How to start node.js on port 80 on a linux server?

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8000

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3000

sudo sh -c "iptables-save > /etc/iptables.rules"

pre-up iptables-restore < /etc/iptables.rules

1. sudo su
 2. iptables-save > /etc/iptables.rules
 3. In /etc/network/if-pre-up.d/iptables,put:

 #!/bin/sh
 iptables-restore < /etc/iptables.rules
 exit 0

 4. After, in /etc/network/if-post-down.d/iptables,put:
 #!/bin/sh
 iptables-save -c > /etc/iptables.rules
 if [ -f /etc/iptables.rules ]; then
 iptables-restore < /etc/iptables.rules
 fi
 exit 0
 5. After, give permission to the scripts:
 sudo chmod +x /etc/network/if-post-down.d/iptables
 sudo chmod +x /etc/network/if-pre-up.d/iptables

Posted in: NodeJS, Ubuntu