Today I'm investigating Linux namespaces, the feature that makes one machine look like several and it is a fundamental part of the containers technology. You can run `sudo unshare --uts bash`, change the hostname in there, and a second terminal still sees the old one. Same machine, same kernel, same gethostname() call, two different answers. We will go deep on how that magic works. The article will be published tomorrow. Want these articles directly in your inbox? Subscribe to the newsletter: internals-for-interns.com/ne… #Linux #Containers #Namespaces