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I will look at the following use cases for why you might want to do something like this: As the name implies, you can use this namespace to manage the network stack inside of a namespace. This article looks at the namespace I get asked about the most: the net namespace. The user namespace is most often used in combination with the other namespaces to provide a greater level of isolation than would otherwise be possible. There are obvious limitations regarding the tasks these namespaces can accommodate, as they do not have root on the host.

Among other things, this is useful for creating a namespace as an unprivileged user that can still be root in the namespace. The user namespace allows processes to run as specific users.Not only is this useful for creating and managing processes on a host, but it is also beneficial when creating Linux containers.

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The mount namespace has many uses for constructing namespaces that do not have full access to the host's filesystem.

It also allows running multiple versions of an application that relies on isolated process trees. This is valuable if you have a complicated environment where you use the Linux kernel's freeze functionality, which allows you to pause a process and resume it on a different host.

The PID namespace is quite useful for isolating processes from each other.

This feature is mainly useful in the container context and not extremely useful on its own. With the UTS namespace, you can change the hostname or the Network Information Service (NIS) domain that a process reports.

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