Linux Linux Namespaces: Advanced Isolation (UTS, USER, IPC)

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Linux Namespaces: Advanced Isolation (UTS, USER, IPC)

Welcome back, Hack Tools Dark Community!

Continuing our deep dive into Linux namespaces, today we'll explore three more powerful types: UTS, USER, and IPC.

• ⏺ UTS Namespace - Your Own Hostname:
  Isolate the hostname and domain name, allowing each process to have its own identity.
  
  

  sudo unshare --uts /bin/bash
  hostname mynamespace
  hostname

  
  You can now change and see a new hostname inside the namespace without affecting the host machine.
• ⏺ USER Namespace - Map User and Group IDs:
  Enable processes to have a different set of user and group IDs inside the namespace, even allowing root privileges without affecting the host.
  
  

  sudo unshare --user --mount /bin/bash
  whoami

  
  Initially, you might see `nobody`, but you can map UID 0 (root) inside the namespace with advanced configuration.
• ⏺ IPC Namespace - Isolated Communication:
  Create a separate space for interprocess communication (shared memory, semaphores, message queues).
  
  

  sudo unshare --ipc /bin/bash
  ipcs

  
  Inside, IPC resources will be isolated — processes outside cannot interfere or access these shared memory segments.

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Disclaimer:
This post is for educational purposes only. Always ensure you have permission to perform namespace operations in your environment.

Join the discussion! Have you worked with USER namespace for container security? Share your stories and setups!