Aleksei Sviridkin
827f4e7e10
Every CPU reading on this failure path describes a subject inside the sandbox -- a cgroup, a QEMU thread, a node's own /proc/stat -- and all of them can report a guest that was handed its ticks while the guest gets no work done. None of them can say what a tick cost. That price is paid one layer down: a tenant worker is a guest of a sandbox node, which is itself a guest of the runner, and the runner's kernel absorbs the exits, nested page faults and TLB flushes the arrangement provokes. Read those counters from the debugfs that kernel publishes them in. The suite runs in a container sharing it, so this is a local read rather than a walk over nodes, which is what makes it affordable at all: the phase budget has no room left for a further per-node read. debugfs is mounted in a mount namespace belonging to the call, so nothing is left behind for the twenty minutes of suite that follow it. The pair is taken across the node-join wait rather than inside the diagnostics block: once before the wait on every run, once after it on the failing path and on the passing one. The counters are running totals -- per-VM since that VM was created, kernel-wide summed over the VMs alive at the read -- so the interval a difference divides by becomes the window the guest was failing to boot in, and a passing run leaves a baseline to read the failing ones against. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Aleksei Sviridkin <3811295@gmail.com>
Cozystack
Cozystack is a free platform and framework for building clouds.
Cozystack is a CNCF Sandbox Level Project that was originally built and sponsored by Ænix.
With Cozystack, you can transform a bunch of servers into an intelligent system with a simple REST API for spawning Kubernetes clusters, Database-as-a-Service, virtual machines, load balancers, HTTP caching services, and other services with ease.
Use Cozystack to build your own cloud or provide a cost-effective development environment.
Use-Cases
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Using Cozystack to build a public cloud
You can use Cozystack as a backend for a public cloud -
Using Cozystack to build a private cloud
You can use Cozystack as a platform to build a private cloud powered by Infrastructure-as-Code approach -
Using Cozystack as a Kubernetes distribution
You can use Cozystack as a Kubernetes distribution for Bare Metal
Documentation
The documentation is located on the cozystack.io website.
Read the Getting Started section for a quick start.
If you encounter any difficulties, start with the troubleshooting guide and work your way through the process that we've outlined.
Versioning
Versioning adheres to the Semantic Versioning principles.
A full list of the available releases is available in the GitHub repository's Release section.
Contributions
Contributions are highly appreciated and very welcomed!
In case of bugs, please check if the issue has already been opened by checking the GitHub Issues section. If it isn't, you can open a new one. A detailed report will help us replicate it, assess it, and work on a fix.
You can express your intention to on the fix on your own. Commits are used to generate the changelog, and their author will be referenced in it.
If you have a concrete feature request, open an issue. For a cross-cutting or architectural change, open a design proposal in the community repo. For questions or early ideas, use GitHub Discussions. See CONTRIBUTING.md for the full routing.
Community
You are welcome to join our Telegram group and come to our weekly community meetings. Add them to your Google Calendar or iCal for convenience.
License
Cozystack is licensed under Apache 2.0.
The code is provided as-is with no warranties.
Commercial Support
A list of companies providing commercial support for this project can be found on official site.