Upgrade the Jenkins running in a Docker container

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If you are using Docker for running Jenkins CI server chances are you will get messages such as a "New version of Jenkins is available for download"


Now if you want to upgrade your Jenkins server follow the steps below:

1. Login to your jenkins container
docker container exec -u 0 -it jenkins bash

2. Change the directory to jenkins folder
cd /usr/share/jenkins

3. Take a backup of your old jenkins.war file
mv jenkins.war jenkins.war_bak

4. Download the latest version of jenkins
wget http://updates.jenkins-ci.org/download/war/2.164.3/jenkins.war

5. Change permission of the file
chown jenkins:jenkins jenkins.war

6. Exit the container and restart it
exit
docker container restart jenkins

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