The following instructions install Epicyon to the /opt directory. It's not essential that it be installed there, and it could be in any other preferred directory.

Clone the repo, or if you downloaded the tarball then extract it into the /opt directory.

cd /opt

git clone https://gitlab.com/bashrc2/epicyon

sudo su

adduser --system --home=/opt/epicyon --group epicyon

chown -R epicyon:epicyon /opt/epicyon

nano /etc/systemd/system/epicyon.service

[Unit]
Description=epicyon
After=syslog.target
After=network.target

[Service]
Type=simple
User=epicyon
Group=epicyon
WorkingDirectory=/opt/epicyon
ExecStart=/usr/bin/python3 /opt/epicyon/epicyon.py --port 443 --proxy 7156 --domain YOUR_DOMAIN --registration open --debug
Environment=USER=epicyon
Environment=PYTHONUNBUFFERED=true
Restart=always
StandardError=syslog
CPUQuota=80%

[Install]
WantedBy=multi-user.target

systemctl enable epicyon
systemctl start epicyon

nano /etc/nginx/sites-available/YOUR_DOMAIN

server {
listen 80;
listen [::]:80;
server_name YOUR_DOMAIN;
access_log /dev/null;
error_log /dev/null;
client_max_body_size 31m;
client_body_buffer_size 128k;

limit_conn conn_limit_per_ip 10;
limit_req zone=req_limit_per_ip burst=10 nodelay;

index index.html;
rewrite ^ https://$server_name$request_uri? permanent;
}

server {
listen 443 ssl;
server_name YOUR_DOMAIN;

ssl_stapling off;
ssl_stapling_verify off;
ssl on;
ssl_certificate /etc/letsencrypt/live/YOUR_DOMAIN/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/YOUR_DOMAIN/privkey.pem;
#ssl_dhparam /etc/ssl/certs/YOUR_DOMAIN.dhparam;

ssl_session_cache builtin:1000 shared:SSL:10m;
ssl_session_timeout 60m;
ssl_prefer_server_ciphers on;
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection "1; mode=block";
add_header X-Download-Options noopen;
add_header X-Permitted-Cross-Domain-Policies none;

add_header X-Robots-Tag "noindex, nofollow, nosnippet, noarchive";
add_header Strict-Transport-Security max-age=15768000;

access_log /dev/null;
error_log /dev/null;

index index.html;

location / {
proxy_http_version 1.1;
client_max_body_size 31M;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forward-Proto http;
proxy_set_header X-Nginx-Proxy true;
proxy_temp_file_write_size 64k;
proxy_connect_timeout 10080s;
proxy_send_timeout 10080;
proxy_read_timeout 10080;
proxy_buffer_size 64k;
proxy_buffers 16 32k;
proxy_busy_buffers_size 64k;
proxy_redirect off;
proxy_request_buffering on;
proxy_buffering on;
proxy_pass http://localhost:7156;
}
}

ln -s /etc/nginx/sites-available/YOUR_DOMAIN /etc/nginx/sites-enabled/

Forward port 443 from your internet router to your server. If you have dynamic DNS make sure its configured. Add a TLS certificate:

certbot certonly -n --server https://acme-v01.api.letsencrypt.org/directory --standalone -d YOUR_DOMAIN --renew-by-default --agree-tos --email YOUR_EMAIL

systemctl restart nginx

Now you can navigate to your domain and register an account. The first account becomes the administrator.