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需要你进入jenkins的工作目录

vim .jenkins/hudson.model.UpdateCenter.xml

将https://updates.jenkins.io/update-center.json更换为更改为https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json

<?xml version='1.1' encoding='UTF-8'?>
<sites>
  <site>
    <id>default</id>
    <url>https://updates.jenkins.io/update-center.json</url>
  </site>
</sites>