coder.conf

server {
    listen       80;
    listen       [::]:80;
    server_name  *.coder.mydomain.com;
    return	 301 https://$host$request_uri;
}

server {
   listen       443 ssl;
   server_name  *.coder.mydomain.com;

   ssl_protocols TLSv1.2 TLSv1.3;
   ssl_certificate /ssl/fullchain.pem;
   ssl_certificate_key /ssl/privkey.pem;
   ssl_dhparam /ssl/dhparam.pem;
   ssl_ecdh_curve secp384r1;
   ssl_prefer_server_ciphers on;
   ssl_ciphers EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH;

   access_log /var/log/nginx/coder/access.log;
   error_log /var/log/nginx/coder/error.log;

   location / {
       proxy_pass http://k3sserver:8080/;
       proxy_http_version 1.1;
       proxy_set_header Upgrade $http_upgrade;
       proxy_set_header Connection "Upgrade";
       proxy_set_header Host $host;
   }
}