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== What are namespaces? == Namespaces are a feature of the linux kernel that allow different processes to have a different view on the filesystem. Normally there is just a single filesystem tree with different mounts here and there. Now with namespaces you can have different mounts/views for different processes. What does this mean? This means that if process A and process B are in different namespaces, (un-)mounting in one namespace does not affect the other namespace. When you mount something it only appears in the current namespace and if you unmount something it only disappears in the current namespace. A namespace is automagically destroyed once all processes using that namespace have died. All mounts are automagically unmounted in that namesapce, so you don't have to take care that some dead mounts hang around somewhere you can't access them and keep you from, for example, removing a media from your cdrom drive (of course you have to take care that all processes die ;)).
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