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1) Do not fail in case a bind address cannot be obtained If netutil.ChooseBindAddress() fails looking up IP route tables it will fail with an error in which case the kubeadm config code will hard stop. This scenario is possible if the Linux user intentionally disables the WiFi from the distribution settings. In such a case the distro could empty files such files as /proc/net/route and ChooseBindAddress() will return an error. For improved offline support, don't error on such scenarios but instead show a warning. This is done by using the NoRoutesError type. Also default the address to 0.0.0.0. While doing that, prevent some commands like `init`, `join` and also phases like `controlplane` and `certs` from using such an invalid address. Add unit tests for the new function for address verification. 2) Fallback to local client version If there is no internet, label versions fail and this breaks air-gapped setups unless the users pass an explicit version. To work around that: - Remain using 'release/stable-x.xx' as the default version. - On timeout or any error different from status 404 return error - On status 404 fallback to using the version of the client via kubeadmVersion() Add unit tests for kubeadmVersion(). Co-authored-by: Alexander Kanevskiy <alexander.kanevskiy@intel.com> |
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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.