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All modern distros set up /run to be a tmpfs, see for instance: https://wiki.debian.org/ReleaseGoals/RunDirectory Its a very useful place to store pid-files, sockets and other things that only live at runtime and that should not be stored in the image. This is also useful when running systemd inside a container, as it will try to mount /run if not already mounted, which will fail for non-privileged container. Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)