Select 其他 POD 不存在的节点

Question

我有两个节点

gke-1789571565414321321-a3ec9151-node-q0cz gke-98798532417432432421-a3ec9151-node-q0cz

我有两个要部署的 ReplicationController 2 pods, xxx & yyy.

我想要的：如果 xxx 部署在其中一个 node 上，yyy 应该部署到另一个。

我通过 spec.nodeName 属性.

实现了这个

是否有通用的方法来避免指示特定节点？

xxx:

{
  "apiVersion": "v1",
  "kind": "ReplicationController",
  "metadata": {
    "name": "xxx",
    "labels": { "name" : "xxx" }
  },
  "spec": {  
    "replicas": 1,
    "selector": {
      "name":"xxx"
    },
    "template": { 
      "metadata": {
        "labels": {
          "name":"xxx"
        }
      },
      "spec": { 
        "containers": [
          //...
        ],
        "nodeName" : "gke-1789571565414321321-a3ec9151-node-q0cz"
      }
    }
  }
}

yyy:

{
  "apiVersion": "v1",
  "kind": "ReplicationController",
  "metadata": {
    "name": "yyy",
    "labels": { "name" : "yyy" }
  },
  "spec": {  
    "replicas": 1,
    "selector": {
      "name":"yyy"
    },
    "template": { 
      "metadata": {
        "labels": {
          "name":"yyy"
        }
      },
      "spec": { 
        "containers": [
          //...
        ],
        "nodeName" : "gke-98798532417432432421-a3ec9151-node-q0cz"
      }
    }
  }
}

Answer 1

您正在寻找的功能称为 "anti-affinity"，尚未实现（但在 design doc in github). Until then, you can force the pods to be spread by assigning a constraint that can only be met once per node, such as a host port (see Allow only one pod of a type on a node in Kubernetes 中有描述）。

Select 其他 POD 不存在的节点

Select node where the other POD does not exist

kubernetes