添加标签到节点

  1. kubectl label nodes <node-name> <label-key>=<label-value>

添加节点选择器

  1. apiversion: app/v1
  2. kind: pod
  3. metadata:
  4.   name: nginx
  5.   label:
  6.     env: test
  7. spec:
  8.   containers:
  9.   - name: nginx
  10.     image: nginx 
  11.     imagePullPolicy: IfNotPresent
  12.   nodeSelector:
  13.     disktype: ssd

节点间的亲和性

亲和性 ： affinity 

  1. apiversion: app/v1
  2. kind: pod
  3. metadata:
  4.   name: nginx 
  5.   label:
  6.     env: test
  7. spec:
  8.   containers:
  9.   - name: nginx 
  10.     image: nginx
  11.     imagePullPolicy: IfNotPresent
  12.   affinity:
  13.     nodeAffinity:
  14.       reuiqredDuringSchedulingIgnoreDuringExecution:
  15.         nodeSelectorTerms:
  16.         - matchExpressions:
  17.           - key: key
  18.             operator: In
  19.             values:
  20.             - val1
  21.             - val2
  22.       preferredDuringSchedulingIgnoredDuringExecution:
  23.         - weight: 1  # 权重评分，通过遍历所有的节点计算总分，总分最高获胜
  24.         preference:
  25.           matchExpressions:
  26.           - key: another-node-label-key
  27.             operator: In
  28.             values:
  29.             - another-node-label-value
  • In：label 的值在某个列表中
  • NotIn：label 的值不在某个列表中
  • Gt：label 的值大于某个值
  • Lt：label 的值小于某个值
  • Exists：某个 label 存在
  • DoesNotExist：某个 label 不存在

    pod 间的亲和性和反亲和性

    1. apiVersion: v1
    2. kind: Pod
    3. metadata:
    4. name: with-pod-affinity
    5. labels:
    6.   app: pod-affinity-pod
    7. spec:
    8. containers:
    9. - name: with-pod-affinity
    10.   image: nginx
    11. affinity:
    12.   podAffinity:
    13.     requiredDuringSchedulingIgnoredDuringExecution:
    14.     - labelSelector:
    15.         matchExpressions:
    16.         - key: app
    17.           operator: In
    18.           values:
    19.           - busybox-pod
    20.       topologyKey: kubernetes.io/hostname
    21.   podAntiAffinity:
    22.     preferredDuringSchedulingIgnoredDuringExecution:
    23.     - weight: 1
    24.       podAffinityTerm:
    25.         labelSelector:
    26.           matchExpressions:
    27.           - key: app
    28.             operator: In
    29.             values:
    30.             - node-affinity-pod
    31.         topologyKey: kubernetes.io/hostname
    第一个 pod 最好调度某个指定的主机上，上面至少一个节点运行这样的 pod: app=busybox-pod
    第二个则是最好不要调度到这样的节点： app=node-affinity-pod