从官网上下载mysql安装包mysql-5.7.26-1.el7.x86_64.rpm-bundle.tar

解压文件：tar -xvf mysql-5.7.26-1.el7.x86_64.rpm-bundle.tar

本地安装 comm client libs libs-compat dev server 根据实际安装环境安装其他缺失的包yum localinstall mysql-community-libs-5.7.26-1.el7.x86_64.rpm mysql-community-libs-compat-5.7.26-1.el7.x86_64.rpm mysql-community-common-5.7.26-1.el7.x86_64.rpm mysql-community-client-5.7.26-1.el7.x86_64.rpm mysql-community-devel-5.7.26-1.el7.x86_64.rpm mysql-community-server-5.7.26-1.el7.x86_64.rpm

初始化mysql mkdir /udata/mysql chown mysql:mysql /udata/mysql修改/etc/my.cnfdatadir=/udata/mysql 如果修改了socket的位置务必[client] 加上socket 对应的位置myqld --initialize 并查看mysql生成的随机密码 ，默认位于 /var/log/mysqld.log中

启动mysql服务systemctl enable mysqldsystemctl start mysqld

mysql-uroot -p上诉随机密码连接到mysqlset password = password('xxx') 修改密码 xxx为修改后的密码

update user set host = '%' where host='localhost';flush privileges允许其他主机远程连接mysql