What is the difference between namespaces and cgroups?

Namespaces and cgroups are two key Linux mechanisms for isolation and resource management, but they address different tasks:

• Namespaces isolate various aspects of a process environment, creating separate namespace spaces for:

  • processes (PID namespace)
  • filesystem (Mount namespace)
  • network interfaces (Network namespace)
  • users (User namespace)
  • IPC, UTS, and others.

  This allows processes to see and interact only with their own isolated environment.

• Cgroups (control groups) manage and limit resource consumption (CPU, memory, disk, network) of a group of processes. With cgroups, you can:

  • limit CPU or memory usage
  • prioritize processes
  • monitor resource consumption.

Together, namespaces provide isolation, while cgroups offer control and resource limitation. For example, containers use namespaces for isolation and cgroups for resource management.