Kubernetes 之 Deployment

千度20162024-05-26 23:47

Kubernetes 之 Deployment

Deployment 定义

Deployment 是 Kubernetes 中最常用资源之一，为 ReplicaSet 和 Pod 的创建提供了一种声明式的定义方法。Kubernetes 通过定义一个Deployment 控制器会创建一个新的 ReplicaSet 资源，通过 ReplicaSet 资源创建对应 Pod 的副本数。同时，如果我们删除 Deployment 控制器，也会删除 Deployment 控制器下对应的 ReplicaSet 控制器和 Pod 副本，这也是声明式定义的一个特点。

Deployment 常规使用

yaml 复制代码

apiVersion: apps/v1
kind: Deployment
metadata:
  name: deployment-nginx
  namespace: default
  labels:
    app: deployment-nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      app: pod-nginx
  template:
    metadata:
      labels:
        app: pod-nginx
    spec:
      containers:
        - name: nginx
          image: docker.io/k8s-test:v1.0
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80

复制代码

root@k8s-master1:~# kubectl get pods -owide
NAME                                READY   STATUS    RESTARTS   AGE   IP               NODE          NOMINATED NODE   READINESS GATES
deployment-nginx-6977747dd9-rv2mx   1/1     Running   0          8s    10.244.194.122   k8s-worker1   <none>           <none>
deployment-nginx-6977747dd9-sz42q   1/1     Running   0          8s    10.244.126.23    k8s-worker2   <none>           <none>
root@k8s-master1:~# kubectl get rs
NAME                          DESIRED   CURRENT   READY   AGE
deployment-nginx-6977747dd9   2         2         2       24s
root@k8s-master1:~# kubectl get deployment
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
deployment-nginx   2/2     2            2           41s