参考文档：http://traefik.cn/
traefik和ingress的对比
ingress:
使用nginx作为前端负载均衡，通过ingress controller不断的和kubernetes api交互，实时获取后端service，pod等的变化，然后动态更新nginx配置，并刷新使配置生效，达到服务发现的目的。
traefik:
traefik本身设计的就能够实时跟kubernetes api交互，感知后端service，pod等的变化，自动更新配置并重载。
traefik更快速方便，同时支持更多的特性，使反向代理，负载均衡更直接更高效
helm部署traefik
代码语言：javascript复制下载traefik需要用到的chart
[root@k8s-master ~]# git clone https://github.com/helm/charts.git
修改traefik使用宿主机网络
[root@k8s-master ~]# vim charts/stable/traefik/templates/deployment.yaml
hostNetwork: true
配置dashboard
[root@k8s-master ~]# cd charts/stable/
[root@k8s-master stable]# vim traefik/traefik.yaml
serviceType: NodePort
replicas: 1
resources:
limits:
cpu: 500m
memory: 512Mi
dashboard:
enabled: true
domain: traefik.test.com
service:
nodePorts:
http: 30080
https: 30443
rbac:
enabled: true
metrics:
prometheus:
enabled: true
部署
[root@k8s-master stable]# helm install ./traefik --name traefik --namespace kube-system -f traefik/traefik.yaml
[root@k8s-master ~]# kubectl get pod -n kube-system -o wide |grep traefik
traefik-74df464495-w288l 0/1 Running 0 7s 192.168.0.123 k8s-node01 <none> <none>
[root@k8s-node01 ~]# netstat -tnlp |grep traefik
tcp6 0 0 :::8080 :::* LISTEN 110720/traefik
tcp6 0 0 :::8880 :::* LISTEN 110720/traefik
tcp6 0 0 :::80 :::* LISTEN 110720/traefi部署应用
代码语言：javascript复制[root@k8s-master demo]# cat deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp-backend-pod
namespace: default
spec:
replicas: 3
selector:
matchLabels:
app: myapp
release: canary
template:
metadata:
labels:
app: myapp
release: canary
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v2
ports:
- name: http
containerPort: 80
[root@k8s-master demo]# cat service.yaml
apiVersion: v1
kind: Service
metadata:
name: myapp
namespace: default
spec:
selector:
app: myapp
release: canary
ports:
- name: http
targetPort: 80
port: 80
[root@k8s-master demo]# kubectl apply -f .
deployment.apps/myapp-backend-pod created
service/myapp created
[root@k8s-master demo]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.1.0.1 <none> 443/TCP 46h
myapp ClusterIP 10.1.125.169 <none> 80/TCP 43s
[root@k8s-master demo]# curl 10.1.125.169
Hello MyApp | Version: v2 | <a href="hostname.html">Pod Name</a>配置ingress规则使集群外部访问
代码语言：javascript复制[root@k8s-master demo]# cat ingress.yaml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: hello-ingress
annotations:
kubernetes.io/ingress.class: traefik
spec:
rules:
- host: hello.test.com
http:
paths:
- path: /
backend:
serviceName: myapp
servicePort: 80
[root@k8s-master demo]# kubectl apply -f ingress.yaml
ingress.extensions/hello-ingress created
traefik的Dashboard
一个简单的Dashboard, 可以看当前的路由规则，和转发的结果统计。
