Using UFW (Uncomplicated Firewall)
# Install
sudo apt-get install ufw
# Enable / Disable UFW
sudo ufw enable
sudo ufw disable
# Check Status and Rules
ufw status verbose
# Show UFW Status
ufw status numbered
ufw allow ssh
ufw allow http
ufw allow
# Allow 3306 for MySQL on Eth1
ufw allow in on eth1 to any port 3306