Any random subdomain redirects to www

Wiki Sysadmins
1

Redirect Random Subdomains to www

  1. Obtain an Alibaba Cloud AccessKey (using Alibaba Cloud as an example; apply for your own key).
AccessKey ID: LTAI5tQCfDcVcghn5
AccessKey Secret: J8ZayXB44MIWa1Mfnj
  1. Install acme.sh
cd ~
curl https://get.acme.sh | sh
  1. Switch the default CA to Let’s Encrypt, then reissue the certificate:
# Switch default CA to Let's Encrypt
~/.acme.sh/acme.sh --set-default-ca --server letsencrypt
# Issue a wildcard certificate (replace discourse.cc with your domain)
~/.acme.sh/acme.sh --issue --dns dns_ali -d discourse.cc -d '*.discourse.cc'
  1. Install the certificate into Discourse’s SSL directory.
    Copy the certificate to Discourse’s SSL directory

Execute as root (replace discourse.cc with your domain):

cp /home/admin/.acme.sh/discourse.cc_ecc/discourse.cc.key /var/discourse/shared/standalone/ssl/discourse.cc.key
cp /home/admin/.acme.sh/discourse.cc_ecc/fullchain.cer /var/discourse/shared/standalone/ssl/discourse.cc.cer
chmod 644 /var/discourse/shared/standalone/ssl/discourse.cc.*

Verify that the files exist:

ls -l /var/discourse/shared/standalone/ssl/

You should see discourse.cc.cer and discourse.cc.key.

  1. Modify the Discourse configuration and rebuild.
DISCOURSE_HOSTNAME: 'www.discourse.cc'
DISCOURSE_HOSTNAME_ALIASES: 'discourse.cc'
DISCOURSE_DISABLE_LETSENCRYPT: 'true'
  1. Configure Nginx redirect rules (if not already configured).
server {
    listen 80;
    server_name ~^(?!www\.)(.+)\.discourse\.cc$;
    return 301 https://www.discourse.cc$request_uri;
}
server {
    listen 443 ssl;
    server_name ~^(?!www\.)(.+)\.discourse\.cc$;
    ssl_certificate ...;
    ssl_certificate_key ...;
    return 301 https://www.discourse.cc$request_uri;
}
  1. Rebuild the container.
cd /var/discourse
sudo ./launcher rebuild app