k8s使用ingress-nginx负载均衡的示例分析

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ingress-nginx负载均衡调用顺序:用户--->ingress-nginx(pod)--->ingress-nginx(控制器)--->ingress--->service--->pod

1.下载安装ingress-nginx(七层调度器)

https://kubernetes.github.io/ingress-nginx/deploy/ --详细文档

https://github.com/kubernetes/ingress-nginx/tree/master/deploy --ingress-nginx的yaml文件

[root@k8s1 ~]# kubectl explain ingress --帮助信息

[root@k8s1 ~]# vim /etc/sysconfig/kubelet --启用ipvs功能(service负载均衡有三种userspace,iptables,ipvs)

KUBE_PROXY_MODE=ipvs --添加参数

[root@k8s1 ~]# kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/mandatory.yaml

[root@k8s1 ~]# kubectl get pods -n ingress-nginx

NAME READY STATUS RESTARTS AGE

nginx-ingress-controller-68db76b4db-pqcl7 0/1 ContainerCreating 0 35s

[root@k8s1 ~]# kubectl get pods -n ingress-nginx

NAME READY STATUS RESTARTS AGE

nginx-ingress-controller-68db76b4db-pqcl7 1/1 Running 0 9m20s

[root@k8s1 ~]#

2.创建service控制器和后端三个pod

[root@k8s1 ~]# vim service-pod.yaml

kind: Service

metadata:

namespace: ingress-nginx

spec:

selector:

app: ingress-nginx --与下面的pod保持一至

release: canary

ports:

- name: http

targetPort: 80

port: 80

---

apiVersion: apps/v1

kind: Deployment

metadata:

namespace: ingress-nginx

spec:

replicas: 3

selector:

matchLabels:

app: ingress-nginx --与上面的service保持一至

release: canary

template:

metadata:

labels:

app: ingress-nginx --与上面的service保持一至

release: canary

spec:

containers:

- name: ingress-nginx --与上面的service保持一至

image: ikubernetes/myapp:v1

ports:

- name: http

containerPort: 80

[root@k8s1 ~]# kubectl apply -f service-pod.yaml

service/ingress-nginx created

deployment.apps/myapp-deploy-ng created

[root@k8s1 ~]# kubectl get pods -o wide -n ingress-nginx

NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES

myapp-deploy-ng-65d64df569-5f9l2 1/1 Running 0 9m6s 10.244.2.9 k8s3

myapp-deploy-ng-65d64df569-n288f 1/1 Running 0 9m6s 10.244.1.76 k8s2

myapp-deploy-ng-65d64df569-vnrj5 1/1 Running 0 9m6s 10.244.1.77 k8s2

nginx-ingress-controller-68db76b4db-d2h75 1/1 Running 0 18d 10.244.2.240 k8s3

[root@k8s1 ~]# kubectl get svc -n ingress-nginx

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE

ingress-nginx ClusterIP 10.99.27.16 80/TCP 20s

3.创建service-nodeport

[root@k8s1 ~]# wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/provider/baremetal/service-nodeport.yaml

[root@k8s1 ~]# vim service-nodeport.yaml

apiVersion: v1

kind: Service

metadata:

namespace: ingress-nginx

spec:

type: NodePort

ports:

- name: http

port: 80

targetPort: 80

protocol: TCP

nodePort: 30880

- name: https

port: 443

targetPort: 443

protocol: TCP

nodePort: 30443

selector:

app: ingress-nginx

[root@k8s1 ~]# kubectl apply -f service-nodeport.yaml

service/ingress-nginx configured

[root@k8s1 ~]# kubectl get svc -n ingress-nginx

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE

ingress-nginx NodePort 10.99.27.16 80:30880/TCP,443:30443/TCP 11h

[root@k8s1 ~]# kubectl describe svc ingress-nginx -n ingress-nginx

Name: ingress-nginx

Namespace: ingress-nginx

Labels:

Annotations: kubectl.kubernetes.io/last-applied-configuration:

{"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"name":"ingress-nginx","namespace":"ingress-nginx"},"spec":{"ports":[{"na...

Selector: app=ingress-nginx

Type: NodePort

IP: 10.99.27.16

Port: http 80/TCP

TargetPort: 80/TCP

NodePort: http 30880/TCP

Endpoints: 10.244.1.76:80,10.244.1.77:80,10.244.2.9:80 --后端代理的三个pod地址

Port: https 443/TCP

TargetPort: 443/TCP

NodePort: https 30443/TCP

Endpoints: 10.244.1.76:443,10.244.1.77:443,10.244.2.9:443

Session Affinity: None

External Traffic Policy: Cluster

Events:

[root@k8s1 ~]# curl http://172.16.8.12:30880

4.创建ingress控制器

[root@k8s1 ~]# cat ingress.yaml

apiVersion: extensions/v1beta1

kind: Ingress

metadata:

namespace: default

annotations:

kubernetes.io/ingress.class: "nginx"

spec:

rules:

- host: myapp.magedu.com --域名

http:

paths:

- path:

backend:

serviceName: ingress-nginx --service名字

servicePort: 80

[root@k8s1 ~]# kubectl apply -f ingress.yaml

ingress.extensions/ingress-myapp created

[root@k8s1 ~]# kubectl get ingress

NAME HOSTS ADDRESS PORTS AGE

ingress-myapp myapp.magedu.com 80 4s

[root@k8s1 ~]# kubectl describe ingress ingress-myapp --查看ingress-myapp详细信息

[root@k8s1 ~]# kubectl get pods -n ingress-nginx

NAME READY STATUS RESTARTS AGE

nginx-ingress-controller-68db76b4db-d2h75 1/1 Running 0 18d

[root@k8s1 ~]# kubectl exec -n ingress-nginx -it nginx-ingress-controller-68db76b4db-d2h75 -- /bin/sh

5.访问web站点

[root@k8s1 ~]# curl http://172.16.8.12:30880/hostname.html --返回的结果就是三个pod的主机名

myapp-deploy-ng-65d64df569-5f9l2

[root@k8s1 ~]# curl http://172.16.8.12:30880/hostname.html

myapp-deploy-ng-65d64df569-5f9l2

[root@k8s1 ~]# curl http://172.16.8.12:30880/hostname.html

myapp-deploy-ng-65d64df569-vnrj5

[root@k8s1 ~]# curl http://172.16.8.12:30880/hostname.html

myapp-deploy-ng-65d64df569-vnrj5

[root@k8s1 ~]# curl http://172.16.8.12:30880/hostname.html

myapp-deploy-ng-65d64df569-n288f

[root@k8s1 ~]#

以上就是k8s使用ingress-nginx负载均衡的示例分析，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。

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k8s使用ingress-nginx负载均衡的示例分析

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