Firewall Rules (UFW)

ServOS uses UFW (Uncomplicated Firewall) to secure your servers. During the commissioning process, ServOS takes over firewall management to ensure a secure baseline.

Enforced Rules

To maintain security and functionality, ServOS enforces the following rules:

Default Policy

• Incoming: DENY (Block all unsolicited traffic)
• Outgoing: ALLOW (Allow server to reach the internet)

Allow List

WireGuard Port: The default configuration setup by ServOS should allow port 51820/udp. If you find connectivity issues between servers, verify that this port is open in both UFW (sudo ufw status) and your cloud provider’s firewall.

Docker Security Fix (ufw-docker)

By default, Docker manipulates iptables directly, which can inadvertently bypass UFW rules. This means a container exposing a port (e.g., -p 8080:8080) might be accessible from the internet even if UFW says “Deny”.

ServOS solves this by automatically applying the ufw-docker patch during commissioning. This ensures that:

• Docker traffic is routed through UFW chains.
• Only ports explicitly allowed in UFW are accessible.
• Internal network isolation is respected.

Customizing Rules

You can add custom rules (e.g., allowing specific IPs) using standard UFW commands on the server:

# Example: Allow MySQL only from a specific IP
sudo ufw allow from 1.2.3.4 to any port 3306 proto tcp

ServOS will not overwrite your custom rules during re-commissioning, as long as the base requirements are met.