| /* |
| Copyright 2016 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| // Package antiaffinity provides the LimitPodHardAntiAffinityTopology |
| // admission controller. It rejects any pod that specifies "hard" |
| // (RequiredDuringScheduling) anti-affinity with a TopologyKey other |
| // than v1.LabelHostname. Because anti-affinity is symmetric, without |
| // this admission controller, a user could maliciously or accidentally |
| // specify that their pod (once it has scheduled) should block other |
| // pods from scheduling into the same zone or some other large |
| // topology, essentially DoSing the cluster. In the future we will |
| // address this problem more fully by using quota and priority, but |
| // for now this admission controller provides a simple protection, on |
| // the assumption that the only legitimate use of hard pod |
| // anti-affinity is to exclude other pods from the same node. |
| package antiaffinity // import "k8s.io/kubernetes/plugin/pkg/admission/antiaffinity" |
