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When doing the very first upgrade from a cluster that contains the source of truth in the ClusterStatus struct, the new kubeadm logic will try to retrieve this information from annotations. This changeset adds to both etcd and apiserver endpoint retrieval the special case in which they won't retry if we are in such cases. The logic will retry if we find any unknown error, but will not retry in the following cases: - etcd annotations do not contain etcd endpoints, but the overall list of etcd pods is greater than 0. This means that we listed at least one etcd pod, but they are missing the annotation. - API server annotation is not found on the api server pod for a given node name, but no errors aside from that one were found. This means that the API server pod is present, but is missing the annotation. In both cases there is no point in retrying, and so, this speeds up the upgrade path when coming from a previous existing cluster.
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.