3f887171dd
Automatic merge from submit-queue (batch tested with PRs 49358, 49253)
Remove hostname label condition in SchedulerPredicates
**What this PR does / why we need it**:
```
validates that NodeSelector is respected if matching [Conformance]
validates that required NodeAffinity setting is respected if matching
```
The two tests above make the assumption that the node names are equal to the `kubernetes.io/hostname` labels. Unfortunately, this is not necessarily true all the time. For instance, when using the AWS Cloud Provider + Container Linux:
- The node name is set using the AWS SDK's `ec2.Instance.PrivateDnsName` and has the form `ip-10-0-35-57.ca-central-1.compute.internal` [[1](https://github.com/kubernetes/kubernetes/blob/v1.7.1/pkg/cloudprovider/providers/aws/aws.go#L3343-L3346)] [[2](https://raw.githubusercontent.com/aws/aws-sdk-go/master/service/ec2/api.go)]
- The node's hostname, however, is a simple call to `os.Hostname()`, itself reading `/proc/sys/kernel/hostname`, which contains what the AWS DHCP assigned to the instance, typically the hostname short-form: `ip-10-0-16-137`. [[1](https://github.com/kubernetes/kubernetes/blob/v1.7.1/pkg/util/node/node.go#L43-L54)]
Consequently, we are trying to assign a pod to a node having the following label: `kubernetes.io/hostname=ip-10-0-35-57.ca-central-1.compute.internal` (in addition to the randomly generated label), whereas the actual label on the node is `kubernetes.io/hostname=ip-10-0-35-57`.
Furthermore, this inaccurate `kubernetes.io/hostname=<nodename>` condition is actually useless given we already match over a random label, that was assigned to that node. Later, the test ensures that the scheduled pod was scheduled to the right node by comparing the pod's node name and the node name we expected the pod to be on:
```
framework.ExpectNoError(framework.WaitForPodNotPending(cs, ns, labelPodName))
labelPod, err := cs.Core().Pods(ns).Get(labelPodName, metav1.GetOptions{})
framework.ExpectNoError(err)
Expect(labelPod.Spec.NodeName).To(Equal(nodeName))
```
The `k8s.io/apimachinery/pkg/types/nodename` data structure actually [warns](
|
||
|---|---|---|
| .github | ||
| Godeps | ||
| api | ||
| build | ||
| cluster | ||
| cmd | ||
| docs | ||
| examples | ||
| federation | ||
| hack | ||
| logo | ||
| pkg | ||
| plugin | ||
| staging | ||
| test | ||
| third_party | ||
| translations | ||
| vendor | ||
| .bazelrc | ||
| .generated_files | ||
| .gitattributes | ||
| .gitignore | ||
| .kazelcfg.json | ||
| BUILD.bazel | ||
| CHANGELOG.md | ||
| CONTRIBUTING.md | ||
| LICENSE | ||
| Makefile | ||
| Makefile.generated_files | ||
| OWNERS | ||
| OWNERS_ALIASES | ||
| README.md | ||
| Vagrantfile | ||
| WORKSPACE | ||
| code-of-conduct.md | ||
| labels.yaml | ||
README.md
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
If you are less impatient, 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.