Publishing multisite

installation
1

discourse/INSTALL-cloud.md at master · discourse/discourse · GitHub I read the post on the link and set up 1 site.

git clone https://github.com/discourse/discourse_docker.git /var/discourse2

If I install it to the discourse2 folder and run the command ./discourse-setup, will the site be installed?
Do I have to do anything with the nginx port?

2 
Port 80 appears to already be in use.

This will show you what command is using port 80
COMMAND    PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
docker-pr 1241 root    4u  IPv4  26166      0t0  TCP *:http (LISTEN)
docker-pr 1247 root    4u  IPv6  26172      0t0  TCP *:http (LISTEN)

If you are trying to run Discourse simultaneously with another web
server like Apache or nginx, you will need to bind to a different port

See https://meta.discourse.org/t/17247

If you are reconfiguring an already-configured Discourse, use 

./launcher stop app

to stop Discourse before you reconfigure it and try again.
3

No.

See Multisite configuration with Docker and Multisite Configuration with Let’s Encrypt and no reverse proxy.

You can also run multiple containers (copy app.yml, not all of Discourse) with a reverse proxy in front.

You can’t use discourse-setup. It’s just for very simple installations.

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