Yum Repo error

[acidjunk]

When I try to run "vagrant up" it configures the hosts correct but all yum install command fail:

fatal: [postgres-1]: FAILED! => {"changed": true, "failed": true, "msg": "Error: Cannot find a valid baseurl for repo: base\n", "rc": 1, "results": ["Loaded plugins: fastestmirror\nDetermining fastest mirrors\nYumRepo Error: All mirror URLs are not using ftp, http[s] or file.\n Eg. 6.5 is not a valid and current release or hasnt been released yet/\nremoving mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6.5/base/mirrorlist.txt\n"]

[acidjunk]

Doing
sudo echo "6" > /etc/yum/vars/releasever
inside a VM fixes it.