This Jenkins instance appears to be offline

Tomcat mode when starting Jenkins, reported: This Jenkins instance appears to be offline and offers options to "Configure Proxy" or "Skip Plugin Installation "

There is a post online:

In the My case, it had something to does with SSL. I manage to fix it by editing '/var/lib/jenkins/hudson.model.updatecenter.xml ' and the change URL to use ' http ' instead of ' HTTPS '.

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

[[email protected] 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>

Directly wget HTTPSon the Jenkins server://updates.jenkins.io/update-center.json

[Email protected] jenkins]# wget https://updates.jenkins.io/update-center.json--2017-09-19 12:35:45--  https:// Updates.jenkins.io/update-center.jsonresolving Updates.jenkins.io ... 52.202.51.185Connecting 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

[[email protected] jenkins]# wget http://updates.jenkins.io/update-center.json--2017-09-19 12:36:30--/http Updates.jenkins.io/update-center.jsonresolving Updates.jenkins.io ... 52.202.51.185Connecting to updates.jenkins.io|52.202.51.185|:80 ... Connected. HTTP request sent, awaiting response ... 301 Moved Permanentlylocation:http://updates.jenkins.io/current/update-center.json [following]--2017-09-19 12:36:30--http://updates.jenkins.io/current/update-center.jsonReusing existing connection to Updates.jenkins.io : 80.HTTP request sent, awaiting response ... 302 Foundlocation: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.jsonResolving mirrors.jenkins-ci.org ... 52.202.51.185Reusing existing connection to Updates.jenkins.io:80.http request sent, awaiting response ... 302 Foundlocation: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.jsonResolving Mirrors.tuna.tsinghua.edu.cn ... 101.6.6.178, 2402:f000:1:416:101:6:6:177connecting to mirrors.tuna.tsinghua.edu.cn|101.6.6.178|:80 ... Connected. HTTP request sent, awaiting response ... oklength: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]

Really because of the problem of HTTPS, modify it to HTTP, restart Jenkins OK

　

This Jenkins instance appears to be offline