Update Jenkins Inside a Docker Container

README.md

First identify your image.

$ docker ps --format "{{.ID}}: {{.Image}} {{.Names}}"
3d2fb2ab2ca5: jenkins-docker jenkins-docker_1

Then login into the image as root.

$ docker container exec -u 0 -it jenkins-docker_1 /bin/bash

Now you are inside the container, download the jenkins.war file from the official site like.

# wget wget http://updates.jenkins-ci.org/download/war/2.176.1/jenkins.war

Replace the version with the one that fits to you.

The next step is to move that file and replace the oldest one.

# mv ./jenkins.war /usr/share/jenkins/

Then change permissions.

# chown jenkins:jenkins /usr/share/jenkins/jenkins.war

The last step is to logout from the container and restart it.

$ docker restart jenkins-docker_1

You can verify that update was successful by access to you Jenkins url.

@ashkanyo If for some reason you can't use wget inside the docker container, then you can download the file on the host and copy it to the container with this command:
docker cp jenkins.war jenkins-docker_1:/var/jenkins_home
and then enter the CLI of the container and replace the file
mv /var/jenkins_home/jenkins.war /usr/share/jenkins/

Hi I did it step by step but I get this error:

would you please help me ?

You should use wget only once in the terminal. As you have used it twice, wget is resolving wget instead of the link.

thank you!

@ashkanyo If you can't use wget inside the docker container just use curl
curl -o jenkins.war https://ftp.halifax.rwth-aachen.de/jenkins/war-stable/2.375.3/jenkins.war

I don’t know it’s showing me command not found
What can be the problem am not getting

@mehreenverma20 if you can't find the command in a docker container, don't worry, you can just install it via apt-get install wget .

thank you!

For everyone who has issues with WGET inside the docker container. Update and Upgrade the Container like a normal Linux OS. In this case use apt update && apt upgrade and then install with apt install wget. This should fix problem.

Thank you! Worked great!

thank you.

thanks

If you've used docker-compose to create your Jenkins container, you can also use the following commands to update the container:

docker-compose stop
docker-compose rm -f
docker-compose pull
docker-compose up -d

If you've used docker-compose to create your Jenkins container, you can also use the following commands to update the container:

docker-compose stop
docker-compose rm -f
docker-compose pull
docker-compose up -d

this helped me, thanks!

I am surprised by this. I thought modification inside a container were not persistent.
Am I missing something?