UFW Settings

UFW is a firewall configuration tool that is included with Ubuntu. We use it to limit the available ports on our node.

Verify UFW configuration

To verify that UFW is installed and configured, do the following:

1. First confirm that UFW is installed.

   ufw --version

   You should see something like this:

   ufw 0.36
   Copyright 2008-2015 Canonical Ltd.

2. Check that UFW is enabled.

   ufw status

   You should see something like this:

   Status: active
   
   To                         Action      From
   --                         ------      ----
   Nginx Full                 ALLOW       Anywhere                  
   8081                       ALLOW       Anywhere                  
   26656                      ALLOW       Anywhere                  
   22/tcp                     ALLOW       Anywhere                  
   Nginx Full (v6)            ALLOW       Anywhere (v6)             
   8081 (v6)                  ALLOW       Anywhere (v6)             
   26656 (v6)                 ALLOW       Anywhere (v6)             
   22/tcp (v6)                ALLOW       Anywhere (v6)  

Installing UFW

If UFW is not installed, you can install it with the following command:

sudo apt-get install ufw  

Next, run the following commands to configure and enable UFW:

sudo ufw default deny incoming  
sudo ufw default allow outgoing  
sudo ufw allow ssh   
sudo ufw allow 443
sudo ufw allow 80  
sudo ufw allow 8081
sudo ufw allow 26656    
sudo ufw enable  
sudo ufw status verbose