[root@localhost ~]# find / -name "default.json"
/var/lib/jenkins/updates/default.json
[root@localhost ~]# sed -i 's/http:\/\/updates.jenkins-ci.org\/download/https:\/\/mirrors.tuna.tsinghua.edu.cn\/jenkins/g' /var/lib/jenkins/updates/default.json && sed -i 's/http:\/\/www.google.com/https:\/\/www.baidu.com/g' /var/lib/jenkins/updates/default.json
[root@localhost ~]# service jenkins restart