What isolation methods does Linux provide for containers?

Linux provides several isolation mechanisms used for containerization:

• Namespaces — isolate various aspects of the system:

  • PID namespace — process isolation.
  • Mount namespace — filesystem isolation.
  • Network namespace — network interface isolation.
  • UTS namespace — hostname and domain name isolation.
  • IPC namespace — inter-process communication isolation.
  • User namespace — user and group isolation.

• Control Groups (cgroups) — limit and control resource usage (CPU, memory, disk, network) for a group of processes.

• Capabilities — restrict process privileges, reducing rights compared to root.

• Seccomp — system call filtering for enhanced security.

Together, these mechanisms provide isolation and control, enabling containers to run with limited resources and minimal privileges, which enhances security and manageability.