29 lines
1.4 KiB
Go
29 lines
1.4 KiB
Go
|
/*
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
// LimitPodHardAntiAffinityTopology admission controller rejects any pod
|
||
|
|
// that specifies "hard" (RequiredDuringScheduling) anti-affinity
|
||
|
|
// with a TopologyKey other than metav1.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"
|