sed -i.bak 's#http://updates.jenkins.io/download#https://mirror.tuna.tsinghua.edu.cn/jenkins#g' /var/jenkins_home/updates/default.json

sed -i 's#www.google.com#www.baidu.com#g' /var/jenkins_home/updates/default.json

https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json