centos7下安装mysql

1.下载mysql的repo源

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm

2.安装mysql-community-release-el7-5.noarch.rpm包

sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm

安装这个包后，会获得两个mysql的yum repo源：
/etc/yum.repos.d/mysql-community.repo
/etc/yum.repos.d/mysql-community-source.repo。

3.安装mysql

sudo yum install mysql-server

根据提示安装就可以了,不过安装完成后没有密码,需要重置密码

4.重置mysql密码

mysql -u root

登录时有可能报这样的错：ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2)，原因是/var/lib/mysql的访问权限问题。下面的命令把/var/lib/mysql的拥有者改为当前用户：

sudo chown -R root:root /var/lib/mysql

重启mysql服务

service mysqld restart

接下来登录重置密码：

mysql -u root mysql > use mysql;mysql > update user set password=password('123456') where user='root';mysql > exit;service mysqld restart