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
-
Fedora 45 Now Available
The latest iteration of Fedora has arrived with Gnome 51 and KDE Plasma 6.8.
-
Linux 7.4 is "Much Healthier" Thanks to AI
At nearly 42 million lines, Linux 7.4 is the largest merge in the kernel’s history.
-
Working Exploit for a Linux Kernel Flaw Made Public
Even before a bug received its CVE identifier or an upstream fix, the local privilege escalation vulnerability exploit found its way into the wild.
-
r/opensource Bans AI-Assisted and AI-Related Projects
The de facto subreddit for all things open source has not only banned AI-related projects but also users who "don't speak English."
-
Bottlenecks Discovered by Meta Engineers Lead to Scalability Improvements
Thanks to a small group of engineers at Meta, the Linux kernel module kernfs has been improved, which has led to some serious gains.
-
PwnEscape Poses VM Vulnerability
A guest-to-host escape flaw in Linux KVM, named PwnEscape, might be yet another means of attacking Linux.
-
Linux Mint 27 Set for a Christmas Release
The developers behind Linux Mint have announced a Christmas release, and it looks like Santa's sack will be brimming with features.
-
Is Linus Torvalds Vibe Coding?
The creator of Linux has added AI into his process for Linux kernel development, and it's more than just for debugging.
-
openKylin 3.0 Released with Expanded AI Integration
The latest release features a pre-installed AI agent to help perform tasks.
-
DigitalOcean Ends Open Source Credits Program
In a change that has surprised many open source developers, DigitalOcean has decided to sunset its Open Source Credits Program.