How to configure Jenkins to run on port 80

Question

I'm running Ubuntu 11.10 and have run sudo apt-get install jenkins to install Jenkins on this system.

I've seen some tutorials on how to setup a reverse proxy (Apache, Nginx, etc), however this is a VM dedicated for just jenkins and I'd like keep it as lean as possible while having jenkins running on port 80.

I've found the upstart config in /etc/init/jenkins.conf and modified the port to 80 env HTTP_PORT=80

When I start jenkins via service jenkins start, ps reveals that it runs for a few seconds then terminates.

Is this because jenkins is running as the jenkins user on a privileged port? If so, how do I fix this? Any other ideas a welcome.

Here is the upstart config:

description "jenkins: Jenkins Continuous Integration Server" author "James Page <[email protected]>"  start on (local-filesystems and net-device-up IFACE!=lo) stop on runlevel [!2345]  env USER="jenkins" env GROUP="jenkins" env JENKINS_LOG="/var/log/jenkins" env JENKINS_ROOT="/usr/share/jenkins" env JENKINS_HOME="/var/lib/jenkins" env JENKINS_RUN="/var/run/jenkins" env HTTP_PORT=80 env AJP_PORT=-1 env JAVA_OPTS="" env JAVA_HOME="/usr/lib/jvm/default-java"  limit nofile 8192 8192  pre-start script     test -f $JENKINS_ROOT/jenkins.war || { stop ; exit 0; }     $JENKINS_ROOT/bin/maintain-plugins.sh        mkdir $JENKINS_RUN > /dev/null 2>&1  || true     chown -R $USER:$GROUP $JENKINS_RUN || true end script  script     JENKINS_ARGS="--webroot=$JENKINS_RUN/war --httpPort=$HTTP_PORT --ajp13Port=$AJP_PORT"     exec daemon --name=jenkins --inherit --output=$JENKINS_LOG/jenkins.log --user=$USER \         -- $JAVA_HOME/bin/java $JAVA_OPTS -jar $JENKINS_ROOT/jenkins.war $JENKINS_ARGS \         --preferredClassLoader=java.net.URLClassLoader end script 

Answer 1

Another solution is to simply use iptables to reroute incoming traffic from 80 to 8080. The rules would look like:

-A INPUT -i eth0 -p tcp --dport 80 -j ACCEPT -A INPUT -i eth0 -p tcp --dport 8080 -j ACCEPT -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080 

Reformatted as an iptables.rules file:

*filter :INPUT ACCEPT [100:100000] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [95:9000] -A INPUT -i eth0 -p tcp --dport 80 -j ACCEPT -A INPUT -i eth0 -p tcp --dport 8080 -j ACCEPT COMMIT  *nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080 COMMIT 

The advantage of a iptable.rules file is the rules can persist after reboots. Just make sure to integrate any other current iptable rules into the same file!

On Redhat/CentOS this file can go in /etc/sysconfig/iptables.

On Debian/Ubuntu systems they can be saved in /etc/iptables/rules.v4 by using the iptables-persistent package. Or the iptable.rules can be called by modifying /etc/network/interfaces or hooking into if-up/if-down scripts. The Ubuntu Community wiki has a great page explaining these methods.

As is usually the case with networking, there's a lot of different ways to accomplish the same result. Use what works best for you!

Answer 2

1. Go to /etc/default folder --> Open the file "jenkins"
2. Modify the line HTTP_PORT=8080 as HTTP_PORT=80
3. Start jenkins as root by using the command: sudo /etc/init.d/jenkins start
4. Open a browser and browse as localhost:80

that's it