Debian update overwrites environment settings

[Jochen Wiedmann]

Hi,

I am using the Jenkins Debian packages from

    https://pkg.origin.jenkins.io/debian/

to install, and update Jenkins. In general, I'm quite happy with that. There is one exception, though:

My setup requires changing of two environment variables, JENKINS_PORT, and JAVA_HOME. Right now, I have configured those by editing jenkins.service. In other words, I am advising systemd to set the proper values.

The problem with that: Any update of Jenkins (of which there are quite a few, thankfully) replaces the jenkins.service file, thus overwriting my changes. In other words: After each update, I need to reapply my changes to jenkins.service.

Is there any better location for those values, that survives updates?

Thanks,

Jochen

[Mark Waite]

There is a better location for those values and it will survive updates.  The "Managing systemd services" page describes the "systemctl edit jenkins" command that creates a local copy of the overrides file .  That copy is preserved across upgrades.

Mark Waite

 

[Dirk Heinrichs]

Am Dienstag, dem 02.01.2024 um 11:30 -0800 schrieb Mark Waite:

There is a better location for those values and it will survive updates.  The"Managing systemd services" page describes the "systemctl edit jenkins" command that creates a local copy of the overrides file .  That copy is preserved across upgrades.

Or, if you prefer the manual way or use a provisioning tool like Puppet or Salt, you can create a directory under "/etc/systemd/system/" with the same name as the service file and an appended ".d" and place any number of override files inside, with a ".conf" extension. Note that if you want to change one of the "Exec*" values, you need to empty it first, like

ExecStart=

ExecStart=/path/to/new/command options

See systemd.unit(5) and systemd.service(5) for the details.

HTH...

Dirk

-- 

Dirk Heinrichs

Senior Systems Engineer, Delivery Pipeline

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[Jochen Wiedmann]

Thanks, Mark,

your suggestion works perfectly. For the record, I now have a file /etc/systemd/system/jenkins.service.d/override.conf with the following content:

    [Service]
    Environment="JAVA_HOME=/usr/lib/jvm/temurin-17-jdk-amd64"
    Environment="JENKINS_PORT=8008"

This changes both the JVM, that is used to run Jenkins, and the port number.

Jochen