Which Linux feature is responsible for isolating mount points within a namespace?

Which Linux feature is responsible for isolating mount points within a namespace?

• A. Mount namespace
• B. Network namespace
• C. User namespace
• D. IPC namespace

Answer: (A)

Mounts are the part of the filesystem view that a process experiences, and Linux uses namespaces to give processes isolated views of resources. The feature that isolates the set of mounted filesystems for a group of processes is the mount namespace. By creating a separate mount namespace, you create a distinct mount table for that namespace, so processes inside it can have different mounts (or none at all) from processes outside it. This is the mechanism containers rely on to provide separate filesystem views, allowing for independent mounting, remounting, and unmounting without affecting other namespaces. The other options describe different kinds of isolation: a network namespace provides separate network interfaces and routing tables, a user namespace maps user and group IDs between namespaces, and an IPC namespace isolates inter-process communication resources like System V IPC and POSIX message queues.

Mounts are the part of the filesystem view that a process experiences, and Linux uses namespaces to give processes isolated views of resources. The feature that isolates the set of mounted filesystems for a group of processes is the mount namespace. By creating a separate mount namespace, you create a distinct mount table for that namespace, so processes inside it can have different mounts (or none at all) from processes outside it. This is the mechanism containers rely on to provide separate filesystem views, allowing for independent mounting, remounting, and unmounting without affecting other namespaces.

The other options describe different kinds of isolation: a network namespace provides separate network interfaces and routing tables, a user namespace maps user and group IDs between namespaces, and an IPC namespace isolates inter-process communication resources like System V IPC and POSIX message queues.