Set "path to docker context" field to "." and set "Dockerfile" field to "Dockerfile" and try a build, and get:

{{Build Docker image from ./Dockerfile ...
$ docker build --tag 6ae96f119c2701896c3890ff49f07078bcdcac37 --file Dockerfile /home/jenkins/workspace/cloud-acceptance
unable to prepare context: unable to evaluate symlinks in Dockerfile path: lstat /home/jenkins/Dockerfile: no such file or directory
[ssh-agent] Stopped.
FATAL: Failed to build docker image from project Dockerfile
java.lang.RuntimeException: Failed to build docker image from project Dockerfile
at com.cloudbees.jenkins.plugins.docker_build_env.Docker.buildImage(Docker.java:127)
at com.cloudbees.jenkins.plugins.docker_build_env.DockerfileImageSelector.prepareDockerImage(DockerfileImageSelector.java:41)
at com.cloudbees.jenkins.plugins.docker_build_env.DockerBuildWrapper.setUp(DockerBuildWrapper.java:167)
at hudson.model.Build$BuildExecution.doRun(Build.java:156)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
at hudson.model.Run.execute(Run.java:1738)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:410)
}}

If I set "Dockerfile" field to "/home/jenkins/workspace/cloud-acceptance/Dockerfile" it builds without a problem.

Either the build command needs to be run in the project workspace directory or the full path to the Dockerfile should be passed to the build command.

Alternatively, docs should just clarify that the full path is needed and default to something useful (is there a variable that can be used in this field that contains the project workspace directory?)