Linux namespaces make it possible to run a whole range of applications on a single real machine and ensure no two of them can interfere with each other, without having to resort to using virtual machines. In a single-user computer, a single system environment may be fine. But on a server, where you may want to run multiple services, it is essential to security and stability that the services are as isolated from each other as possible.

https://www.toptal.com/linux/separation-anxiety-isolating-your-system-with-linux-namespaces

Separation Anxiety: A Tutorial for Isolating Your System with Linux Namespaces

Toptal engineer Mahmud Ridwan dives into the Linux kernel with this in-depth guide to Linux namespaces, and how you can use them to create robust isolated environments on your Linux machine.

^{Mahmud Ridwan (Toptal)}