Jenkins Docker Behind Reverse Proxy Adds “:80” to the URL

Question

The Jenkins container redirects to URL:80, which is causing an error. When I remove the :80, everything is working as it should.

I have tried the proxy with a simple web app and there were no issues.

This is the docker-compose.yml https://pastebin.com/djJTuBZL.

The cert is correctly issued and the connection is secured. The host I'm using is live and correctly configured with ports 80 and 443 open.

The container exposes 8080 and this is the same as the VIRTUAL_PORT.

Also, I would have assumed that accessing an address with :80 wouldn't have caused any issues this being the standard HTTP port eg www.google.com:80; unless I'm missing something.

If this helps this is the logs when I run docker-compose up https://pastebin.com/NUbDL7PC. Here are the logs when I try to do the first login, the space is before I remove the :80 then load the page https://pastebin.com/0wxGDBzi.

How can I resolve this problem?

Answer 1

If it's a brand new Jenkins, you can try creating an SSH tunnel directly into the container with port 8080 and checking if the problem also appears there. That will at least allow you to check if it's Jenkins redirecting you or Nginx.

There you can also try adjusting "Jenkins URL" in "Manage Jenkins" -> "Configure System".

Alternatively, check jenkins_home/jenkins.model.JenkinsLocationConfiguration.xml. jenkinsUrl tag is also present there.