k8s nodeSelector和affinity_core.volumenodeaffinity{required:(*core.nodeselect-优快云博客

这篇博客详细介绍了 Kubernetes 中的节点亲和性和 Pod 亲和性的配置方法，包括如何设置 `nodeSelector` 和 `podAffinity`，以及如何指定 `In` 操作符来选择特定节点，和使用 `weight` 来设置优先级。此外，还展示了如何实现 Pod 的负亲和性，以确保某些 Pod 不在同一节点上运行。

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apiVersion: v1
kind: Pod
metadata:
  name: with-node-affinity
  annotations:
    scheduler.alpha.kubernetes.io/affinity: >
      {
        "nodeAffinity": {
          "requiredDuringSchedulingIgnoredDuringExecution": {
            "nodeSelectorTerms": [
              {
                "matchExpressions": [
                  {
                    "key": "kubernetes.io/hostname",
                    "operator": "In",
                    "values": [“mesos-slave1″,”mesos-slave2”]
                  }
                ]
              }
            ]
          }
        }
      }
    another-annotation-key: another-annotation-value
spec:
  containers:
  - name: with-node-affinity
    image: gcr.io/google_containers/pause:2.0

apiVersion: v1
kind: Pod
metadata:
  name: with-labels
  annotations:
    scheduler.alpha.kubernetes.io/affinity: >
    {
       "nodeAffinity": {
          "preferredDuringSchedulingIgnoredDuringExecution": [
                {
                    "weight" : 1,
                    "preference": {
                        "matchExpressions": [
                            {
                                "key": "disktype",
                                "operator": "In",
                                "values": ["ssd"]
                            }
                        ]
                    }
                }
            ]
        }
    }
    another-annotation-key: another-annotation-value
spec:
  containers:
  - name: test-affinity
    env:
      - name: MYSQL_ROOT_PASSWORD
        value: pass
    image: mysql

 affinity:
   nodeAffinity:
     requiredDuringSchedulingIgnoredDuringExecution:
       nodeSelectorTerms:
       - matchExpressions:
         - key: error
           operator: DoesNotExist

apiVersion: v1
kind: Pod
metadata:
  name: with-pod-affinity
  annotations:
    scheduler.alpha.kubernetes.io/affinity: >
        {
          "podAffinity": {
            "requiredDuringSchedulingIgnoredDuringExecution": [
              {
                "labelSelector": {
                  "matchExpressions": [
                    {
                      "key": "security",
                      "operator": "In",
                      "values": ["S1"]
                    }
                  ]
                },
                "topologyKey": "failure-domain.beta.kubernetes.io/zone"
             }
            ]
           },
          "podAntiAffinity": {
            "requiredDuringSchedulingIgnoredDuringExecution": [
              {
                "labelSelector": {
                  "matchExpressions": [
                    {
                      "key": "security",
                      "operator": "In",
                      "values": ["S2"]
                    }
                  ]
                },
                "topologyKey": "kubernetes.io/hostname"
             }
            ]
           }
         }
spec:
  containers:
  - name: with-pod-affinity
    image: gcr.io/google_containers/pause:2.0