Most Probably if You’re using the Ubuntu 16.04 or Higher, Your system can automagically update docker when an update is available if You choose to automate all updates (not just security) or else choose to do
Sudo apt update sudo apt upgrade
every once in a while. That should suffice the needs for all Your sysadmin duties if You’re only running the forum and The internet Gods are gracious enough not to DDoS Your server.
Use Good security practices for ubuntu, Don’t ask me how, You need to figure out what suits Your system the best. There are thousands of such tutorials online so use Google and a bit of Your own skills.
There are a lot of troubles possible but what are you there for if You can’t troubleshoot them. Nevermind, You can post here if there is something wrong with discourse or else Google a bit for possible solutions to Your problem. In all the cases, I’d suggest You schedule daily backups and upload them to 3rd party like AWS S3 to save Your day in case something Goes bad.
Wrong!
You have to Go to /admin/upgrade and perform update to
a. All the Plugins that require Update
b. Discourse Core
You can choose to spare a sunday every 2 weeks to do all the update and housekeeping things and You’d be good to go unless something decides to break terribly … in which case, Have a Good time fixing it.
Ps: Backups are Important. DO BACKUP YOUR DATA!!!