Hey! FYI I see many failures on CentOS 7 (and other Enterpriseⓡ™ Linux) on package installation: "One of the configured repositories failed (Unknown), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this:" followed by a list of workarounds and finally "Cannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again".