Run other websites on the same machine as Discourse

Documentation Self-Hosting
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PSA: If you want to allow uploads larger than 1MB to your site, you’ll also have to set client_max_body_size 100M in any nginx config that sits in front of your site.

For reference, here’s the full nginx config I use:

nginx config for other sites on same host 
server {
    if ($host = discourse.mysite.org) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = backupname.mysite.org) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80; listen [::]:80;
    server_name discourse.mysite.org;
    server_name backupname.mysite.org;

    location / {
        proxy_pass http://unix:/var/discourse/shared/mysite/nginx.http.sock:;
        proxy_set_header Host $http_host;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

# nginx 1.14.1 | intermediate profile | OpenSSL 1.1.0f | link

server {
    listen 443 ssl http2;  listen [::]:443 ssl http2;
    server_name discourse.mysite.org;
    server_name backupname.mysite.org;

    # from discourse examples
    http2_idle_timeout 5m; # up from 3m default
    client_max_body_size 50M; # allow 50M uploads

    location / {
        proxy_pass http://unix:/var/discourse/shared/mysite/nginx.http.sock:;
        proxy_set_header Host $http_host;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header X-Real-IP $remote_addr;
    }
    ssl_certificate /etc/letsencrypt/live/backupname.mysite.org/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/backupname.mysite.org/privkey.pem; # managed by Certbot

    ###### https://mozilla.github.io/server-side-tls/ssl-config-generator/ ####

    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;

    # modern configuration. tweak to your needs.
    ssl_protocols TLSv1.2;
    ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';
    ssl_prefer_server_ciphers on;

    # HSTS (ngx_http_headers_module is required) (15768000 seconds = 6 months)
    add_header Strict-Transport-Security max-age=15768000;

    # OCSP Stapling ---
    # fetch OCSP records from URL in ssl_certificate and cache them
    ssl_stapling on;
    ssl_stapling_verify on;

    ## verify chain of trust of OCSP response using Root CA and Intermediate certs
    ssl_trusted_certificate /etc/letsencrypt/live/backupname.mysite.org/chain.pem;

    resolver 1.1.1.1;

}
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