Zach's Kernel News
Zach's Kernel News

Chronicler Zack Brown reports on the latest news, views, dilemmas, and developments within the Linux kernel community.
Extending Containers
Marian Marinov noticed that if he ran multiple containers, they all shared the same process counters. In other words, if two containers used the same user ID numbers and group ID numbers, then the processes owned by those IDs, but on completely separate containers, would appear to be owned by the same user. This would mess with his ability to do process resource limiting on a per-container basis.
This situation caused problems for Marian, because his containers were all instantiated by an identical template (hence identical UID and GID numbers) that contained a large number of files for a particular project. Changing the ownerships of those files within the running container would be a very time consuming task, and abandoning his template would require a lot of redesign. He proposed modifying some kernel data structures to isolate each container's user namespace, so the process counters would see them as separate from each other.
Eric W. Biederman replied that the current behavior was actually intentional, and he felt it would be bad to have per-user namespace data structures in the kernel, although he did say that he'd been considering allowing resource limits that would detect the different containers and apply the limits appropriately.
[...]
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.

News
-
Kali Linux 2025.3 Released with New Hacking Tools
If you're a Kali Linux fan, you'll be glad to know that the third release of this famous pen-testing distribution is now available with updates for key components.
-
Zorin OS 18 Beta Available for Testing
The latest release from the team behind Zorin OS is ready for public testing, and it includes plenty of improvements to make it more powerful, user-friendly, and productive.
-
Fedora Linux 43 Beta Now Available for Testing
Fedora Linux 43 Beta ships with Gnome 49 and KDE Plasma 6.4 (and other goodies).
-
USB4 Maintainer Leaves Intel
Michael Jamet, one of the primary maintainers of USB4 and Thunderbolt drivers, has left Intel, leaving a gaping hole for the Linux community to deal with.
-
Budgie 10.9.3 Now Available
The latest version of this elegant and configurable Linux desktop aligns with changes in Gnome 49.
-
KDE Linux Alpha Available for Daring Users
It's official, KDE Linux has arrived, but it's not quite ready for prime time.
-
AMD Initiates Graphics Driver Updates for Linux Kernel 6.18
This new AMD update focuses on power management, display handling, and hardware support for Radeon GPUs.
-
AerynOS Alpha Release Available
With a choice of several desktop environments, AerynOS 2025.08 is almost ready to be your next operating system.
-
AUR Repository Still Under DDoS Attack
Arch User Repository continues to be under a DDoS attack that has been going on for more than two weeks.
-
RingReaper Malware Poses Danger to Linux Systems
A new kind of malware exploits modern Linux kernels for I/O operations.