mirror of https://github.com/k3s-io/k3s
30 lines
1.4 KiB
Go
30 lines
1.4 KiB
Go
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/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package antiaffinity provides the LimitPodHardAntiAffinityTopology
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// admission controller. It rejects any pod that specifies "hard"
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// (RequiredDuringScheduling) anti-affinity with a TopologyKey other
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// than v1.LabelHostname. Because anti-affinity is symmetric, without
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// this admission controller, a user could maliciously or accidentally
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// specify that their pod (once it has scheduled) should block other
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// pods from scheduling into the same zone or some other large
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// topology, essentially DoSing the cluster. In the future we will
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// address this problem more fully by using quota and priority, but
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// for now this admission controller provides a simple protection, on
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// the assumption that the only legitimate use of hard pod
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// anti-affinity is to exclude other pods from the same node.
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package antiaffinity // import "k8s.io/kubernetes/plugin/pkg/admission/antiaffinity"
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