k8s pod节点亲和性nodeAffintiy

1. pod节点亲和性nodeAffintiy

• nodeAffinity：节点亲和性，与nodeSelector作用一样，但相比更灵活，满足更多条件，诸如：

  • 匹配有更多的逻辑组合，不只是字符串的完全相等

  • 调度分为软策略和硬策略，而不是硬性要求

    • 硬（required）：必须满足

    • 软（preferred）：尝试满足，但不保证

• 操作符：In、NotIn、Exists、DoesNotExist、Gt、Lt

• 示例：
  

  • 代码：

    apiVersion: v1
    kind: Pod
    metadata:
      name: with-node-affinity
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: gpu
                operator: In
                values:
                - nvidia-tesla
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: group
            operator: In
            values:
            - ai
      containers:
      - name: web
        image: nginx