All of our wikis (except the 40m one which unfortunately got turned into ligo.org mess) use DokuWiki. This now has an auto-upgrade feature through the Admin web interface.
I tried this recently and it fails with this message:
DokuWiki 2018-04-22a "Greebo" is available for download.
You're currently running DokuWiki Release 2017-02-19e "Frusterick Manners".
New DokuWiki releases need at least PHP 5.6, but you're running 5.4.16. You should upgrade your PHP version before upgrading!
So we'll have to wait until SL7 (which is what NODUS is running).
I DID do a 'yum upgrade' which updated all the packages. I also installed yum-cron so that the RPM listings get updated daily. But sadly, SL7 only has PHP 5.4.16 (which is a June 2013 release):
> Package php-5.4.16-43.el7_4.1.x86_64 already installed and latest version