This Jenkins instance appears to be offline

时间：2023-03-08 19:49:23

tomcat 方式启动jenkins时，报：This Jenkins instance appears to be offline and offers options to "Configure Proxy" or "Skip Plugin Installation"

网上有个帖子：

In my case, it has something to do with SSL. I manage to fix it by editing `/var/lib/jenkins/hudson.model.UpdateCenter.xml` and change url to use `http` instead of `https`.

Restart jenkins and reload the website, it no longer shows offline.

[root@server-test jenkins]# find / -name "hudson.model.UpdateCenter.xml"

/work/data/jenkins/hudson.model.UpdateCenter.xml

　

<?xml version='1.0' encoding='UTF-8'?>

<sites>

  <site>

    <id>default</id>

    <url>https://updates.jenkins.io/update-center.json</url>

  </site>

</sites>

在jenkins服务器 直接 wget https://updates.jenkins.io/update-center.json

[root@server-test jenkins]# wget https://updates.jenkins.io/update-center.json

--2017-09-19 12:35:45--  https://updates.jenkins.io/update-center.json

Resolving updates.jenkins.io... 52.202.51.185

Connecting to updates.jenkins.io|52.202.51.185|:443... connected.

ERROR: certificate common name “pkg.jenkins.io” doesn’t match requested host name “updates.jenkins.io”.

To connect to updates.jenkins.io insecurely, use ‘--no-check-certificate’.

wget http://updates.jenkins.io/update-center.json

[root@server-test jenkins]# wget http://updates.jenkins.io/update-center.json

--2017-09-19 12:36:30--  http://updates.jenkins.io/update-center.json

Resolving updates.jenkins.io... 52.202.51.185

Connecting to updates.jenkins.io|52.202.51.185|:80... connected.

HTTP request sent, awaiting response... 301 Moved Permanently

Location: http://updates.jenkins.io/current/update-center.json [following]

--2017-09-19 12:36:30--  http://updates.jenkins.io/current/update-center.json

Reusing existing connection to updates.jenkins.io:80.

HTTP request sent, awaiting response... 302 Found

Location: http://mirrors.jenkins-ci.org/updates/current/update-center.json [following]

--2017-09-19 12:36:31--  http://mirrors.jenkins-ci.org/updates/current/update-center.json

Resolving mirrors.jenkins-ci.org... 52.202.51.185

Reusing existing connection to updates.jenkins.io:80.

HTTP request sent, awaiting response... 302 Found

Location: http://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/current/update-center.json [following]

--2017-09-19 12:36:31--  http://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/current/update-center.json

Resolving mirrors.tuna.tsinghua.edu.cn... 101.6.6.178, 2402:f000:1:416:101:6:6:177

Connecting to mirrors.tuna.tsinghua.edu.cn|101.6.6.178|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 1229441 (1.2M) [application/json]

Saving to: “update-center.json”

100%[=====================================================================================================================================================>] 1,229,441   2.43M/s   in 0.5s    

2017-09-19 12:36:32 (2.43 MB/s) - “update-center.json” saved [1229441/1229441]

　　确实是因为https的问题，把它修改成http，重启jenkins就OK了