b975573385
Co-Authored-By: Weibin Lin <linweibin1@huawei.com> Change-Id: I163b2f2833e6b8767f72e2c815dcacd0f4e504ea
29 lines
1.4 KiB
Go
29 lines
1.4 KiB
Go
/*
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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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// LimitPodHardAntiAffinityTopology admission controller rejects any pod
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// that specifies "hard" (RequiredDuringScheduling) anti-affinity
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// with a TopologyKey other than v1.LabelHostname.
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// Because anti-affinity is symmetric, without this admission controller,
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// a user could maliciously or accidentally specify that their pod (once it has scheduled)
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// should block other pods from scheduling into the same zone or some other large topology,
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// essentially DoSing the cluster.
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// In the future we will address this problem more fully by using quota and priority,
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// but for now this admission controller provides a simple protection,
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// on the assumption that the only legitimate use of hard pod anti-affinity
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// 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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