k8s 设置副本数

fanruitian2026-01-25 8:20

创建一个yml文件

nginx.yml

复制代码

apiVersion: apps/v1
kind: Deployment
metadata: 
  labels:
    app: mynginx
  name: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: mynginx
  template:
    metadata:
      labels:
        app: mynginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.25              
        imagePullPolicy: IfNotPresent

先pull image

docker pull nginx:1.25

由于docker镜像访问失败，可以提前load

minikube image load nginx:1.25

执行

复制代码

[admin@localhost k8s]$ kubectl apply -f  nginx.yaml
deployment.apps/nginx created
[admin@localhost k8s]$ kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-58fd4875cd-lj7rz   1/1     Running   0          6s
nginx-58fd4875cd-m9fch   1/1     Running   0          6s
nginx-58fd4875cd-w8f7t   1/1     Running   0          6s

查看成功！

设置一下扩容数

复制代码

[admin@localhost k8s]$ kubectl scale --replicas=5 deployment/nginx
deployment.apps/nginx scaled
[admin@localhost k8s]$ kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-58fd4875cd-4s5g6   1/1     Running   0          6s
nginx-58fd4875cd-lj7rz   1/1     Running   0          2m19s
nginx-58fd4875cd-m9fch   1/1     Running   0          2m19s
nginx-58fd4875cd-p62lv   1/1     Running   0          6s
nginx-58fd4875cd-w8f7t   1/1     Running   0          2m19s

删掉一个pod，由于是deployment级别创建的，会自动创建保持副本数

复制代码

[admin@localhost k8s]$ kubectl delete pod nginx-58fd4875cd-4s5g6
pod "nginx-58fd4875cd-4s5g6" deleted
[admin@localhost k8s]$ kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-58fd4875cd-9qfhl   1/1     Running   0          4s
nginx-58fd4875cd-lj7rz   1/1     Running   0          2m55s
nginx-58fd4875cd-m9fch   1/1     Running   0          2m55s
nginx-58fd4875cd-p62lv   1/1     Running   0          42s
nginx-58fd4875cd-w8f7t   1/1     Running   0          2m55s