d8ee8e427e
The streamwatcher has a synchronization problem that may lead to a go routine blocking forever when closing a stream watch. This occasionally happens, when informers are cancelled together with the watch request using the stop channel, which leads to an increaing number of blocked go routines, if imformers are dynamicaly created and deleted again. The function `receive` checks under a lock whether the watch has been stopped, before an error is reported to the result channel. The problem here is, that in between the watcher might be stopped by calling the `Stop` method. In the actual code this is done by the `cache.Reflector` using the streamwatcher by a defer which is executed after the caller already stopped reading from the result channel. As a result the stopping flag might be set after the check and trying to send the error event blocks this send operation forever, because there will never be a receiver again. The fix introduces a dedicated local stop channel that is closed by the `Stop` method and used in a select statement together with the send operation to finally abort the loop. |
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Kubernetes (K8s)
Kubernetes, also known as K8s, is an open source system for managing containerized applications across multiple hosts. It provides 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 your company 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 K8s
See our documentation on kubernetes.io.
Try our interactive tutorial.
Take a free course on Scalable Microservices with Kubernetes.
To use Kubernetes code as a library in other applications, see the list of published components.
Use of the k8s.io/kubernetes module or k8s.io/kubernetes/... packages as libraries is not supported.
To start developing K8s
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.
mkdir -p $GOPATH/src/k8s.io
cd $GOPATH/src/k8s.io
git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make
You have a working Docker environment.
git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make quick-release
For the full story, 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.