This Jenkins instance appears to be offline

错误复现

重新安装jenkins,输入安装命令

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$ java -jar jenkins.war --httpPort=8080

在浏览器输入localhost:8080打开界面,输入密码后页面显示如下错误

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This Jenkins instance appears to be offline
。。。

查看运行日志

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2019-10-18 06:31:30.849+0000 [id=55]	INFO	hudson.util.Retrier#start: Calling the listener of the allowed exception 'connect timed out' at the attempt #1 to do the action check updates server
2019-10-18 06:31:30.851+0000 [id=55] INFO hudson.util.Retrier#start: Attempted the action check updates server for 1 time(s) with no success
2019-10-18 06:31:30.851+0000 [id=55] SEVERE hudson.PluginManager#doCheckUpdatesServer: Error checking update sites for 1 attempt(s). Last exception was: SocketTimeoutException: connect timed out
2019-10-18 06:31:30.853+0000 [id=55] INFO hudson.model.AsyncPeriodicWork$1#run: Finished Download metadata. 20,156 ms
2019-10-18 06:31:31.539+0000 [id=28] WARNING hudson.model.UpdateCenter#updateDefaultSite: Upgrading Jenkins. Failed to update the default Update Site 'default'. Plugin upgrades may fail.
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问题在于jenkins无法正常升级

问题解决

参考:Jenkins 2.89.3 “This Jenkins instance appears to be offline”

修改文件~/.jenkins/hudson.model.UpdateCenter.xml

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<url>http://updates.jenkins.io/update-center.json</url>
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https修改为http。重新启动后恢复正常,进入插件下载页面

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