在新版本的CentOS7中,默认的数据库已更新为了Mariadb,而非 MySQL,所以执行 yum install mysql 命令只是更新Mariadb数据库,并不会安装 MySQL
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
4. 安装mysql-community-release-el7-5.noarch.rpm包
rpm -ivh mysql-community-release-el7-5.noarch.rpm
systemctl start mysqld.service #启动 mysql
systemctl restart mysqld.service #重启 mysql
systemctl stop mysqld.service #停止 mysql
systemctl enable mysqld.service #设置 mysql 开机启动
mysql> update user set password=PASSWORD("这里输入root用户密码") where User='root';
mysql> flush privileges; #重新加载权限
mysql> GRANT ALL PRIVILEGES ON *.* TO root@"%" IDENTIFIED BY "123456";