Extracting stuffs from my Jenkins container docker installation and passing to a new container

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Suppose that I have a container working!!

Here my Dockerfile...

FROM jenkinsci/blueocean
USER root
RUN apk update && apk add wget
RUN wget --no-verbose -O /tmp/apache-maven-3.6.3-bin.tar.gz https://downloads.apache.org/maven/maven-3/3.6.3/binaries/apache-maven-3.6.3-bin.tar.gz
RUN tar xzf /tmp/apache-maven-3.6.3-bin.tar.gz -C /opt/ 
RUN ln -s /opt/apache-maven-3.6.3 /opt/maven 
RUN ln -s /opt/maven/bin/mvn /usr/local/bin 
RUN rm /tmp/apache-maven-3.6.3-bin.tar.gz 
RUN chown jenkins:jenkins /opt/maven;

ENV MAVEN_HOME=/opt/mvn

Now I created the Image...

docker build -t jenkins/blueocean_ci --no-cache .

Now I run my container...

docker run -p 8080:8080 -p 50000:50000 --name jenkinsblue jenkins/blueocean_ci

I made a lot of changes ... plugins installations and pipelines...

ohhh I forget something (whatever to do)

Then I extracted the jenkins directory to d:\Documents\JenkinsBCK\...

docker cp jenkinsblue:/var/jenkins_home d:\Documents\JenkinsBCK\

I would like to persist my changes to previous specific folder location on Windows d:\Documents\JenkinsBCK\, and I will reuse it.

Now, I created another Container using reference to that directory like a Volume, changing ports...

docker run -v d:\Documents\JenkinsBCK:/var/jenkins_home -p 8081:8080 -p 50001:50000 --name jenkins_cnt jenkins/blueocean_ci

Now, I was trying to test my new container with my old stuffs...

http://localhost:8081/

Are you asking for the password again Located in /var/jenkins_home/secrets/initialAdminPassword? hhmmm OK no problem...

docker exec jenkins_cnt bash -c "cat /var/jenkins_home/secrets/initialAdminPassword"

Where are my old configured plugins and pipelines?

What's wrong?

How to do it?

docker-container windows-10 docker jenkins
1 Answers

Check value of $JENKINS_HOME Variable

docker exec JENKINS_CNT_SOURCE env
PATH=/opt/java/openjdk/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=b1f58b975483
LANG=en_US.UTF-8
LANGUAGE=en_US:en
LC_ALL=en_US.UTF-8
JAVA_VERSION=jdk8u292-b10
JAVA_HOME=/opt/java/openjdk
JENKINS_HOME=/var/jenkins_home
JENKINS_SLAVE_AGENT_PORT=50000
REF=/usr/share/jenkins/ref
JENKINS_VERSION=2.277.4
JENKINS_UC=https://updates.jenkins.io
JENKINS_UC_EXPERIMENTAL=https://updates.jenkins.io/experimental
JENKINS_INCREMENTALS_REPO_MIRROR=https://repo.jenkins-ci.org/incrementals
COPY_REFERENCE_FILE_LOG=/var/jenkins_home/copy_reference_file.log
MAVEN_HOME=/opt/mvn
HOME=/var/jenkins_home

Check the xml files

docker exec JENKINS_CNT_SOURCE bash -c "ls -al /var/jenkins_home/*.xml"
-rw-r--r-- 1 jenkins jenkins 1600 May  5 00:09 /var/jenkins_home/config.xml
-rw-r--r-- 1 jenkins jenkins  156 May  5 00:09 /var/jenkins_home/hudson.model.UpdateCenter.xml
-rw-r--r-- 1 jenkins jenkins  370 May  4 21:07 /var/jenkins_home/hudson.plugins.git.GitTool.xml
-rw-r--r-- 1 jenkins jenkins  179 May  4 21:18 /var/jenkins_home/jenkins.model.JenkinsLocationConfiguration.xml
-rw-r--r-- 1 jenkins jenkins  171 May  4 21:07 /var/jenkins_home/jenkins.telemetry.Correlator.xml
-rw-r--r-- 1 jenkins jenkins  907 May  5 00:09 /var/jenkins_home/nodeMonitors.xml

Extract files from the Source Container

docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/config.xml C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/hudson.model.UpdateCenter.xml C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/hudson.plugins.git.GitTool.xml C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/jenkins.model.JenkinsLocationConfiguration.xml C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/jenkins.telemetry.Correlator.xml C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/nodeMonitors.xml C:\BCKJenkins\

docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/jobs C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/nodes C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/plugins C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/secrets C:\BCKJenkins\
docker cp JENKINS_CNT_SOURCE:/var/jenkins_home/users C:\BCKJenkins\

Change port if is needed (8081)

Edit your file C:\BCKJenkins\jenkins.model.JenkinsLocationConfiguration.xml

<?xml version='1.1' encoding='UTF-8'?>
<jenkins.model.JenkinsLocationConfiguration>
  <adminAddress>address not configured yet &lt;nobody@nowhere&gt;</adminAddress>
  <jenkinsUrl>http://localhost:8080/</jenkinsUrl>
</jenkins.model.JenkinsLocationConfiguration>

Insert files to Target Container

docker cp C:\BCKJenkins\config.xml JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\hudson.model.UpdateCenter.xml JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\hudson.plugins.git.GitTool.xml JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\jenkins.model.JenkinsLocationConfiguration.xml JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\jenkins.telemetry.Correlator.xml JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\nodeMonitors.xml JENKINS_CNT_TARGET:/var/jenkins_home/

docker cp C:\BCKJenkins\jobs JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\nodes JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\plugins JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\secrets JENKINS_CNT_TARGET:/var/jenkins_home/
docker cp C:\BCKJenkins\users JENKINS_CNT_TARGET:/var/jenkins_home/

Change Ownership recursively

docker exec --user=root JENKINS_CNT_TARGET bash -c "chown -R jenkins:jenkins $JENKINS_HOME"

OR

docker exec -it --user=root JENKINS_CNT_TARGET bash
bash-5.0# chown -R jenkins:jenkins $JENKINS_HOME

Restart the target container

docker restart JENKINS_CNT_TARGET

Check Port Conflict

In order to avoid port conflict with old container get access to the Jenkins

Dashboard -> Manage Jenkins -> Configure System => Jenkins URL (update to new port).
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