Difference between revisions of "Kubernetes pod affinity and anti affinity"

Latest revision as of 07:23, 25 July 2024

https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/#affinity-and-anti-affinity

Elasticsearch PodAntiAffinity official example

0/11 nodes are available: 1 Insufficient cpu, 1 Too many pods, 10 nodes(s) didn't match Pod's node affinity/selector
0/2 nodes are available: 1 Too many pods, 1 nodes(s) didn't match Pod's node affinity/selector
0/24 nodes are available: 0/24 nodes are available: 1 node(s) didn't match pod anti-affinity rules, 1 node(s) were unschedulable, 2 node(s) had taint {node.kubernetes.io/not-ready}, that the pod did not tolerate, 20 node(s) didn't match Pod's node affinity/selector.

Too many pods, 1 nodes(s) didn't match Pod's node affinity/selector

Official examples[edit]

https://raw.githubusercontent.com/kubernetes/website/main/content/en/examples/pods/pod-with-node-affinity.yaml

apiVersion: v1
kind: Pod
metadata:
  name: with-node-affinity
spec:
  affinity: 
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: topology.kubernetes.io/zone
            operator: In
            values:
            - antarctica-east1
            - antarctica-west1
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: another-node-label-key
            operator: In
            values:
            - another-node-label-value
  containers:
  - name: with-node-affinity
    image: registry.k8s.io/pause:2.0
apiVersion: v1
kind: Pod
metadata:
  name: with-pod-affinity
spec:
  affinity:
    podAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:

          - key: security

            operator: In

            values:

           - S1

        topologyKey: topology.kubernetes.io/zone

    podAntiAffinity:

      preferredDuringSchedulingIgnoredDuringExecution:

      - weight: 100

       podAffinityTerm:

          labelSelector:

            matchExpressions:

            - key: security

              operator: In

              values:

              - S2

          topologyKey: topology.kubernetes.io/zone

  containers:

  - name: with-pod-affinity

    image: registry.k8s.io/pause:2.0

Related[edit]

Activities[edit]

https://aws.amazon.com/about-aws/whats-new/2022/04/amazon-eks-karpenter-v0-9-0-pod-affinity/

See also[edit]

Kubernetes pod affinity and anti affinity, Kubernetes Node Affinity, default-scheduler, affinity:, NodeAffinity, spec.affinity.podAntiAffinity
Pods: kubectl apply, kubectl [ pod get | top | delete | describe pods ], InitContainers, PodInitializing, CrashLoopBackOff, ImagePullPolicy:, NodeAffinity, NodeSelector, Terminated
Karpenter, karpenter.sh, provisioners.karpenter.sh, Karpenter releases, best practices, karpenter.sh/capacity-type, karpenter.sh/discovery, kind: Provisioner, kind: AWSNodeTemplate, kubectl provisioner, TopologyKey, FailedDraining, Evict, DisruptionBlocked, Karpenter logs, controller., ttlSecondsUntilExpired, KEDA, NodePools, Kind: NodePool, Workload Consolidation, Disruption controls

@@ Line 1: / Line 1: @@
   https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/#affinity-and-anti-affinity
-* Elasticsearch [[PodAntiAffinity]] official example
+* Elasticsearch <code>[[PodAntiAffinity]]</code> official example
 /11 nodes are available: 1 [[Insufficient cpu]], 1 Too many pods, 10 nodes(s) didn't match Pod's node [[affinity]]/selector
-/2 nodes are available: 1 Too many pods, 1 nodes(s) didn't match Pod's node [[affinity]]/selector
+/2 nodes are available: 1 Too many pods, 1 nodes(s) [[didn't match Pod's node affinity/selector]]
+/24 nodes are available: 0/24 [[nodes are available]]: 1 node(s) [[didn't match pod anti-affinity rules]], 1 node(s) [[were unschedulable]], 2 node(s) [[had taint]] {[[node.kubernetes.io/not-ready]]}, that the pod did not tolerate, 20 node(s) [[didn't match Pod's node affinity/selector]].
+Too many pods, 1 nodes(s) [[didn't match Pod's node affinity/selector]]
 == Official examples ==
+ https://raw.githubusercontent.com/kubernetes/website/main/content/en/examples/pods/pod-with-node-affinity.yaml
   [[apiVersion]]: v1
   [[kind:]] [[Pod]]
   [[metadata]]:
     name: [[with-node-affinity]]
   spec:
+    [[affinity:]]
-    [[affinity]]:
       [[nodeAffinity]]:
         requiredDuringSchedulingIgnoredDuringExecution:
+         [[nodeSelectorTerms]]:
+         - [[matchExpressions]]:
+           - [[key:]] [[topology.kubernetes.io/zone]]
+             operator: In
+             values:
+             - antarctica-east1
+             - antarctica-west1
+       preferredDuringSchedulingIgnoredDuringExecution:
+       - weight: 1
+         [[preference:]]
+           [[matchExpressions]]:
+           - key: another-node-label-key
+             operator: In
+             [[values]]:
+             - another-node-label-value
+   [[containers]]:
+   - name: with-node-affinity
+     image: registry.k8s.io/pause:2.0
+ apiVersion: v1
+ kind: Pod
+ metadata:
+   name: with-pod-affinity
+ spec:
+   affinity:
+     podAffinity:
+       requiredDuringSchedulingIgnoredDuringExecution:
+       - labelSelector:
+           matchExpressions:
-         nodeSelectorTerms:
+            - key: security
-         - matchExpressions:
-            - key: topology.kubernetes.io/zone
               operator: In
@@ Line 35: / Line 57: @@
               values:
-             - antarctica-east1
+            - S1
+         topologyKey: topology.kubernetes.io/zone
-             - antarctica-west1
+     [[podAntiAffinity]]:
         preferredDuringSchedulingIgnoredDuringExecution:
-        - weight: 1
+        - weight: 100
+        podAffinityTerm:
+           labelSelector:
-         preference:
+             matchExpressions:
-           matchExpressions:
+             - key: [[security]]
-           - key: another-node-label-key
+               operator: In
-             operator: In
+               values:
-             values:
+               - [[S2]]
-             - another-node-label-value
+           topologyKey: topology.kubernetes.io/zone
     containers:
-    - name: with-node-affinity
+    - name: with-pod-affinity
-      image: registry.k8s.io/pause:2.0
+      [[image]]: registry.k8s.io/pause:2.0
-<pre>
-apiVersion: v1
-kind: Pod
-metadata:
-  name: with-pod-affinity
-spec:
-  affinity:
-    podAffinity:
-      requiredDuringSchedulingIgnoredDuringExecution:
-      - labelSelector:
-          matchExpressions:
-          - key: security
-            operator: In
-            values:
-            - S1
-        topologyKey: topology.kubernetes.io/zone
-    podAntiAffinity:
-      preferredDuringSchedulingIgnoredDuringExecution:
-      - weight: 100
-        podAffinityTerm:
-          labelSelector:
-            matchExpressions:
-            - key: security
-              operator: In
-              values:
-              - S2
-          topologyKey: topology.kubernetes.io/zone
-  containers:
-  - name: with-pod-affinity
-    image: registry.k8s.io/pause:2.0
-</pre>
 == Related ==
 * [[Kubernetes Pod Topology Spread Constraints]]
- [[default-scheduler]]
+* <code>[[default-scheduler]]</code>
+* [[Volume node affinity conflict]]
+* [[taints]], [[Node taints]]
+* [[spec.NodeSelector]]
+== Activities ==
+* https://aws.amazon.com/about-aws/whats-new/2022/04/amazon-eks-karpenter-v0-9-0-pod-affinity/
 == See also ==
+* {{K8s affinity}}
 * {{K8s pods}}
+* {{Karpenter}}
 [[Category:K8s]]

Difference between revisions of "Kubernetes pod affinity and anti affinity"

Latest revision as of 07:23, 25 July 2024

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Activities[edit]

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