下载MySQL二进制包到/opt目录，开始安装

卸载mariadb

yum remove mariadb-config mariadb-common mariadb-libs

开始安装MySQL

cd /opt && tar xzf mysql-5.7.18-linux-glibc2.5-x86_64.tar.gz
mv mysql-5.7.18-linux-glibc2.5-x86_64 /usr/local/
groupadd mysql
useradd  -r  -g mysql -s /bin/false mysql
cd /usr/local
ln -s mysql-5.7.18-linux-glibc2.5-x86_64 mysql
chown -R mysql.mysql /usr/local/mysql-5.7.18-linux-glibc2.5-x86_64
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/
mkdir /data/mysql3306
chown -R mysql.mysql /data/mysql3306/
#上传my.cnf配置文件到/etc/下
cd /usr/local/mysql && bin/mysqld --initialize --user=mysql

启动数据库

/etc/init.d/mysql.server start

过滤临时密码

grep "root@localhost:" /data/mysql3306/error.log

修改密码

alter user root@'localhost' identified by '123.com';