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Currently, kubeadm would refuse to perfom an upgrade (or even planing for one) if it detects a user supplied unsupported component config version. Hence, users are required to manually upgrade their component configs and store them in the config maps prior to executing `kubeadm upgrade plan` or `kubeadm upgrade apply`. This change introduces the ability to use the `--config` option of the `kubeadm upgrade plan` and `kubeadm upgrade apply` commands to supply a YAML file containing component configs to be used in place of the existing ones in the cluster upon upgrade. The old behavior where `--config` is used to reconfigure a cluster is still supported. kubeadm automatically detects which behavior to use based on the presence (or absense) of kubeadm config types (API group `kubeadm.kubernetes.io`). Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>
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.