How many namespaces were originally added to the Linux kernel in 2002?

How many namespaces were originally added to the Linux kernel in 2002?

• A. 4
• B. 6
• C. 8
• D. 10

Answer: (B)

Namespaces give processes their own isolated views of system resources, enabling container-like separation without full virtualization. In 2002, the Linux kernel introduced six distinct namespaces to provide this kind of isolation. These six are: mount namespace (separate mount points), PID namespace (independent process ID space), UTS namespace (separate hostname and NIS domain name), IPC namespace (separate interprocess communication resources), network namespace (own network stack and interfaces), and user namespace (maps and isolates user and group IDs). By combining these, a process can run with its own filesystem view, process space, hostname, IPC resources, network stack, and user ID mappings. That’s why six is the correct count.

Namespaces give processes their own isolated views of system resources, enabling container-like separation without full virtualization. In 2002, the Linux kernel introduced six distinct namespaces to provide this kind of isolation. These six are: mount namespace (separate mount points), PID namespace (independent process ID space), UTS namespace (separate hostname and NIS domain name), IPC namespace (separate interprocess communication resources), network namespace (own network stack and interfaces), and user namespace (maps and isolates user and group IDs). By combining these, a process can run with its own filesystem view, process space, hostname, IPC resources, network stack, and user ID mappings. That’s why six is the correct count.