---

layout: post
title: traefik 负载均衡
categories: docker
description: traefik 负载均衡

keywords: docker

Traefik 是一款开源的反向代理与负载均衡工具。它最大的优点是能够与常见的微服务系统直接整合，可以实现自动化动态配置。目前支持Docker, Swarm, Mesos/Marathon, Mesos, Kubernetes, Consul, Etcd, Zookeeper, BoltDB, Rest API等等后端模型

Traefik 简介

traefik 官网 https://docs.traefik.io/
github https://github.com/containous/traefik

traefik 与 kubernetes

1.1 kubernetes 环境

[root@k8s-node-1 ~]#kubectl get nodes  
NAME         STATUS         AGE  
k8s-node-1   Ready,master   5d  
k8s-node-2   Ready          5d  
k8s-node-3   Ready          5d  
  

1.2 下载 traefik-dm

# 定义 node-2 node-3 标签。  
  
kubectl label nodes k8s-node-2 role=traefik-lb  
kubectl label nodes k8s-node-3 role=traefik-lb  
  
# 查看此标签的 nodes  
  
[root@k8s-node-1 ~]#kubectl get nodes -l role=traefik-lb  
NAME         STATUS    AGE  
k8s-node-2   Ready     5d  
k8s-node-3   Ready     5d  
  
  
  
  
# 下载yaml 文件  
  
curl -O https://raw.githubusercontent.com/containous/traefik/master/examples/k8s/traefik.yaml  
		  
		  
# yaml 可修改 replicas = node 个数  
#      增加 restartPolicy: Always  
#	   修改 web ui 端口 containerPort: 8080 修改为 containerPort: 8888  
#	                    args: 下面增加 --web.address=:8888  
#	   增加 nodeSelector:  
#              role: traefik-lb  
			  
# 修改后的文件如下：  
  
apiVersion: v1  
kind: Deployment  
apiVersion: extensions/v1beta1  
metadata:  
  name: traefik-ingress-controller  
  namespace: kube-system  
  labels:  
    k8s-app: traefik-ingress-lb  
spec:  
  replicas: 2  
  selector:  
    matchLabels:  
      k8s-app: traefik-ingress-lb  
  template:  
    metadata:  
      labels:  
        k8s-app: traefik-ingress-lb  
        name: traefik-ingress-lb  
    spec:  
      terminationGracePeriodSeconds: 60  
      hostNetwork: true  
	  restartPolicy: Always  
      nodeSelector:  
        role: traefik-lb  
      containers:  
      - image: traefik  
        name: traefik-ingress-lb  
        resources:  
          limits:  
            cpu: 200m  
            memory: 30Mi  
          requests:  
            cpu: 100m  
            memory: 20Mi  
        ports:  
        - name: http  
          containerPort: 80  
          hostPort: 80  
        - name: admin  
          containerPort: 8888  
        args:  
        - --web  
        - --web.address=:8888  
        - --kubernetes  
  
		  
# 创建 traefik deployment  
  
[root@k8s-node-1 ~]#kubectl create -f traefik.yaml  
deployment "traefik-ingress-controller" created  
  
  
# 查看 deployment  
  
[root@k8s-node-1 ~]#kubectl get deploy --all-namespaces  
NAMESPACE     NAME                         DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE  
kube-system   traefik-ingress-controller   1         1         1            1           2m  
  

1.3 部署一个 nginx 应用

# 创建一个 nginx yaml 文件  
  
apiVersion: extensions/v1beta1  
kind: Deployment  
metadata:  
  name: nginx-dm  
spec:  
  replicas: 2  
  template:  
    metadata:  
      labels:  
        name: nginx  
    spec:  
      containers:  
        - name: nginx  
          image: nginx  
          imagePullPolicy: IfNotPresent  
          ports:  
            - containerPort: 80  
  
---  
apiVersion: v1  
kind: Service  
metadata:  
  name: nginx-dm  
spec:  
  ports:  
    - port: 80  
      targetPort: 80  
      protocol: TCP  
  selector:  
    name: nginx  
	  
  
# 创建 deploy 与 svc  
  
[root@k8s-node-1 ~]#kubectl create -f nginx.yaml  
  
  
  
# 查看 nginx-dm  
  
[root@k8s-node-1 ~]#kubectl get svc  
NAME         CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE  
kubernetes   10.96.0.1       <none>        443/TCP   5d  
nginx-dm     10.105.76.250   <none>        80/TCP    34m  
[root@k8s-node-1 ~]#kubectl get deployment  
NAME       DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE  
nginx-dm   2         2         2            2           35m  
	  

1.4 创建 traefik ingress

# 创建 traefik-ingress yaml 文件  
  
  
apiVersion: extensions/v1beta1  
kind: Ingress  
metadata:  
  name: traefik-ingress  
spec:  
  rules:  
  - host: traefik.test.jicki.me  
    http:  
      paths:  
      - path: /  
        backend:  
          serviceName: nginx-dm  
          servicePort: 80  
  
  
# 创建 ingress	  
[root@k8s-node-1 ~]#kubectl create -f traefik-ingress.yaml  
  
  
# 查看 ing  
  
[root@k8s-node-1 ~]#kubectl get ing  
NAME              HOSTS                   ADDRESS   PORTS     AGE  
traefik-ingress   traefik.test.jicki.me             80        32m	  
	  

1.5 创建 traefik web ui

# 下载 web ui yaml 文件  
  
curl -O https://raw.githubusercontent.com/containous/traefik/master/examples/k8s/ui.yaml  
  
[root@k8s-node-1 ~]#kubectl create -f ui.yaml  
  

1.6 访问 nginx 应用

[root@k8s-node-1 ~]#curl -I traefik.test.jicki.me  
HTTP/1.1 200 OK  
Accept-Ranges: bytes  
Content-Length: 612  
Content-Type: text/html  
Date: Mon, 26 Dec 2016 09:18:33 GMT  
Etag: "585011f4-264"  
Last-Modified: Tue, 13 Dec 2016 15:21:24 GMT  
Server: nginx/1.11.7  
  

1.7 访问 traefik web ui

http://10.6.0.187:8888  
http://10.6.0.188:8888  

1.8 心跳检测

Null