Namespaces

Wrap a process so it sees its own world.

In this interactive Linux lesson from Stencel Academy you don't just read — you type real commands like unshare --pid --net --mnt --uts bash, ps, hostname, ip addr and watch the machine respond on a live, animated map. It is part of the free How Linux Works course.

Before this lesson

Builds on: The Process Tree, fork() & exec().

What you'll practise

• lsns — List every namespace — note the fresh inode.
• readlink /proc/self/ns/net — A namespace is just an inode id.
• nsenter -t 2208 -n ip addr — Step into another process's namespace.
• cat /proc/self/uid_map — The user namespace maps container-root to an unprivileged host UID.

Terms you'll learn

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