Apologies if this is the wrong place to ask this question.

Are the the details in the comment above definitely true?

• Is this an Apache regression?
• Is there a matching bug logged against the httpcomponents library?
• Is someone (Apache?) missing a regression test? Or is this an unsupported use of that library and docker-plugin should change?

Are the the details in the comment above definitely true?

The details that are posted are true as far as I have been able to determine. The Jenkins docker-plugin fails automated tests when those tests are configured to run with Apache httpclient 5 API plugin 5.4-118.v199115451c4d. They pass when those tests are configured to run with Apache httpclient 5 library 5.3.1-110.v77252fb_d4da_5. Users have reported that the docker-plugin fails in production when attempting to use a Unix domain socket if the Apache httpclient 5 API plugin 5.4-118.v199115451c4d is used.

* Is this an Apache regression?

Yes, as far as I can tell, this is a regression in the Apache httpclient 5 API plugin 5.4-118.v199115451c4d, since that is the only component that changed from the working case to the non-working case.

* Is there a matching bug logged against the httpcomponents library?

Not for this case. I've not yet taken the time to extract enough details for a bug report to the httpclient issue tracker. Are you interested in doing that investigation and submitting the issue? I don't have an account on the Apache issue tracker.

* Is someone (Apache?) missing a regression test? Or is this an unsupported use of that library and docker-plugin should change?

I assume there is a missing test because this is the second release of Apache httpclient 5 that has broken the Jenkins docker-plugin use through the docker-java library. Are you offering to investigate further?

> Are you offering to investigate further?

I'll see if I can get some time this weekend - I'm a C++ developer, not a Java developer and only did some poking around with Jenkins plugin development for a few weeks a few years back. I'm not promising anything productive

Apache httpcomponents 5.4-124.v31e2987e48f4 has released with a revert to httpclient library 5.3.1. That was done with PR-62.

No upstream issue has been submitted yet. I hope to spend time on that tomorrow.

Upstream issue has been submitted by Basil and a pull request has been submitted to the docker-java library to resolve the issue. Waiting for a response from the maintainers of the docker-java library.

Hi there.

The problem persists in Jenkins 2.479.3: https://issues.jenkins.io/browse/JENKINS-75460.

But even worse is that in Jenkins 2.479.3, the minumum versions of the plugins are:

DockerVersione1.6.2 which requires a minimum of
Docker API PluginVersione3.4.1-96.v77147a_de67f8 which requires a minimum of
Apache HttpComponents Client 5.x API PluginVersione5.4-136.v5a_21779c63f8
So, downgrading to Apache HttpComponents Client 5.x API PluginVersione5.3.1-110.v77252fb_d4da_5 is not possible:

giuliano I think that you are confusing two different conditions.

The issue reported by this bug is that connections to the Docker agent are not allowed over a Unix domain socket. Unix domain sockets are only available when communication is on a single host. This issue is still resolved in the Apache HTTPComponents Client 5 API release 5.4-136.v5a_21779c63f8 because that API plugin provides Apache HTTPComponents Client 5 API release 5.3.3. It has intentionally been held at 5.3.3 inside the API library because of the change in behavior.

The issue you are reporting in JENKINS-75460 does not use a Unix domain socket. JENKINS-75460 is using a TCP connection, not a Unix domain socket. It is a different issue.

Hello,

as for my original issue, it is now solved because I waited some months and new versions of the plugin have been released.

So we can close the issue, at least on my side.

thank you

theunabledeveloper Thanks for confirming that the plugin is working for your case. I've kept the issue open while we wait for a permanent fix in the docker java API library. A pull request has been submitted that uses a different API but it needs to be merged and released.

Fixed in Docker Java API https://plugins.jenkins.io/docker-java-api/releases/#version_3.5.0-108.v211cdd21c383 and in https://github.com/jenkinsci/apache-httpcomponents-client-5-api-plugin/releases/tag/5.4.3-140.v2516ccde99e7