mysql:mysql $package_way/mysql/
$package_way/mysql/scripts/mysql_install_db --user=mysql --basedir=/home/soft/mysql/ --datadir=/home/soft/mysql/data/
chown -R mysql:mysql $package_way/mysql/data
chown 777 /etc/my.cnf
cp $package_way/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld
chmod +x /etc/rc.d/init.d/mysqld
chkconfig --add mysqld
echo "export PATH=$PATH:/home/soft/mysql/bin" >> ~/.bash_profile && source ~/.bash_profile
service mysqld start

#step5、修改mysql信息
echo -e "\033[31m Mysql密码为空，请点击Enter键进入mysql: \033[0m"
mysql -uroot -p -e "
use mysql;
update user set password=password('123456') where user='root' and host='localhost';
flush privileges;
exit
"

#step6、重启mysql
service mysqld restart
service mysqld status
num=`echo $?`
if [ $num -eq 0 ];then
    echo -e "\033[32m mysql install successful \033[0m"
else
    echo -e "\033[32m mysql install not successful,please check! \033[0m"
fi