CentOS 7.9 Availability Verification Kubernetes-1.25.2 Cluste

一、CentOS 7.9 Availability Verification Kubernetes-1.25.2 Cluste

1 创建测试的资源清单

cat > /opt/kubernetes/yaml/busybox-test.yaml << EOF
apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - name: busybox
    image: busybox:1.28
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
  restartPolicy: Always
EOF

2 部署 busybox

kubectl apply -f  /opt/kubernetes/yaml/busybox-test.yaml

​

3 测试域名解析功能

kubectl exec busybox -n default -- nslookup kubernetes
kubectl exec busybox -n default -- nslookup kube-dns.kube-system
kubectl exec -it busybox -- sh

telnet 10.96.0.1

二、集群验证

1 使用nginx进行测试集群验证

cat > /opt/kubernetes/yaml/nginx-test.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name:  nginx-kube
  namespace: default
  labels:
    app:  nginx-kube
spec:
  selector:
    matchLabels:
      app: nginx-kube
  replicas: 2
  template:
    metadata:
      labels:
        app:  nginx-kube
    spec:
      containers:
      - name:  nginx-kube
        image:  nginx
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
  namespace: default
spec:
  selector:
    app:  nginx-kube
  type: ClusterIP
  ports:
  - name: nginx-svc
    port: 80
    targetPort: 80
    protocol: TCP
---
apiVersion: v1
kind: Namespace
metadata:
  name: iyuyixyz
spec: {}
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name:  nginx-xyz
  namespace: iyuyixyz
  labels:
    app: nginx-xyz
spec:
  selector:
    matchLabels:
      app: nginx-xyz
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx-xyz
    spec:
      containers:
      - name: nginx-xyz
        image: nginx
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-svc-xyz
  namespace: iyuyixyz
spec:
  selector:
    app:  nginx-xyz
  type: ClusterIP
  ports:
  - name: nginx-svc-xyz
    port: 80
    targetPort: 80
    protocol: TCP
EOF

2 安装

[root@kube-master01 ~]# kubectl apply -f /opt/kubernetes/yaml/nginx-test.yaml
deployment.apps/nginx-kube created
service/nginx-svc created
namespace/iyuyixyz created
deployment.apps/nginx-xyz created
service/nginx-svc-xyz created

2 查看详情

kubectl get cs,csr,node,svc,pod -A -o wide

3 在node节点访问nginx

验证Pod网络可访问性，同名称空间，不同名称空间可以使用 Pod IP 互相访问。

curl IP

4 验证Service网络可访问性，集群机器使用Service IP 可以负载均衡访问。

5 进入容器Pod内部，使用default的Pod IP访问nginx，使用default的Service IP访问nginx。

kubectl exec -it ... -n iyuyixyz -- bash

6 进入default的Pod容器内，访问跨名称空间的 Service，进行访问。Service域名：servicename.namespace

kubectl exec -it ... -n iyuyixyz -- bash

三、安装 Kubernetes-1.25.2

Installing Kubernetes-1.25.2 on CentOS 7.9：Installing Kubernetes-1.25.2 on CentOS 7.9