[2016-07-25: This information is no longer valid, header over to https://codemonkey.net/suricata-rpms/ for up to date links.]
I’ve taken the Suricata package as found in Fedora and rebuilt it for CentOS 7. This should be similar to how the package would exist in EPEL (and hopefully it makes its way there).
To get the package with yum, first install the yum repository package (note: you must already have EPEL installed):
rpm -Uvh http://codemonkey.net/files/rpm/suricata/el7/suricata-release-el-7-1.el7.noarch.rpm
then install Suricata:
yum install suricata
To just get the package, head over to http://codemonkey.net/files/rpm/suricata/el7/.