72c1c6559e
It dawned on me that `needsFullSync` can never be false. `needsFullSync` was used to compare the set of nodes that were existing last time the node event handler was triggered, with the current set of node for this run. However, if `triggerNodeSync` gets called it's always because the set of nodes have changed due to a condition changing on one node, or a new node being added/removed. If `needsFullSync` can never be false then a lot of things in the service sync path was just spurious, for ex: `servicesToRetry`, `knownHosts`. Essentially: if we ever need to `triggerNodeSync` then the set of nodes have somehow changed and we always need to re-sync all services. Before this patch series there was a possibility for `needsFullSync` to be set to false. `shouldSyncNode` and the predicates used to list nodes were not aligned, specifically for Unschedulable nodes. This means that we could have been triggered by a change to the schedulable state but not actually computed any diffs between the old vs. new nodes. Meaning, whenever there was a change in schedulable state we would just try to re-sync all service updates that might have failed when we synced last time. But I believe this to be an overlooked coincidence, rather than something actually intended. |
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| SUPPORT.md | ||
Kubernetes (K8s)
Kubernetes, also known as K8s, 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 K8s
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 K8s
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.
Community Meetings
The Calendar has the list of all the meetings in Kubernetes community in a single location.
Adopters
The User Case Studies website has real-world use cases of organizations across industries that are deploying/migrating to Kubernetes.
Governance
Kubernetes project is governed by a framework of principles, values, policies and processes to help our community and constituents towards our shared goals.
The Kubernetes Community is the launching point for learning about how we organize ourselves.
The Kubernetes Steering community repo is used by the Kubernetes Steering Committee, which oversees governance of the Kubernetes project.
Roadmap
The Kubernetes Enhancements repo provides information about Kubernetes releases, as well as feature tracking and backlogs.