CentOS 7.0 based VPSies will not contain mysql-server yum package. This is because in CentOS release 7.0 it has been replaced by MariaDB, a successful fork from MySql.
For interested parties, MySQL folks have created a special repository for RHEL5/6/7 based platforms as well Fedora 20 and 21.
The following two links will provide all necessary information to install MySql server in Centos 7:
You can actually try this database installation on our platform in few minutes utilizing our PCS (Private Cloud Solution) which allows you to have VPSie(s) on a private network – NAT – Port forward – traffic control for inbound and outbound – multiple gateway IPs which you could use for the load-balancing and failover.