A NethServer system is constituted by RPMs that come mainly from CentOS mirrors and NethServer mirrors.

CentOS releases errata and bug fixes recompiling RHEL packages, as reported by the centos-announce mailing list, and released inside upstream mirrors. NethServer does the same, announcing new releases of its specific RPMs on

A NethServer machine fetches:

  • CentOS security updates from an URL like:$releasever/updates/$basearch/
  • NethServer updates from an URL like:$releasever/updates/$basearch/

Where $releasever is currently 7, and $basearch is x86_64.

All those packages updates improve the original system release by pushing it forward, like rolling continuously.

When CentOS produces a new minor version like 6.7 they publish a new “minimal” ISO image. The NethServer developers add a small RPM set on that image together with a kickstart file. The resulting image is the NethServer ISO, with installer, server-manager and other stuff.

When NethServer 7.4 is released, any existing 7.3 installation can be upgraded seamlessly, because both CentOS and NethServer ensure compatibility between minor releases.

Disabling rolling release

Sometime you may need to point a server to a specific release only for testing purpose.


Add the specific release to /etc/yum/vars/nsrelease file.


echo 7.3.1611 > /etc/yum/vars/nsrelease


  1. Open /etc/yum.repos.d/CentOS-Base.repo
  2. Comment the line containing mirrorlist=
  3. Un-comment the line containing baseurl=
  4. Substitute baseurl value with a URL pointing to vault. Eg: