How to configure Jenkins to run on port 80 on Centos 7


How to configure Jenkins to run on port 80 on Centos 7



I've installed Jenkins, based on Jetty server on Centos 7.
In the configuration file : /etc/sysconfig/jenkins default port is 8080, and everything works perfectly, but I need to move jenkins on 80 port.



When I change JENKINS_PORT="8080" to JENKINS_PORT="80" - jenkins no longer available. Firewall I turned off.



in log messages: /var/log/jenkins/jenkins.log


Aug 17, 2017 12:07:45 PM org.eclipse.jetty.util.log.JavaUtilLog warn
WARNING: FAILED ServerConnector@4082ba93{HTTP/1.1}{0.0.0.0:80}: java.net.SocketException: Permission denied
java.net.SocketException: Permission denied
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:433)
at sun.nio.ch.Net.bind(Net.java:425)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:321)
at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:236)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.server.Server.doStart(Server.java:366)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at winstone.Launcher.<init>(Launcher.java:152)
at winstone.Launcher.main(Launcher.java:352)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at Main._main(Main.java:293)
at Main.main(Main.java:132)



Can anyone help me with that problem?




3 Answers
3



Google led me to https://confluence.atlassian.com/confkb/permission-denied-error-when-binding-a-port-290750651.html



Ports below 1024 are called Privileged Ports and in Linux (and most UNIX flavors and UNIX-like systems), they are not allowed to be opened by any non-root user.



So as I run startup script as JENKINS_USER="jenkins" the Permission denied error has appeared.





this answer isn't complete. While you identify the problem, you've not mentioned a solution. What i did was install a httpd on port 80 and use it to proxy the tomcat
– Monish Sen
Dec 22 '17 at 10:16



Could you try this Centos7 firewall setting?



Don't need to turn off firewall.


firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --zone=public --add-service=http --permanent
firewall-cmd --reload
firewall-cmd --list-all



Then starting Jenkins.





I tried that too, doesn't help.
– nimda
Aug 18 '17 at 7:23





Adding firewall entry doesn't elevate permission
– Monish Sen
Dec 22 '17 at 10:13



I struggled for hours with this problem. What i did to solve it eventually was, on Ubuntu, I changed the JENKINS_USER variable value from $NAME to root in /etc/default/jenkins. Then, I did a daemon reload by running the command below.


JENKINS_USER


/etc/default/jenkins


$ systemctl daemon-reload



Finally, I restarted jenkins as root.


$ service jenkins restart






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