通过以下命令进入docker容器。

docker exec -it 容器id /bin/bash

在目录“/var”下面建一个Jenkins的文件夹，然后拉取最新Jenkins包。

root@jenkins:/var# mkdir jenkins
root@jenkins:/var# cd jenkins
root@jenkins:/var/jenkins# wget http://mirrors.jenkins.io/war/latest/jenkins.war

当Jenkins程序包下载好后，进入Jenkins的war包存放的路径，然后备份原来的war包，将新war包复制过来，删除原程序包。

root@jenkins:/var/jenkins# cd /usr/share/jenkins
root@jenkins:/usr/share/jenkins# mv jenkins.war jenkins.war.bak
root@jenkins:/usr/share/jenkins# cp /var/jenkins/jenkins.war .
root@jenkins:/usr/share/jenkins# rm -rf /var/jenkins/jenkins.war

退出docker容器，重启docker容器即可。

root@jenkins:/usr/share/jenkins# exit
[chg@centosy home]$ docker restart 容器id