Linux Advanced

What is Namespace?

A Linux kernel feature that provides process isolation by creating separate instances of global system resources.

Namespaces isolate what a process can see. Types include PID (process IDs), network (network stack), mount (filesystem), user (user/group IDs), UTS (hostname), and IPC (inter-process communication).

Together with cgroups, namespaces form the foundation of Linux containers. Docker creates a set of namespaces for each container, giving it an isolated view of the system while sharing the host kernel.

Related Terms

The traditional Linux firewall tool that filters network packets using configurable chains of rules organized in tables.

A command-line tool for querying and viewing logs collected by systemd's journal logging system.

A Linux kernel feature that limits, accounts for, and isolates resource usage of process groups.

A stream editor for filtering and transforming text, commonly used for find-and-replace operations in files.

Linux Kernel Module

A piece of code that can be loaded into the kernel at runtime to extend functionality without rebooting, such as device drivers and filesystems.

File Permissions

A security mechanism that controls who can read, write, or execute files and directories in Unix-like systems.

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