4f8fb1d3ca
Service has had a problem since forever: - User creates a service type=LoadBalancer - We silently allocate them a NodePort - User changes type to ClusterIP - We fail the operation because they did not clear NodePort They never asked for or used the NodePort! Dual-stack introduced some dependent fields that get auto-wiped on updates. This carries it further. If you squint, you can see Service as a big, messy discriminated union, with type as the discriminator. Ignoring fields for non-selected union-modes seems right. This introduces the potential for an apply loop. Specifically, we will accept YAML that we did not previously accept. Apply could see the field in local YAML and not in the server and repeatedly try to patch it in. But since that YAML is currently an error, it seems like a very low risk. Almost nobody actually specifies their own NodePort values. To mitigate this somewhat, we only auto-wipe on updates. The same YAML would fail to create. This is a little inconsistent. We could auto-wipe on create, too, at the risk of more potential impact. To do this properly, we need to know the old and new values, which means we can not do it in defaulting or conversion. So we do it in strategy. This change also adds unit tests and updates e2e tests to rely on and verify this behavior.
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.