14fe7225c1
CreateOrMutateConfigMap was not resilient when it was trying to Create the ConfigMap. If this operation returned an unknown error the whole operation would fail, because it was strict in what error it was expecting right afterwards: if the error returned by the Create call was a IsAlreadyExists error, it would work fine. However, if an unexpected error (such as an EOF) happened, this call would fail. We are seeing this error specially when running control plane node joins in an automated fashion, where things happen at a relatively high speed pace. It was specially easy to reproduce with kind, with several control plane instances. E.g.: ``` [upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace I1130 11:43:42.788952 887 round_trippers.go:443] POST https://172.17.0.2:6443/api/v1/namespaces/kube-system/configmaps?timeout=10s in 1013 milliseconds Post https://172.17.0.2:6443/api/v1/namespaces/kube-system/configmaps?timeout=10s: unexpected EOF unable to create ConfigMap k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient.CreateOrMutateConfigMap /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient/idempotency.go:65 ``` This change makes this logic more resilient to unknown errors. It will retry on the light of unknown errors until some of the expected error happens: either `IsAlreadyExists`, in which case we will mutate the ConfigMap, or no error, in which case the ConfigMap has been created.
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.