** 2018-05-30 OBSOLETE **
This #howto is obsoleted by this new feature
https://github.com/NethServer/dev/issues/5505
Refer to the Software center section of the administrator’s guide for more information
http://docs.nethserver.org/en/v7/packages.html
NethServer and CentOS package updates are stable and well tested, but when a new upstream version occurs something can break suddenly, expecially if automatic updates are applied with no human supervision! 
WARNING
- This procedure must be avoided in Subscription and Enterprise
installations (they are already supervised)! - Human supervision of automatic updates is required in any case!
Sometimes you may need to lock the server to a specific release, like 7.4.1708. For instance, you enabled automatic updates but do not want to update automatically when a new CentOS/NethServer minor version is available.
This #howto does not include the following upstream repositories, because they do not provide minor version paths, like 7.4.1708. They just provide 7, so a human supervision of the automatic updates is required in any case:
- EPEL
- SCL
The procedure is available here
”