K8s之traefik（ingess）发布服务-实战

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k8s之traefik（ingess）发布服务实战
上篇描述了基于k8s集群安装部署traefik作为ingress服务，简单演示了一下发布服务，本篇将细节讲述如果结合traefik发布业务服务。
安装部署参考：
https://blog.51cto.com/michaelkang/2429929
版本介绍
traefik：v1.7k8s：v1.15.1快速部署traefik
如果你的k8s集群已经部署完成，想快速部署traefik，执行命令如下：
kubectl create -f https://raw.githubusercontent.com/containous/traefik/v1.7/examples/k8s/traefik-rbac.yamlkubectl create -f https://raw.githubusercontent.com/containous/traefik/v1.7/examples/k8s/traefik-ds.yaml执行成功，在浏览器数据一个node节点的ip地址：8080 端口即可看到traefik的管理页面。实战开始
编写一个业务yaml文件
如果对yaml不太熟悉，看这边：https://blog.51cto.com/michaelkang/2429745
---#配置deploymentkind: deploymentapiversion: extensions/v1beta1metadata:#设置dm名称 name: dm-pttest#添加标签 pttest labels: app: pttestspec:# 通过replicas声明pod个数是2 replicas: 2# 通过标签选择被控制的pod selector: matchlabels: app: pttest# 在template中定义pod template: metadata:# 给pod打上标签app=pttest labels: app: pttest spec: containers:# 声明容器名称，注意不是pod名称，pod名称应该定义在metadata中 - name: myapp image: ikubernetes/myapp:v1 ports: - containerport: 80---#服务配置apiversion: v1# 声明一个service资源对象kind: servicemetadata:#pod 名称 name: svcpttest labels: app: pttest annotations:#检查后端服务返回错误率，大于p，踢出集群 traefik.backend.circuitbreaker: networkerrorratio() > 0.5spec: ports: - name: http port: 80 selector: app: pttest---#配置ingressapiversion: extensions/v1beta1kind: ingressmetadata: name: myapp-traefik-ingress annotations: kubernetes.io/ingress.class: traefikspec: rules: - host: pttest.pt.com http: paths: - path: /#指定后端服务 backend: servicename: svcpttest serviceport: 80验证服务
#查看服务[root@kubm-02 traefik]# kubectl get svc -o widename type cluster-ip external-ip port(s) age selectorsvcpttest clusterip 10.245.148.114 <none> 80/tcp 2m12s app=pttest <==lable#查看container[root@kubm-02 traefik]# kubectl get pods -o widename ready status restarts age ip node nominated node readiness gatesdm-pttest-6f6cd797f5-cdjk5 1/1 running 0 63s 10.244.3.115 kubnode-01 <none> <none>dm-pttest-6f6cd797f5-tqh64 1/1 running 0 63s 10.244.4.135 kubnode-02 <none> <none>#ingress 信息[root@kubm-02 traefik]# kubectl get ingress name hosts address ports agemyapp-traefik-ingress pttest.pt.com 80 23s#deployment[root@kubm-02 traefik]# kubectl get deployname ready up-to-date available agedm-pttest 2/2 2 2 12m验证访问：
请求pttest.pt.com，?服务svcpttest会把请求负载给后端的pod。
#请求两次分别返回两个[root@kubm-02 traefik]# curl -h host:pttest.pt.com http://172.20.101.166/hostname.htmldm-pttest-6f6cd797f5-cdjk5[root@kubm-02 traefik]# curl -h host:pttest.pt.com http://172.20.101.166/hostname.htmldm-pttest-6f6cd797f5-tqh64扩容节点
kubectl edit deployment dm-pttest
apiversion: extensions/v1beta1kind: deploymentmetadata: annotations: deployment.kubernetes.io/revision: 1 creationtimestamp: 2019-08-16t10:13:49z generation: 1 labels: app: pttest name: dm-pttest namespace: default resourceversion: 3871589 selflink: /apis/extensions/v1beta1/namespaces/default/deployments/dm-pttest uid: 153a60fb-66df-4884-aa9a-49ac47cebd2cspec: progressdeadlineseconds: 2147483647 replicas: 5 《=====pod数量，有默认2个，调整到5个保存退出，k8s集群会自动执行；验证
kubectl get pods
[root@kubm-02 traefik]# kubectl get podsname ready status restarts agedm-pttest-6f6cd797f5-cdjk5 1/1 running 0 17mdm-pttest-6f6cd797f5-qd4cl 1/1 running 0 99sdm-pttest-6f6cd797f5-r25dc 1/1 running 0 99sdm-pttest-6f6cd797f5-tbfmh 1/1 running 0 99sdm-pttest-6f6cd797f5-tqh64 1/1 running 0 17m#请求[root@kubm-02 traefik]# curl

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