8c16260160
PLEG and kubelet race when reading and sending pod status to the apiserver. PLEG inserts status into a cache, and then signals kubelet. Kubelet then eventually reads the status out of that cache, but in the mean time the status could have been changed by PLEG. When a pod exits, pod status will no longer include the pod's IP address because the network plugin/runtime will report "" for terminated pod IPs. If this status gets inserted into the PLEG cache before kubelet gets the status out of the cache, kubelet will see a blank pod IP address. This happens in about 1/5 of cases when pods are short-lived, and somewhat less frequently for longer running pods. To ensure consistency for properties of dead pods, copy an old status update's IP address over to the new status update if (a) the new status update's IP is missing and (b) all sandboxes of the pod are dead/not-ready (eg, no possibility for a valid IP from the sandbox). Fixes: https://github.com/kubernetes/kubernetes/issues/47265 |
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| build | ||
| cluster | ||
| cmd | ||
| docs | ||
| examples | ||
| federation | ||
| Godeps | ||
| hack | ||
| logo | ||
| pkg | ||
| plugin | ||
| staging | ||
| test | ||
| third_party | ||
| translations | ||
| vendor | ||
| .bazelrc | ||
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| .gitattributes | ||
| .gitignore | ||
| .kazelcfg.json | ||
| BUILD.bazel | ||
| CHANGELOG.md | ||
| code-of-conduct.md | ||
| CONTRIBUTING.md | ||
| labels.yaml | ||
| LICENSE | ||
| Makefile | ||
| Makefile.generated_files | ||
| OWNERS | ||
| OWNERS_ALIASES | ||
| README.md | ||
| Vagrantfile | ||
| WORKSPACE | ||
Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts, providing basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.
Kubernetes is hosted by the Cloud Native Computing Foundation (CNCF). If you are a company that wants to help shape the evolution of technologies that are container-packaged, dynamically-scheduled and microservices-oriented, consider joining the CNCF. For details about who's involved and how Kubernetes plays a role, read the CNCF announcement.
To start using Kubernetes
See our documentation on kubernetes.io.
Try our interactive tutorial.
Take a free course on Scalable Microservices with Kubernetes.
To start developing Kubernetes
The community repository hosts all information about building Kubernetes from source, how to contribute code and documentation, who to contact about what, etc.
If you want to build Kubernetes right away there are two options:
You have a working Go environment.
$ go get -d k8s.io/kubernetes
$ cd $GOPATH/src/k8s.io/kubernetes
$ make
You have a working Docker environment.
$ git clone https://github.com/kubernetes/kubernetes
$ cd kubernetes
$ make quick-release
If you are less impatient, head over to the developer's documentation.
Support
If you need support, start with the troubleshooting guide and work your way through the process that we've outlined.
That said, if you have questions, reach out to us one way or another.