1.网络请求测试
创建deploment控制器
kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=1
[root@k8s-master /]# kubectl get pod -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
client 1/1 Running 0 32m 10.244.2.11 k8s-node2 <none> <none>
nginx-deploy-66ff98548d-xvbw8 1/1 Running 0 18s 10.244.1.17 k8s-node1 <none> <none>
其中pod节点IP 属于节点的cni0桥网络 集群内的pod节点互相可以解析
创建service暴露nginx服务端口
kubectl expose deploy nginx-deploy --name=nginx --port=80 --target-port=80
[root@k8s-master /]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 13d
nginx ClusterIP 10.106.160.157 <none> 80/TCP 7s
CLUSTER-IP 集群IP可以被集群节点curl访问
nginx 服务可以被解析成集群ClusterIP
dig -t A nginx.default.svc.cluster.local @10.96.0.10
;; ANSWER SECTION:
nginx.default.svc.cluster.local. 30 IN A 10.106.160.157
创建一个pod客户端测试访问其他节点
kubectl run client --image=busybox --replicas=1 -it --restart=Never
/ # wget nginx
Connecting to nginx (10.106.160.157:80)
saving to 'index.html'
index.html 100% |******************************************************************************************************************************************| 612 0:00:00 ETA
'index.html' saved
pod节点可以访问其他pod节点服务并解析成对应的ClusterIP以及端口
通过service通过标签关联pod
[root@k8s-master /]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
client 1/1 Running 0 82m run=client
nginx-deploy-66ff98548d-xvbw8 1/1 Running 0 49m pod-template-hash=66ff98548d,run=nginx-deploy
[root@k8s-master /]# kubectl describe svc nginx
Name: nginx
Namespace: default
Labels: run=nginx-deploy
Annotations: <none>
Selector: run=nginx-deploy
Type: ClusterIP
IP: 10.106.160.157
Port: <unset> 80/TCP
TargetPort: 80/TCP
Endpoints: 10.244.1.17:80
Session Affinity: None
Events: <none>
2.启动一个简单的应用的命令
kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=1
kubectl expose deploy nginx-deploy --name=nginx --port=80 --target-port=80
kubectl run client --image=busybox --replicas=1 -it --restart=Never
kubectl get pod -w
kubectl set image deployment myapp myapp=ikubernetes/myapp:v2
kubectl scale --replicas=5 deployment myapp
kubectl rollout status deployment myapp
kubectl get pod pod_name -o yaml
kubectl edit deployment nginx-deploy
kubectl get pods --show-labels