64c669bd0a
Kubelet cert rotation involves two certificate manager instances (one for client and one for server certs) and the log lines are identical and confusing. Since certificate manager is a utility library it is also inappropriate to simply assume klog output is sufficient. certificate.Manager now accepts a Name and Logf function on its config struct to identify the purpose of the manager and to provide a way to redirect where output should go. If Name is absent, the name is defaulted from the SignerName, and if that is not found then the name is set to "client auth" if that is a provided key usage, or "certificate" otherwise. If Logf is not provided it defaults to klog.V(2). as today. The name is printed in "foo: bar" form on every line, but can be converted to structured logging in the future. The log level is not customizable and it is up to the caller to decide whether that is an issue. Some log messages are slightly cleaned up to more clearly indicate their intent. One log message is removed in a utility function that was already at v(4) and less likely to be needed. The default behavior of the certificate manager is as before and the kubelet now identifies the server and client signerName as separate entities: I0414 19:07:33.590419 1539 certificate_manager.go:263] kubernetes.io/kube-apiserver-client-kubelet: Rotating certificates E0414 19:07:33.594154 1539 certificate_manager.go:464] kubernetes.io/kube-apiserver-client-kubelet: Failed while requesting a signed certificate from the master: cannot create certificate signing request: Post "https://...
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.