K8s服务入口管理Traefik的安装使用和自动熔断

ゝ一纸荒年。 2022-11-27 01:53 156阅读 0赞

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前面部署了kubernetes/ingress-nginx 做为 Ingress Controller，使用 Nginx 反向代理与负载，经过 Ingress Controller 不断的跟 Kubernetes API 交互，实时获取后端 Service、Pod 等的变化，而后动态更新 Nginx 配置，并刷新使配置生效。Traefik 是一个用 Golang 开发的轻量级的 Http 反向代理和负载均衡器软件，因为能够自动化配置和刷新 backend 节点，目前能够被绝大部分容器平台与组件支持，例如 Docker, Swarm mode, Kubernetes,,Consul, Etcd, Rancher, Eureka 等。Traefik 设计的就可以实时跟 Kubernetes API 交互，感知后端 Service、Pod 等的变化，自动更新配置并热重载，使用上大致上差很少，可是 Traefik 更快速更方便，同时支持更多的特性，使反向代理、负载均衡更直接，更高效。node

**Traefik 特性** nginx

*  自动化动态配置无需服务重启
 *  支持多个负载平衡算法
 *  支持 Let’s Encrypt (通配符支持) 向您的微服务提供 HTTPS
 *  支持熔断，重试
 *  集群模式的高可用性
 *  提供简洁的 UI 界面
 *  支持 Websocket, HTTP/2, GRPC 协议
 *  提供监控的服务(Rest、Prometheus、Datadog、Statsd、InfluxDB)
 *  保留访问日志（JSON，CLF）
 *  快速
 *  支持 Rest API
 *  使用二进制文件打包，并做为一个 docker 镜像提供

# 部署 Traefik #

全部的配置文件能够在官方的 github 仓库中找到,按照官方文档来便可。git

**Role Based Access Control configuration (Kubernetes 1.6+ only)** github

---
    kind: ClusterRole
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
      name: traefik-ingress-controller
    rules:
      - apiGroups:
          - ""
        resources:
          - services
          - endpoints
          - secrets
        verbs:
          - get
          - list
          - watch
      - apiGroups:
          - extensions
        resources:
          - ingresses
        verbs:
          - get
          - list
          - watch
    ---
    kind: ClusterRoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
      name: traefik-ingress-controller
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: traefik-ingress-controller
    subjects:
    - kind: ServiceAccount
      name: traefik-ingress-controller
      namespace: kube-system

$ kubectl apply -f https://raw.githubusercontent.com/containous/traefik/master/examples/k8s/traefik-rbac.yaml

**Deploy Traefik using a Deployment or DaemonSet**web

DaemonSet 会在每台 Node 节点上都建立 Pod 而 Deployment  是人为控制的副本数量（根据实际需求来取决），这里使用 DaemonSet 类型来部署 Traefik。算法

**部署 Traefik（修改 hostNetwork: true）** docker

#https://raw.githubusercontent.com/containous/traefik/master/examples/k8s/traefik-ds.yamlvi traefik-ds.yaml
    
    vi traefik-ds.yaml
    
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: traefik-ingress-controller
      namespace: kube-system
    ---
    kind: DaemonSet
    apiVersion: extensions/v1beta1
    metadata:
      name: traefik-ingress-controller
      namespace: kube-system
      labels:
        k8s-app: traefik-ingress-lb
    spec:
      template:
        metadata:
          labels:
            k8s-app: traefik-ingress-lb
            name: traefik-ingress-lb
        spec:
          serviceAccountName: traefik-ingress-controller
          terminationGracePeriodSeconds: 60
          hostNetwork: true
          restartPolicy: Always
          containers:
          - image: traefik
            name: traefik-ingress-lb
            ports:
            - name: http
              containerPort: 80
              hostPort: 80
            - name: admin
              containerPort: 8080
              hostPort: 8080
            securityContext:
              capabilities:
                drop:
                - ALL
                add:
                - NET_BIND_SERVICE
            args:
            - --api
            - --kubernetes
            - --logLevel=INFO
    ---
    kind: Service
    apiVersion: v1
    metadata:
      name: traefik-ingress-service
      namespace: kube-system
    spec:
      selector:
        k8s-app: traefik-ingress-lb
      ports:
        - protocol: TCP
          port: 80
          name: web
        - protocol: TCP
          port: 8080
          name: admin

部署查看
    $ kubectl apply -f traefik-ds.yaml
    serviceaccount/traefik-ingress-controller unchanged
    daemonset.extensions/traefik-ingress-controller configured
    service/traefik-ingress-service unchanged
    $ kubectl apply -f traefik-ds.yaml
    serviceaccount/traefik-ingress-controller unchanged
    daemonset.extensions/traefik-ingress-controller unchanged
    service/traefik-ingress-service unchanged
    [root@kubernetes-master k8s]# kubectl -n kube-system get pod -o wide
    NAME                                        READY   STATUS    RESTARTS   AGE   IP              NODE                NOMINATED NODE
    traefik-ingress-controller-6fk9n            1/1     Running   0          41m   10.38.0.0       kubernetes-node-2   <none>
    traefik-ingress-controller-f7kmc            1/1     Running   0          41m   10.40.0.1       kubernetes-node-1   <none>

**备注：**上述因为修改 hostNetwork: true ，其实已经在每一个 Node 节点开放了 80 与 8080 端口，80 提供正常服务，8080 是其自带的 UI 界面。后端

**Node 节点查看开放的端口** api

$  netstat -ntlp
    Active Internet connections (only servers)
    Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
    tcp6       0      0 :::8080                 :::*                    LISTEN      10253/traefik
    tcp6       0      0 :::80                   :::*                    LISTEN      10253/traefik

**Ingress 方式暴露 Traefik Web UI** app

#  https://raw.githubusercontent.com/containous/traefik/master/examples/k8s/ui.yaml
    vi traefik-web-ui.yaml
    
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: traefik-web-ui
      namespace: kube-system
    spec:
      selector:
        k8s-app: traefik-ingress-lb
      ports:
      - name: web
        port: 80
        targetPort: 8080
    ---
    apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: traefik-web-ui
      namespace: kube-system
      annotations:
        kubernetes.io/ingress.class: traefik
    spec:
      rules:
      - host: traefik-ui.com
        http:
          paths:
          - backend:
              serviceName: traefik-web-ui
              servicePort: 80

部署查看

$ kubectl apply -f traefik-web-ui.yaml
    service/traefik-web-ui created
    ingress.extensions/traefik-web-ui created
    $ kubectl get ingress -o wide --all-namespaces
    NAMESPACE     NAME             HOSTS            ADDRESS   PORTS   AGE
    kube-system   traefik-web-ui   traefik-ui.com             80      18s

配置Host文件

172.23.216.49 k8s.dashboard.com
    172.23.216.49 traefik-ui.com

访问 http://traefik-ui.com/dashboard/ 经过 80 端口转发。

![image][]

# 模拟部署一个程序 #

下面模拟部署一个程序，已 Nginx  为例：

vi nginx-deployment.yaml
    
    apiVersion: v1
    kind: Service
    metadata:
      name: nginx-svc
    spec:
      template:
        metadata:
          labels:
            name: nginx-svc
            namespace: default
    spec:
      selector:
        run: nginx-pod
      ports:
      - protocol: TCP
        port: 80
        targetPort: 80
    ---
    apiVersion: apps/v1beta1
    kind: Deployment
    metadata:
      name: nginx-pod
    spec:
      replicas: 4
      template:
        metadata:
          labels:
            run: nginx-pod
        spec:
          containers:
          - name: nginx
            image: nginx:1.15.5
            ports:
            - containerPort: 80
    ---
    apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: ngx-ing
      annotations:
        kubernetes.io/ingress.class: traefik
    spec:
      rules:
      - host: k8s.nginx.com
        http:
          paths:
          - backend:
              serviceName: nginx-svc
              servicePort: 80

部署查看

$ kubectl apply -f nginx-deployment.yam
    $  kubectl get pods  --all-namespaces
    NAMESPACE     NAME                                        READY   STATUS    RESTARTS   AGE
    default       nginx-pod-5b5bc94455-ndcl6                  1/1     Running   0          18m
    default       nginx-pod-5b5bc94455-nptm5                  1/1     Running   0          18m
    default       nginx-pod-5b5bc94455-ptvzp                  1/1     Running   0          18m
    default       nginx-pod-5b5bc94455-vw667                  1/1     Running   0          18m

修改 Host 文件

172.23.216.49 k8s.dashboard.com
    172.23.216.49 traefik-ui.com
    172.23.216.49 k8s.nginx.com

访问 k8s.nginx.com 便可，查看 traefik-ui(对应 4个 Pod)。

![image][image 1]

# HTTPS 证书配置 #

生成自签名证书

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=traefik-ui.com"
    kubectl -n kube-system create secret tls traefik-ui-tls-cert --key=tls.key --cert=tls.crt

配置

apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: traefik-web-ui
      namespace: kube-system
      annotations:
        kubernetes.io/ingress.class: traefik
    spec:
      rules:
      - host: traefik-ui.com
        http:
          paths:
          - backend:
              serviceName: traefik-web-ui
              servicePort: 80
      tls:
       - secretName: traefik-ui-tls-cert

### 自动熔断 ###

在集群中，当某一个服务大量出现请求错误，或者请求响应时间过久，或者返回500+错误状态码时，我们希望可以主动剔除该服务，也就是不在将请求转发到该服务上，而这一个过程是自动完成，不需要人工执行。Traefik 通过配置很容易就能帮我们实现，Traefik 可以通过定义策略来主动熔断服务

举例：

*  NetworkErrorRatio() > 0.6：监测服务错误率达到60%时，熔断
 *  LatencyAtQuantileMS(60.0) > 60：监测延时大于60ms时，熔断
 *  ResponseCodeRatio(500, 600, 0, 600) > 0.5：监测返回状态码为\[500-600\]在\[0-600\]区间占比超过50%时，熔断

### 例子 ###

apiVersion: v1
    kind: Service
    metadata:
      name: wensleydale
      annotations:
        traefik.backend.circuitbreaker: "NetworkErrorRatio() > 0.6" 
        traefik.backend.circuitbreaker: LatencyAtQuantileMS(60.0) > 2000 #>2秒熔断

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[kubernetes_-flannel]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c005de5f4913b3e81d32cf98dc4f237be04b0c19e02f615650538a9aa0aabdc025604918&idx=1&mid=2247483855&scene=21&sn=26587a359cca53d129ab7e8a7fa394e0#wechat_redirect
[kubernetes_-calico]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c073de5f49658fdaed40affb1a9ea3f059e7df3cc90ae24b194a8698a7f73089d3964cab&idx=1&mid=2247483833&scene=21&sn=c00c2b69db7d06eacaf6206805d2955a#wechat_redirect
[kubernetes 1]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c05fde5f494917570591168d9e71f507c2d124312c51dfdb6cfb30eb03eb48b73a3e0d9b&idx=1&mid=2247483797&scene=21&sn=bc208ee075c41b81ffabaefe509538ba#wechat_redirect
[k8s 1]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c0b4de5f49a2eef8cc91afa81095b71eb093e94dce6eddbc7059583e819b1ac51c596ebb&idx=1&mid=2247483774&scene=21&sn=dfc3babde045fe99da9fa168cc9f0595#wechat_redirect
[-]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c0bfde5f49a9990c672e4434f5ae7b74004dc1982cc44801c524b58067d9b245e5ba5b71&idx=1&mid=2247483765&scene=21&sn=b8444e82a93535425349b509ded4e4b6#wechat_redirect
[Prometheus_MySQL]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c0aade5f49bc7df29ecb2280ab9e1a8aa905b31e36856bf8dc19b05ef60c5e7be0333b88&idx=1&mid=2247483744&scene=21&sn=1035d73f8cf39caf8534766435497590#wechat_redirect
[Prometheus_Nginx]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c095de5f4983c249b1b556fa6f8f60a0bb6991d2872079a9d5c28ce2ee17b8fc407eeb2c&idx=1&mid=2247483743&scene=21&sn=3ad15cd693685479dc7bf5dd628796d2#wechat_redirect
[Prometheus_Tomcat]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c086de5f499011eb542c6da8ead32b538c0bf06340ebe56ad439e2649e0b63efbcb4a611&idx=1&mid=2247483724&scene=21&sn=dd390f05270c6ac7a9c2b51fdc22f0ee#wechat_redirect
[linux]: http://mp.weixin.qq.com/s?__biz=MzIzOTQ3NDg1Mw%3D%3D&chksm=e928c0dede5f49c878898e04329f08d8adf554397476283aaa3f2554f71a8bf20986755fbcc9&idx=1&mid=2247483668&scene=21&sn=a7d0768b7eb034ef2e2f23e25b1b1845#wechat_redirect
[storageclass_pv]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb638837cc140121578456f6a5d679ae481421f2f3f1d5099bb7f2c56d00174fe61b2016061d&idx=1&mid=2247485218&scene=21&sn=ba698d444a029a2659091bfd81133697#wechat_redirect
[k8s_yaml_gitlab]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb638814cc1401028c7ab321d2ac6579f5c6d2b029fadc5687874e41470bf95aa09c01c33d45&idx=1&mid=2247485185&scene=21&sn=2b5646119a008d69948c5a84d3724c95#wechat_redirect
[helm_-_helm_k8s_]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb638bbbcc1402ad16d4b65b3db26cbd324c85819934077caa41969f0c9d573b71b21e2c51ff&idx=1&mid=2247484590&scene=21&sn=2c23098269c5df1e793aa47198a7b1e6#wechat_redirect
[k8s_Ingress-nginx]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb6385fdcc140ceb4a5cf902d24499ce3480f91aa97e0e0c7a1fb12a466865ff2f8dedc8be0c&idx=1&mid=2247486184&scene=21&sn=cccb2bc67ca74a01be7b4f79e05f8bec#wechat_redirect
[Prometheus Operator-_-]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb638626cc140f30c8d35e45239e6b559f7369b8c58bacd157a24e7b62313c826baec75f299f&idx=2&mid=2247485747&scene=21&sn=3da14a91d75f745b26c3aa8d10361d23#wechat_redirect
[Prometheus Operator-_]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb63865bcc140f4d8966d1c3745c8f69c6384337c43a1a8eda6e1ae488bd78f08e44c9553b19&idx=1&mid=2247485774&scene=21&sn=1b0301dadc4b737e19b1066219813db7#wechat_redirect
[kubeconfig_k8s_dashboard ui]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb638679cc140f6f4e024f2e7739b995fc235b6f4e97983a583bc9c7e82da88cf0fbf8736fe7&idx=1&mid=2247485804&scene=21&sn=c157f0596f130bd97ec745b278546c50#wechat_redirect
[token_k8s dashboard ui]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb638687cc140f918f04ca60ed188da26cd3ab37a79e6fdbf64531efd11ae60dac0a77788f7c&idx=2&mid=2247485842&scene=21&sn=163174142218e8dca3bb9a94ed173694#wechat_redirect
[kubernetes_etcd]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb63853bcc140c2d4c4da1b59a4865c193383392d92075cee80530866892d8a2a365e2b4e565&idx=1&mid=2247485998&scene=21&sn=9889882d1820ac005e5512eccb67c0f1#wechat_redirect
[Linux]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb638538cc140c2e581b8c673a9c529359042a2262ec112f8c3476c7408f25e04856f0b37bbd&idx=2&mid=2247485997&scene=21&sn=ac694beaf60cbf18d133eb6ebbc7a345#wechat_redirect
[kubernetes_EFK]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb63851fcc140c09d17fe6e270524da6c3ec3c5f3969f6f4f61a54c54724168801d93b2cda9d&idx=1&mid=2247485962&scene=21&sn=87dfde054f2ff489a1ffd28dfe02a435#wechat_redirect
[prometheus operator_k8s_haproxy]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb6386f0cc140fe6dea923cb07c2164db1c894c87d8c85d828aa269cdf4ae2d92eeb201adb67&idx=1&mid=2247485925&scene=21&sn=5ae9bc969963775e347c3a1f279d541c#wechat_redirect
[kubernetes ConfigMap]: http://mp.weixin.qq.com/s?__biz=MzU0NjEwMTg4Mg%3D%3D&chksm=fb63853acc140c2ca1dc3ca813b133ca7158c34df5cfe59cebf7621851ead91490eaabc74a1b&idx=1&mid=2247485999&scene=21&sn=f6b03745426149e498a8c7065b060e24#wechat_redirect
[format_png]: /images/20221124/d8b9e38fe39c4b648d14cf8b3a955fb4.png
[format_png 1]: /images/20221124/78deb7431859481396bf6e96ee733896.png