jenkins in docker - how to change timezone

Question

Question:

• How do I set the timezone in jenkins in a docker container so that when you reboot the server it retains the setting?

So i'm running RHEL 7 on AWS with docker and jenkins (https://hub.docker.com/r/jenkinsci/blueocean/).

This article talks about how to change the timezone https://wiki.jenkins.io/display/JENKINS/Change+time+zone

essentially two ways

1. run System.setProperty('org.apache.commons.jelly.tags.fmt.timeZone', 'America/New_York') in the script console which works but if you reboot the server or jenkins it reverts back
2. add it to /etc/sysconfig/jenkins, unfortunately that directory does not exist as it's running in a container

However i have created a volume for the settings folder this way

docker run -d -p 8080:8080 -v $PWD/jenkins:/var/jenkins_home:z -t jenkinsci/blueocean 

this makes the home directory "jenkins-blue"

the directory listing is

4 -rw-r--r--.   1 <omitted user>  1647 Feb 27 17:00 config.xml
4 -rw-r--r--.   1 <omitted user>  3982 Feb 27 16:57 copy_reference_file.log
4 -rw-r--r--.   1 <omitted user>   966 Feb 27 17:04 credentials.xml
0 drwxr-xr-x.   3 <omitted user>    16 Feb 27 17:06 fingerprints
4 -rw-r--r--.   1 <omitted user>   156 Feb 27 16:57 hudson.model.UpdateCenter.xml
4 -rw-r--r--.   1 <omitted user>  1230 Feb 27 17:07 hudson.plugins.emailext.ExtendedEmailPublisher.xml
4 -rw-r--r--.   1 <omitted user>   370 Feb 27 16:58 hudson.plugins.git.GitTool.xml
4 -rw-------.   1 <omitted user>  1712 Feb 27 16:57 identity.key.enc
0 drwxr-xr-x.   2 <omitted user>    41 Feb 27 16:57 init.groovy.d
4 -rw-r--r--.   1 <omitted user>    94 Feb 27 16:58 jenkins.CLI.xml
4 -rw-r--r--.   1 <omitted user>     7 Feb 27 17:00 jenkins.install.InstallUtil.lastExecVersion
4 -rw-r--r--.   1 <omitted user>     7 Feb 27 17:00 jenkins.install.UpgradeWizard.state
4 -rw-r--r--.   1 <omitted user>   183 Feb 27 17:00 jenkins.model.JenkinsLocationConfiguration.xml
4 -rw-r--r--.   1 <omitted user>   171 Feb 27 16:57 jenkins.telemetry.Correlator.xml
0 drwxr-xr-x.   3 <omitted user>    18 Feb 27 17:00 jobs
0 drwxr-xr-x.   4 <omitted user>    37 Feb 27 16:58 logs
4 -rw-r--r--.   1 <omitted user>   907 Feb 27 16:58 nodeMonitors.xml
0 drwxr-xr-x.   2 <omitted user>     6 Feb 27 16:58 nodes
20 drwxr-xr-x. 106 <omitted user> 16384 Feb 27 16:59 plugins
4 -rw-r--r--.   1 <omitted user>   129 Feb 28 17:35 queue.xml
4 -rw-r--r--.   1 <omitted user>    64 Feb 27 16:57 secret.key
0 -rw-r--r--.   1 <omitted user>     0 Feb 27 16:57 secret.key.not-so-secret
4 drwx------.   4 <omitted user>  4096 Feb 27 17:14 secrets
0 drwxr-xr-x.   2 <omitted user>   182 Feb 27 16:59 updates
0 drwxr-xr-x.   2 <omitted user>    24 Feb 27 16:58 userContent
0 drwxr-xr-x.   3 <omitted user>    57 Feb 27 17:00 users
4 drwxr-xr-x.  11 <omitted user>  4096 Feb 27 16:57 war
0 drwxr-xr-x.   2 <omitted user>     6 Feb 27 16:58 workflow-libs
0 drwxr-xr-x.   4 <omitted user>    34 Feb 27 17:06 workspace

Answer 1

You may apply a TZ environment into your docker-compose like this:

image: jenkins/jenkins:alpine
container_name: jenkins
hostname: jenkins
restart: always
environment:
  - TZ=Asia/Shanghai
volumes:
  - ./jenkins/data:/var/jenkins_home
  - ./jenkins/bin/jenkins.war:/usr/share/jenkins/jenkins.war

Answer 2

Run it in System Management -> Script command line：

System.setProperty('org.apache.commons.jelly.tags.fmt.timeZone', 
'Asia/Shanghai')

https://wiki.jenkins.io/display/JENKINS/Change+time+zone

BTW, I add this in my Timed tasks:

TZ=Asia/Shanghai
40 15 * * 1-5

OR

docker run ... -e JAVA_OPTS=-Duser.timezone=Asia/Shanghai

https://github.com/jenkinsci/docker/issues/45