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kube-controller-manager. If a service CIDR that overlaps with the cluster CIDR is specified to kube-controller-manager then kube-controller- manager will incorrectly allocate node CIDRs that overlap with the service CIDR. The fix ensure that kubeadm maps the --service-cidr to --service-cluster-ip-range for use by kube-controller-manager. As per docs, --allocate-node-cidrs must be true for --service-cluster-ip-range to be considered. It does not make sense for --cluster-cidr to be unspecified but for --service-cluster-ip-range and --allocate-node-cidrs to be set, since the purpose of these options is to have the controller-manager do the per node CIDR allocation. Also note that --service-cluster-ip-range is passed to the api-server, so the presence of *just* --service-cluster-ip-range should not imply that --allocate-node-cidrs should be true. Resolves: kubernetes/kubeadm/issues/1591
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.