Install NextCloud Hub and OnlyOffice on Ubuntu 22.04 with Docker Compose

This is another update of my previous posts (installing NextCloud with Collabora Office Online on Ubuntu 16.04 and then NextCloud with OnlyOffice on Ubuntu 18.04). I'm updating it thanks to my colleague in edtech, Stephen Downes' heroic videos showing how he went through this process using my 18.04 instructions on 22.04, running into a few minor issues... this update seeks to remedy the problems he encountered with the older tutorial.

Creating strong random passwords

Throughout our Free and Open Source Software tutorials, we need to specify passwords for things. Creating random passwords is surprisingly hard, but we've found a method that's very serviceable and makes it easy to do as we all should: ensure every separate identity or service has a strong password that is unique to that identity and application (i.e. never use the same password in more than one place). We also strongly encourage you all to track your passwords using a password manager!

Configuring a Linux server to send email via the Postfix SMTP server using an external authenticating SMTP host

Just about any and every server needs to be able to send email - whether it's end-user-email, like password recovery services for a website to emails to system administrators reporting on the status of system backups and errors. The problem is that it's non trivial (understatement) to set up a mail server properly.