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Until now, users were always asked to manually convert a component config to a version supported by kubeadm, if kubeadm is not supporting its version. This is true even for configs generated with older kubeadm versions, hence getting users to make manual conversions on kubeadm generated configs. This is not appropriate and user friendly, although, it tends to be the most common case. Hence, we sign kubeadm generated component configs stored in config maps with a SHA256 checksum. If a configs is loaded by kubeadm from a config map and has a valid signature it's considered "kubeadm generated" and if a version migration is required, this config is automatically discarded and a new one is generated. If there is no checksum or the checksum is not matching, the config is considered as "user supplied" and, if a version migration is required, kubeadm will bail out with an error, requiring manual config migration (as it's today). The behavior when supplying component configs on the kubeadm command line does not change. Kubeadm would still bail out with an error requiring migration if it can recognize their groups but not versions. 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.