rpm -qa | grep mysql若查询有结果，需删除
rpm -e --nodeps mysql-libs-xxx删除相关mysql目录并删除查询mysql目录
find / -name mysql查询mysql命令
whereis mysql下载mysql二进制包进入/user/local/src/
cd /user/local/src/下载mysql
wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.37-linux-glibc2.12-x86_64.tar.gz解压
tar -zxvf mysql-5.7.37-linux-glibc2.12-x86_64.tar.gz构建mysql目录创建mysql BaseDir
mkdir -p /usr/local/mysql/data移动mysql文件至BaseDir
mv mysql-5.7.37-linux-glibc2.12-x86_64/* /usr/local/mysql/初始化mysql用户创建mysql用户、创建用户组并将mysql加入mysql用户组
groupadd mysql useradd -r -g mysql mysql改变mysql目录所属组和所属用户
chown -R mysql:mysql /usr/local/mysql赋予mysql用户及用户组对mysql目录对最大访问权限
chmod +775 /usr/local/mysql安装mysql初始化mysql，需要保存以下命令输出后的最后一段的临时密码，至关重要！
sh /usr/local/mysql/bin/mysqld --initialize --user=mysql --datadir=/usr/local/mysql/data --basedir=/usr/local/mysql启动mysql
/usr/local/mysql/support-files/mysql.server start添加软连接，并重启mysql服务
ln -s /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql service mysql restart登陆mysql
mysql -u root -p 刚刚的保存的临时密码输入以下sql语句，修改root用户密码
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456' PASSWORD EXPIRE NEVER;远程访问
use mysql; update user set user.Host='%' where user.User='root';允许root用户在任何地方进行远程登录，并具有所有库任何操作权限
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;刷新权限
FLUSH PRIVILEGES;设置mysql系统服务复制mysql服务并赋予执行权限
cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysqld chmod +x /etc/init.d/mysqld添加mysql系统服务
chkconfig --add mysqld
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