13、service
四层网络负载
创建
[root@k8s-master-node1 ~/yaml/test]#
[root@k8s-master-node1 ~/yaml/test]# vim my-app.yaml
[root@k8s-master-node1 ~/yaml/test]# cat my-app.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: my-dep
name: my-dep
spec:
replicas: 3
selector:
matchLabels:
app: my-dep
template:
metadata:
labels:
app: my-dep
spec:
containers:
- image: nginx
name: nginx
[root@k8s-master-node1 ~/yaml/test]# kubectl apply -f my-app.yaml
deployment.apps/my-dep created
[root@k8s-master-node1 ~/yaml/test]#
[root@k8s-master-node1 ~/yaml/test]# kubectl get deployments.apps
NAME READY UP-TO-DATE AVAILABLE AGE
ingress-demo-app 2/2 2 2 155m
my-dep 3/3 3 3 71s
nfs-client-provisioner 1/1 1 1 140m
[root@k8s-master-node1 ~/yaml/test]#
使用标签查找
[root@k8s-master-node1 ~/yaml/test]# kubectl get pod --show-labels
NAME READY STATUS RESTARTS AGE LABELS
hello-27285682--1-q2p6x 0/1 Completed 0 3m15s controller-uid=5e700c2e-29b3-4099-be17-b005d8077284,job-name=hello-27285682
hello-27285683--1-b2qgn 0/1 Completed 0 2m15s controller-uid=d7455e28-bd37-4fdf-bf47-de7ae6b4b7bb,job-name=hello-27285683
hello-27285684--1-glsmp 0/1 Completed 0 75s controller-uid=9cc7f28d-e780-49fb-a23a-ab725413ea8a,job-name=hello-27285684
hello-27285685--1-s7ws5 0/1 ContainerCreating 0 15s controller-uid=169e3631-6981-4df8-bfee-6a4f4632b713,job-name=hello-27285685
ingress-demo-app-694bf5d965-8rh7f 1/1 Running 0 157m app=ingress-demo-app,pod-template-hash=694bf5d965
ingress-demo-app-694bf5d965-swkpb 1/1 Running 0 157m app=ingress-demo-app,pod-template-hash=694bf5d965
my-dep-5b7868d854-kzflw 1/1 Running 0 2m34s app=my-dep,pod-template-hash=5b7868d854
my-dep-5b7868d854-pfhps 1/1 Running 0 2m34s app=my-dep,pod-template-hash=5b7868d854
my-dep-5b7868d854-v67ll 1/1 Running 0 2m34s app=my-dep,pod-template-hash=5b7868d854
nfs-client-provisioner-dc5789f74-5bznq 1/1 Running 0 141m app=nfs-client-provisioner,pod-template-hash=dc5789f74
pi--1-k5cbq 0/1 Completed 0 25m controller-uid=2ecfcafd-f848-403b-b37f-9c145a0dc8cc,job-name=pi
redis-app-86g4q 1/1 Running 0 27m controller-revision-hash=77c8899f5d,name=fluentd-redis,pod-template-generation=1
redis-app-rt92n 1/1 Running 0 27m controller-revision-hash=77c8899f5d,name=fluentd-redis,pod-template-generation=1
redis-app-vkzft 1/1 Running 0 27m controller-revision-hash=77c8899f5d,name=fluentd-redis,pod-template-generation=1
web-0 1/1 Running 0 91m app=nginx,controller-revision-hash=web-57c5cc66df,statefulset.kubernetes.io/pod-name=web-0
web-1 1/1 Running 0 91m app=nginx,controller-revision-hash=web-57c5cc66df,statefulset.kubernetes.io/pod-name=web-1
web-2 1/1 Running 0 90m app=nginx,controller-revision-hash=web-57c5cc66df,statefulset.kubernetes.io/pod-name=web-2
[root@k8s-master-node1 ~/yaml/test]#
[root@k8s-master-node1 ~/yaml/test]#
[root@k8s-master-node1 ~/yaml/test]#
[root@k8s-master-node1 ~/yaml/test]# kubectl get pod -l app=my-dep
NAME READY STATUS RESTARTS AGE
my-dep-5b7868d854-kzflw 1/1 Running 0 2m42s
my-dep-5b7868d854-pfhps 1/1 Running 0 2m42s
my-dep-5b7868d854-v67ll 1/1 Running 0 2m42s
[root@k8s-master-node1 ~/yaml/test]#
命令行暴露端口
[root@k8s-master-node1 ~/yaml/test]# kubectl expose deployment my-dep --port=8000 --target-port=80
service/my-dep exposed
[root@k8s-master-node1 ~/yaml/test]#
[root@k8s-master-node1 ~/yaml/test]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-demo-app ClusterIP 10.96.145.40 <none> 80/TCP 158m
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 160m
my-dep ClusterIP 10.96.241.162 <none> 8000/TCP 11s
nginx ClusterIP None <none> 80/TCP 92m
[root@k8s-master-node1 ~/yaml/test]#
yaml文件暴露端口
apiVersion: v1
kind: Service
metadata:
labels:
app: my-dep
name: my-dep
spec:
selector:
app: my-dep
ports:
- port: 8000
protocol: TCP
targetPort: 80
- yaml方式
apiVersion: v1
kind: Service
metadata:
labels:
app: my-dep
name: my-dep
spec:
ports:
- port: 8000
protocol: TCP
targetPort: 80
selector:
app: my-dep
type: ClusterIP
访问测试
[root@k8s-master-node1 ~/yaml/test]# curl -I 10.96.241.162:8000
HTTP/1.1 200 OK
Server: nginx/1.21.4
Date: Wed, 17 Nov 2021 09:30:27 GMT
Content-Type: text/html
Content-Length: 615
Last-Modified: Tue, 02 Nov 2021 14:49:22 GMT
Connection: keep-alive
ETag: "61814ff2-267"
Accept-Ranges: bytes
[root@k8s-master-node1 ~/yaml/test]#
NodePort方式暴露
命令行
kubectl expose deployment my-dep --port=8000 --target-port=80 --type=NodePort
yaml方式
apiVersion: v1
kind: Service
metadata:
labels:
app: my-dep
name: my-dep
spec:
ports:
- port: 8000
protocol: TCP
targetPort: 80
selector:
app: my-dep
type: NodePort
查看service
[root@k8s-master-node1 ~/yaml/test]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-demo-app ClusterIP 10.96.145.40 <none> 80/TCP 165m
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 167m
my-dep NodePort 10.96.241.162 <none> 8000:32306/TCP 7m13s
nginx ClusterIP None <none> 80/TCP 99m
[root@k8s-master-node1 ~/yaml/test]#
访问测试
使用kubernetes任何node的ip都可以访问
[root@k8s-master-node1 ~/yaml/test]# curl -I 192.168.1.62:32306
HTTP/1.1 200 OK
Server: nginx/1.21.4
Date: Wed, 17 Nov 2021 09:36:50 GMT
Content-Type: text/html
Content-Length: 615
Last-Modified: Tue, 02 Nov 2021 14:49:22 GMT
Connection: keep-alive
ETag: "61814ff2-267"
Accept-Ranges: bytes
[root@k8s-master-node1 ~/yaml/test]# curl -I 192.168.1.61:32306
HTTP/1.1 200 OK
Server: nginx/1.21.4
Date: Wed, 17 Nov 2021 09:36:53 GMT
Content-Type: text/html
Content-Length: 615
Last-Modified: Tue, 02 Nov 2021 14:49:22 GMT
Connection: keep-alive
ETag: "61814ff2-267"
Accept-Ranges: bytes
[root@k8s-master-node1 ~/yaml/test]# curl -I 192.168.1.63:32306
HTTP/1.1 200 OK
Server: nginx/1.21.4
Date: Wed, 17 Nov 2021 09:36:56 GMT
Content-Type: text/html
Content-Length: 615
Last-Modified: Tue, 02 Nov 2021 14:49:22 GMT
Connection: keep-alive
ETag: "61814ff2-267"
Accept-Ranges: bytes
[root@k8s-master-node1 ~/yaml/test]#
https://www.zhihu.com/people/chen-bu-yun-2
https://space.bilibili.com/352476552/article
https://cloud.tencent.com/developer/column/93230
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