Updated: 2020-12-29

A namespace wraps a global system resource in an abstraction that makes it appear to the processes within the namespace that they have their own isolated instance of the global resource.

There are 7 namespaces in Linux:

  • Cgroup: cgroup = control group. Resource limiting, prioritization, accounting and control.
  • IPC: Inter-process Communication
  • Network: Network devices, ports, etc.
  • Mount: Mount points (of file systems)
  • PID: Process IDs
  • User: User and group IDs
  • UTS: UNIX Timesharing System, named after the data structure used to store info returned by uname system call. Isolates hostname and NIS domain name.