When I am using Travis-CI, I need to choose between LXD and full VM: https://docs.travis-ci.com/user/reference/overview/. Although the linked page describes their features in specific usages, I would like to ask how conceptually LXD differs from so-called full VM, and how do they compare with Docker? I would assume that a CI test should run on a server with Linux or other OS pre-installed and that we do not need to run a LXD or VM on the server side. So I am quite confused with the basic concepts of LXD or VM run on a server. Any clarification?
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