Azure Kubernetes - 每个节点只执行一个部署？

Question

我目前正在 Azure Kubernetes 中为生产环境创建一个 Kubernetes 集群。在我的集群中，节点池中有 2 个节点 - pool1。

现在，我想部署 2 个应用程序，但是这两个应用程序都将使用容器端口 5000，并且由于某些原因我将无法更改端口。

为简单起见，除了部署名称外，我为两个部署保留了相同的清单

部署清单 - 1:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment-1
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.16.1
        ports:
        - containerPort: 5000

部署清单 - 2:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment-2
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.16.1
        ports:
        - containerPort: 5000

由于两个部署使用相同的容器端口，因此第二次部署失败，因为它部署在部署第一个应用程序的同一节点上。

我想实施一项政策，在 Azure Kubernetes 中每个节点只允许一个部署（但不限制其他 pods，如代理、sidecar）。

最后应该是deployment-1到node-x，deployment-2到node-y，请指点。

Answer 1

你可以在你的情况下使用 nodeSelector:

nodeSelector is the simplest recommended form of node selection constraint. nodeSelector is a field of PodSpec. It specifies a map of key-value pairs. For the pod to be eligible to run on a node, the node must have each of the indicated key-value pairs as labels (it can have additional labels as well). The most common usage is one key-value pair.

nodeSelector是节点选择约束的一种形式。 nodeSelector 是 PodSpec 的一个字段。这是一个简单的 Pod 调度功能，允许将 Pod 调度到标签与用户指定的 nodeSelector 标签相匹配的节点上。

还有Affinity and anti-affinity as well as Inter-pod affinity and anti-affinity that you could consider using. Notice the More Practical Use-cases应该符合你的要求：

Interpod Affinity and AntiAffinity can be even more useful when they are used with higher level collections such as ReplicaSets, StatefulSets, Deployments, etc. One can easily configure that a set of workloads should be co-located in the same defined topology, eg., the same node.

您可以在链接的文档中找到更多详细信息和示例。

Azure Kubernetes - 每个节点只执行一个部署？

Azure Kubernetes - Enforce only one deployment per node?

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kubernetes

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