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Jenkins (II): Configure Jenkins To Run On Port 80

Jenkins is running on port 8080 by default, thus user need to manually add :8080 when access Jenkins. If we make it running on port 80(default http port), user will no longer need to type port number manually.

Open ports and forwarding

First of all we need to make sure that ports 8080/80 and 8443/433 have been opened. To check, use sudo iptalbes -L -n. If those ports are not opened to tcp, use following commands to add rules:

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sudo iptables -I INPUT 1 -p tcp --dport 8443 -j ACCEPT
sudo iptables -I INPUT 1 -p tcp --dport 8080 -j ACCEPT
sudo iptables -I INPUT 1 -p tcp --dport 443 -j ACCEPT
sudo iptables -I INPUT 1 -p tcp --dport 80 -j ACCEPT

Then forward 8080 to 80 and 8443 to 443:

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sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8443

You need to save the configuration:

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

Use iptables-persistent to config rules on boot

Rules we configured in iptables will not automatically applied again when reboot. To configure to automatically run it on boot, install iptables-persistent:

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sudo apt-get install iptables-persistent