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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Kube-dns configmap translation to CoreDNS **What this PR does / why we need it**: Translation of kube-dns ConfigMap (StubDomains and UpstreamNameserver) to equivalent Proxy in CoreDNS. **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes kubernetes/kubeadm#662 **Special notes for your reviewer**: Currently, the translation is done as follows: Example ConfigMap of kube-dns. ``` apiVersion: v1 data: federations: | {"foo" : "foo.feddomain.com"} stubDomains: | {"abc.com" : ["1.2.3.4"], "my.cluster.local" : ["2.3.4.5"]} upstreamNameservers: | ["8.8.8.8", "8.8.4.4"] kind: ConfigMap metadata: creationTimestamp: 2018-01-22T20:21:56Z name: kube-dns namespace: kube-system ``` CoreDNS Corefile after translation. ``` .:53 { errors health kubernetes cluster.local in-addr.arpa ip6.arpa { upstream 8.8.8.8 8.8.4.4 pods insecure fallthrough in-addr.arpa ip6.arpa } federation cluster.local { foo foo.feddomain.com } prometheus :9153 proxy . 8.8.8.8 8.8.4.4 cache 30 } abc.com:53 { errors cache 30 proxy . 1.2.3.4 } my.cluster.local:53 { errors cache 30 proxy . 2.3.4.5 } ``` **Release note**: ```release-note Kubeadm: CoreDNS supports migration of the kube-dns configuration to CoreDNS configuration when upgrading the service discovery from kube-dns to CoreDNS as part of Beta. ``` |
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Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts; providing 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 you are a company that 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 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.
$ go get -d k8s.io/kubernetes
$ cd $GOPATH/src/k8s.io/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.