Redirect single/multiple domain(s) to your Discourse instance

So you want to redirect domain(s) to your Discourse instance? Great, let’s get started!

In this tutorial we’ll show how to redirect www.example.com and example.com to talk.example.com.

Update DNS Record

Update the A record for the domain(s) you want to redirect to original domain.

Edit Configuration FIle

Open configuration file app.yml. From console, run these commands:

cd /var/discourse
git pull
nano containers/app.yml

Configuration file will open in nano editor. Search for hooks (with Ctrl+W) in the file:

hooks:
  after_code:
    - exec:
        cd: $home/plugins
        cmd:
          - mkdir -p plugins
          - git clone https://github.com/discourse/docker_manager.git

Add after_web_config block to the hooks (proper indentation is important):

hooks:
  after_code:
    - exec:
        cd: $home/plugins
        cmd:
          - mkdir -p plugins
          - git clone https://github.com/discourse/docker_manager.git
  after_web_config:
    - replace:
        filename: /etc/nginx/nginx.conf
        from: /sendfile.+on;/
        to: |
          server_names_hash_bucket_size 64;
          sendfile on;
    - file:
        path: /etc/nginx/conf.d/discourse_redirect_1.conf
        contents: |
          server {
            listen 80;
            server_name example.com;
            return 301 $scheme://talk.example.com$request_uri;
          }
    - file:
        path: /etc/nginx/conf.d/discourse_redirect_2.conf
        contents: |
          server {
            listen 80;
            server_name www.example.com;
            return 301 $scheme://talk.example.com$request_uri;
          }

You can add as many file blocks as you want, depending on number of domain(s) you want to redirect:

    - file:
        path: /etc/nginx/conf.d/discourse_redirect_3.conf
        contents: |
          server {
            listen 80;
            server_name discourse.example.com;
            return 301 $scheme://talk.example.com$request_uri;
          }

Modify the file name discourse_redirect_3 and domain name to which you want to redirect discourse.example.com as per your need.

Note that original domain name talk.example.com will remain same in all file blocks.

After completing your edits, press Ctrl+O then Enter to save and Ctrl+X to exit.

Rebuild Container

Run this command:

./launcher rebuild app

Congratulations, that’s it! Try visiting example.com and www.example.com, they both will redirect to talk.example.com!

Source: https://meta.discourse.org/t/redirect-single-multiple-domain-s-to-your-discourse-instance/18492