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The service allocator is used to allocate ip addresses for the Service IP allocator and NodePorts for the Service NodePort allocator. It uses a bitmap backed by etcd to store the allocation and tries to allocate the resources directly from the local memory instead from etcd, that can cause issues in environment with high concurrency. It may happen, in deployments with multiple apiservers, that the resource allocation information is out of sync, this is more sensible with NodePorts, per example: 1. apiserver A create a service with NodePort X 2. apiserver B deletes the service 3. apiserver A creates the service again If the allocation data of apiserver A wasn't refreshed with the deletion of apiserver B, apiserver A fails the allocation because the data is out of sync. The Repair loops solve the problem later, but there are some use cases that require to improve the concurrency in the allocation logic. We can try to not do the Allocation and Release operations locally, and try instead to check if the local data is up to date with etcd, and operate over the most recent version of the data.
Kubernetes
Kubernetes 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 Kubernetes
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 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.
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.