Buildbot is a continuous integration system designed to automate the build/test cycle. By automatically rebuilding and testing the tree each time something has changed, build problems are pinpointed quickly, before other developers are inconvenienced by the failure.
When running 'make hack' at the docker root directory, it spawns a virtual machine in the background running a buildbot instance and adds a git post-commit hook that automatically run docker tests for you.
You can check your buildbot instance at http://192.168.33.21:8010/waterfall
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