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本篇文章给大家分享的是有关 k8s 使用 ingress-nginx 负载均衡的示例分析，丸趣 TV 小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着丸趣 TV 小编一起来看看吧。
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:
name: ingress-nginx
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:
name: myapp-deploy-ng
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 none none
myapp-deploy-ng-65d64df569-n288f 1/1 Running 0 9m6s 10.244.1.76 k8s2 none none
myapp-deploy-ng-65d64df569-vnrj5 1/1 Running 0 9m6s 10.244.1.77 k8s2 none none
nginx-ingress-controller-68db76b4db-d2h75 1/1 Running 0 18d 10.244.2.240 k8s3 none none
[root@k8s1 ~]# kubectl get svc -n ingress-nginx
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ingress-nginx ClusterIP 10.99.27.16 none 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:
name: ingress-nginx
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 none 80:30880/TCP,443:30443/TCP 11h
[root@k8s1 ~]# kubectl describe svc ingress-nginx -n ingress-nginx
Name: ingress-nginx
Namespace: ingress-nginx
Labels: none
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: none
[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:
name: ingress-myapp
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，丸趣 TV 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。更多详情敬请关注丸趣 TV 行业资讯频道。
