Jenkins version upgrade

1. The jenkins version is too low, and some plug-ins cannot be upgraded. At this time, we need to upgrade the jenkins version

2. The first method - pull down will let us download the new version on the jenkins page

3. The second method is to download the war package from the official website

https://www.jenkins.io/

4. Enter the jenkins login machine and find jenkins.war

5. Copy a copy of jenkins.war as a backup

6. Close the jenkins service and check the jenkins status

systemctl stop jenkins

systemctl status jenkins 

7. Move the latest jenkins.war to the current directory

[root@mylinux1 ~]# find / -name jenkins.war
/var/lib/docker/overlay2/9faa04c279a7a03a33a9714036e8132f4812b3e62a4a39e691a3918c082bffc6/diff/usr/share/jenkins/jenkins.war
/var/lib/docker/overlay2/24318a7e61e01f7564924bddd0e90ecb25a75a33b82cc0b81b9d14949ccb9533/merged/usr/share/jenkins/jenkins.war
[root@mylinux1 ~]# cd /var/lib/docker/overlay2/9faa04c279a7a03a33a9714036e8132f4812b3e62a4a39e691a3918c082bffc6/diff/usr/share/jenkins/
[root@mylinux1 jenkins]# ls
jenkins_cp.war  jenkins.war
[root@mylinux1 jenkins]# cd /var/lib/docker/overlay2/24318a7e61e01f7564924bddd0e90ecb25a75a33b82cc0b81b9d14949ccb9533/merged/usr/share/jenkins/
[root@mylinux1 jenkins]# ls
jenkins_cp.war  jenkins.war  ref

8. Start jenkins again (or restart the server directly)

systemctl start jenkins