Dear fellows, I need your help.

I decided to install Nextcloud 11, had no problems at all, even authorization via AD worked properly. Then I tried to enclose Collabora online - and nothing came out. Docker starts properly, in the Nextcloud logs (apache2 / nginx) nothing found, as well as in Docker logs.

The system is Ubuntu 16.04.2, web server Apache2 (tried and nginx, also failed), hosted on gthost.com. I did everything according to instructions here. Self-signed certificates were made through openssl.

Which site name should I choose? What should be written down in Docker during start in the 'domain =' section, and how to choose name for the collabora site properly?

Hi Franky
Welcome to Linuxquestions.

First, Dude if you're on your honeymoon, you are doing it all wrong. Put down the laptop and go ask Mrs Franky what she feels like doing, you may become a Lawyer or MBA shortly thereafter because you don't have time for this computer foolishness anymore.

Secondly, assuming you haven't sprinted off to take my advice on point number one (which I'm really hoping you did...), did you check this log
And if you did, can you see your docker nodes logging into it as well as the Collabora server? If you have to turn your logging level up to do so, it would be valuable to verify it's working.