Like Rick, I try to document all changes to my various servers and Moodle installs, and do it similar to Ken, but use books instead of page resources and plain text files.
I have one private Moodle install with a "Installation" course. In it, I have a whole bunch of Moodle Book resources. The title of each is based on which server with chapters named for what it contains, such as, OS, web server, cron, unoconv, Moodle, PHP, Ansible, etc. When I first started this, I tried using wiki's, but got tired of making all the links to go from one page to another, so switched to books.
I also tend to put links to "interesting" forum entries in chapter pages anytime they seem to apply. I have a number of good Linux notes from all the great examples Ken has posted over the years, similar to those in his post here.