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参考：https://www.linode.com/docs/databases/mysql/how-to-install-mysql-on-centos-7
centos 7上没有办法使用yum install mysql等命令了：
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm yum update sudo yum install mysql-server sudo systemctl start mysqld
完毕。
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原文地址：http://www.cnblogs.com/zl0372/p/mysql_centos7.html
