System properties management

Question

Is there any "adequate" way to change system properties in Jenkins? What is the easiest/fastest way change them? For instance, I need to turn off the useless (in my case) pinging thread.

andrew lorien · Accepted Answer · 2018-02-19T01:37:52.550

38

If you really want a quick and simple way to change a system property, you can use the script console

System.setProperty("hudson.remoting.Launcher.pingIntervalSec", 0)

But that won't survive a restart. To make it permanent, add the setting to the java args. For me (CentOS, Jenkins 2.7.1) that's a line about halfway down /etc/sysconfig/jenkins (for other distributions I believe it's /etc/default/jenkins) where you should add your option to the existing list like this:

JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true -Dhudson.remoting.Launcher.pingIntervalSec=0"

You'll have to restart Jenkins after you make that change (thanks Mark Tickner)

edited Feb 19 '18 at 01:37

answered Aug 25 '16 at 04:40

andrew lorien

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2

Updating the JENKINS_JAVA_OPTIONS worked for me, but I had to reboot the server before it took effect – Mark Tickner Aug 30 '16 at 12:35
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Using System.setProperty doesn't seem to work, at least not for hudson.slaves.WorkspaceList. I set it to "+" and System.getProperty verifies this but it still uses the default value "@". – Marcus Ahlberg Jan 10 '17 at 16:12
Ubuntu 16.04 doesn't have sysconfig folder under /etc, how to fix it ? – vikramvi Feb 13 '18 at 16:54
@vikramvi I believe it's /etc/default for non-RedHat distributions. Answer updated. – andrew lorien Feb 19 '18 at 01:38
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On Debian / Ubuntu based Linux distributions you should use `JAVA_ARGS`. – Roberto Leinardi Jun 26 '19 at 08:41
On Debian, see also /etc/systemd/system/jenkins.service (shown in output from /usr/sbin/service jenkins status) – Kim Taylor Mar 31 '20 at 15:48
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Since 2.332.1, Jenkins on Linux uses systemd to manage services. As a consequence, system properties should no longer be managed via /etc/default/jenkins or /etc/sysconfig/jenkins but via systemd unit files. See the official documentation for more details on this: https://www.jenkins.io/doc/book/system-administration/systemd-services/ – Attila Csipak Jul 08 '22 at 10:09
Where can i find "/etc/default/jenkins"? – Chanikya Sep 05 '22 at 06:32

score 14 · Answer 2 · edited Mar 15 '18 at 11:13

If you run Jenkins on windows as a service without tomcat, you can edit jenkins.xml. Add the property in <service><arguments> before the -jar. Than restart the service.

<service>
    <!-- ... -->
    <arguments>-Xrs -Xmx256m  -Dhudson.lifecycle=hudson.lifecycle.WindowsServiceLifecycle  -Dhudson.tasks.MailSender.SEND_TO_UNKNOWN_USERS=true  -Dhudson.tasks.MailSender.SEND_TO_USERS_WITHOUT_READ=true  -jar "%BASE%\jenkins.war" --httpPort=8080 --webroot="%BASE%\war"</arguments>

score 5 · Answer 3 · answered Apr 09 '15 at 13:45

The system properties available and how to set them are listed on the wiki:
https://wiki.jenkins-ci.org/display/JENKINS/Features+controlled+by+system+properties

To disable slave pinging, you can set hudson.remoting.Launcher.pingIntervalSec to 0.

System properties can be set in the same way as with any other Java program, e.g.:
java -Dhudson.remoting.Launcher.pingIntervalSec=0 -jar jenkins.war

score 3 · Answer 4 · answered Feb 12 '16 at 09:01

3

If you use Tomcat on Windows you can edit the File C:\apache-tomcat-7.0.67\conf\catalina.properties and simply add the Line

hudson.DNSMultiCast.disabled=true

at the End of the File. Then safe the File and restart Tomcat.

answered Feb 12 '16 at 09:01

Dirk Schiller

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score 1 · Answer 5 · answered Jul 28 '15 at 20:20

I have the similar problem: I need to disable DNSMultiCast (set hudson.DNSMultiCast.disabled = false) and I can't understand how to do it

for example, https://wiki.jenkins-ci.org/display/JENKINS/Features+controlled+by+system+properties - there is such advice "...pass all of these arguments before the -jar argument..." but I run jenkins under tomcat so I am not sure I can change startup parameters.

I tried to change /etc/tomcat6/Catalina/localhost/jenkins.xml to

<?xml version="1.0" encoding="UTF-8"?>
<Context >
 <Environment name="JENKINS_HOME" value="/var/jenkins"
         type="java.lang.String" override="false"/>
 <Environment name="hudson.DNSMultiCast.disabled" value="true"
         type="java.lang.Boolean" override="false"/>
</Context>

but I didn't help. Can someone explain how to change jenkins system properties when tomcat is used.

http://stackoverflow.com/questions/31719756/how-to-stop-jenkins-log-from-becoming-huge take a look at this. You may also ask the author how and where did he put this java setting and compare to your Jenkins. — Zloj, Jul 30 '15 at 13:35

score 1 · Answer 6 · answered Jan 29 '18 at 13:38

1

Maybe it's a bad hack but I set it in the pipeline job that needs the setting.
Like this:

System.setProperty("hudson.model.DirectoryBrowserSupport.CSP", "")  // allow formatted HTML pages to be published

It seems to work - as far as I can tell...

answered Jan 29 '18 at 13:38

Roman

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score 1 · Answer 7 · answered May 30 '19 at 12:37

I followed each steps mentioned above but it fails.

So I did change the system time zone using timedatectl set-timezone Europe/London command and then I have restarted jenkins service service jenkins restart it worked.

I was using Rehdat 7.5
Jenkins version 2.168.
Jenkins Installed via yum install jenkins

I hope this will help some one.

System properties management

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