CentOS 7的yum源中貌似没有正常安装mysql时的mysql-sever文件，需要去官网上下载
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# wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
# rpm -ivh mysql-community-release-el7-5.noarch.rpm
# yum install mysql-community-server
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成功安装之后重启mysql服务
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# service mysqld restart
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初次安装mysql是root账户是没有密码的
设置密码的方法
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# mysql -uroot
mysql> set password for ‘root’@‘localhost’ = password('mypasswd');
mysql> exit
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搞定！