1、traefik
traefik：HTTP层路由，官网：http://traefik.cn/，文档：https://docs.traefik.io/user-guide/kubernetes/
功能和nginx ingress类似。
相对于nginx ingress，traefix能够实时跟Kubernetes API 交互，感知后端 Service、Pod 变化，自动更新配置并热重载。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。
k8s集群部署Traefik，结合上一篇文章。
创建k8s-master-lb的证书：
[root@k8s-master01 ~]# openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=k8s-master-lb" Generating a 2048 bit RSA private key ................................................................................................................+++ .........................................................................................................................................................+++ writing new private key to 'tls.key'
把证书写入到k8s的secret
[root@k8s-master01 ~]# kubectl -n kube-system create secret generic traefik-cert --from-file=tls.key --from-file=tls.crt secret/traefik-cert created
安装traefix
[root@k8s-master01 kubeadm-ha]# kubectl apply -f traefik/ serviceaccount/traefik-ingress-controller created clusterrole.rbac.authorization.k8s.io/traefik-ingress-controller created clusterrolebinding.rbac.authorization.k8s.io/traefik-ingress-controller created configmap/traefik-conf created daemonset.extensions/traefik-ingress-controller created service/traefik-web-ui created ingress.extensions/traefik-jenkins created
查看pods，因为创建的类型是DaemonSet所有每个节点都会创建一个Traefix的pod
[root@k8s-master01 kubeadm-ha]# kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system calico-node-kwz9t 2/2 Running 0 20h kube-system calico-node-nfhrd 2/2 Running 0 56m kube-system calico-node-nxtlf 2/2 Running 0 57m kube-system calico-node-rj8p8 2/2 Running 0 20h kube-system calico-node-xfsg5 2/2 Running 0 20h kube-system coredns-777d78ff6f-4rcsb 1/1 Running 0 22h kube-system coredns-777d78ff6f-7xqzx 1/1 Running 0 22h kube-system etcd-k8s-master01 1/1 Running 0 16h kube-system etcd-k8s-master02 1/1 Running 0 21h kube-system etcd-k8s-master03 1/1 Running 9 20h kube-system heapster-5874d498f5-ngk26 1/1 Running 0 16h kube-system kube-apiserver-k8s-master01 1/1 Running 0 16h kube-system kube-apiserver-k8s-master02 1/1 Running 0 20h kube-system kube-apiserver-k8s-master03 1/1 Running 1 20h kube-system kube-controller-manager-k8s-master01 1/1 Running 0 16h kube-system kube-controller-manager-k8s-master02 1/1 Running 1 20h kube-system kube-controller-manager-k8s-master03 1/1 Running 0 20h kube-system kube-proxy-4cjhm 1/1 Running 0 22h kube-system kube-proxy-kpxhz 1/1 Running 0 56m kube-system kube-proxy-lkvjk 1/1 Running 2 21h kube-system kube-proxy-m7htq 1/1 Running 0 22h kube-system kube-proxy-r4sjs 1/1 Running 0 57m kube-system kube-scheduler-k8s-master01 1/1 Running 2 16h kube-system kube-scheduler-k8s-master02 1/1 Running 0 21h kube-system kube-scheduler-k8s-master03 1/1 Running 2 20h kube-system kubernetes-dashboard-7954d796d8-2k4hx 1/1 Running 0 17h kube-system metrics-server-55fcc5b88-bpmkm 1/1 Running 0 16h kube-system monitoring-grafana-9b6b75b49-4zm6d 1/1 Running 0 18h kube-system monitoring-influxdb-655cd78874-56gf8 1/1 Running 0 16h kube-system traefik-ingress-controller-cv2jg 1/1 Running 0 28s kube-system traefik-ingress-controller-d7lzw 1/1 Running 0 28s kube-system traefik-ingress-controller-r2z29 1/1 Running 0 28s kube-system traefik-ingress-controller-tm6vv 1/1 Running 0 28s kube-system traefik-ingress-controller-w4mj7 1/1 Running 0 28s
打开Traefix的Web UI：http://k8s-master-lb:30011/
创建测试web应用
[root@k8s-master01 ~]# cat traefix-test.yaml apiVersion: v1 kind: Service metadata: name: nginx-svc spec: template: metadata: labels: name: nginx-svc namespace: traefix-test spec: selector: run: ngx-pod ports: - protocol: TCP port: 80 targetPort: 80 --- apiVersion: apps/v1beta1 kind: Deployment metadata: name: ngx-pod spec: replicas: 4 template: metadata: labels: run: ngx-pod spec: containers: - name: nginx image: nginx:1.10 ports: - containerPort: 80 --- apiVersion: extensions/v1beta1 kind: Ingress metadata: name: ngx-ing annotations: kubernetes.io/ingress.class: traefik spec: rules: - host: traefix-test.com http: paths: - backend: serviceName: nginx-svc servicePort: 80
[root@k8s-master01 ~]# kubectl create -f traefix-test.yaml service/nginx-svc created deployment.apps/ngx-pod created ingress.extensions/ngx-ing created
traefix UI查看
k8s查看
访问测试：将域名http://traefix-test.com/解析到任何一个node节点即可访问 
HTTPS证书配置
利用上述创建的nginx，再次创建https的ingress
[root@k8s-master01 nginx-cert]# cat ../traefix-https.yaml apiVersion: extensions/v1beta1 kind: Ingress metadata: name: nginx-https-test namespace: default annotations: kubernetes.io/ingress.class: traefik spec: rules: - host: traefix-test.com http: paths: - backend: serviceName: nginx-svc servicePort: 80 tls: - secretName: nginx-test-tls
创建证书，线上为公司购买的证书
[root@k8s-master01 nginx-cert]# openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=traefix-test.com" Generating a 2048 bit RSA private key .................................+++ .........................................................+++ writing new private key to 'tls.key' -----
导入证书
kubectl -n default create secret tls nginx-test-tls --key=tls.key --cert=tls.crt
创建ingress
[root@k8s-master01 ~]# kubectl create -f traefix-https.yaml
ingress.extensions/nginx-https-test created
访问测试：
其他方法查看官方文档：https://docs.traefik.io/user-guide/kubernetes/
2、安装prometheus
安装prometheus
[root@k8s-master01 kubeadm-ha]# kubectl apply -f prometheus/ clusterrole.rbac.authorization.k8s.io/prometheus created clusterrolebinding.rbac.authorization.k8s.io/prometheus created configmap/prometheus-server-conf created deployment.extensions/prometheus created service/prometheus created
pod查看
[root@k8s-master01 kubeadm-ha]# kubectl get pods --all-namespaces | grep prome kube-system prometheus-56dff8579d-x2w62 1/1 Running 0 52s
访问地址：http://k8s-master-lb:30013/
安装使用grafana(此处使用自装grafana)
yum install https://s3-us-west-2.amazonaws.com/grafana-releases/release/grafana-4.4.3-1.x86_64.rpm -y
启动grafana
[root@k8s-master01 grafana-dashboard]# systemctl start grafana-server [root@k8s-master01 grafana-dashboard]# systemctl enable grafana-server Created symlink from /etc/systemd/system/multi-user.target.wants/grafana-server.service to /usr/lib/systemd/system/grafana-server.service.
访问：http://192.168.20.20:3000，账号密码admin，配置prometheus的DataSource
导入模板：文件路径/root/kubeadm-ha/heapster/grafana-dashboard 
导入后如下
查看数据
grafana文档：http://docs.grafana.org/
3、集群验证
验证集群高可用
创建一个副本为3的deployment
[root@k8s-master01 ~]# kubectl run nginx --image=nginx --replicas=3 --port=80 deployment.apps/nginx created [root@k8s-master01 ~]# kubectl get deployment --all-namespaces NAMESPACE NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE default nginx 3 3 3 3 58s
查看pods
[root@k8s-master01 ~]# kubectl get pods -l=run=nginx -o wide NAME READY STATUS RESTARTS AGE IP NODE nginx-6f858d4d45-7lv6f 1/1 Running 0 1m 172.168.5.16 k8s-node01 nginx-6f858d4d45-g2njj 1/1 Running 0 1m 172.168.0.18 k8s-master01 nginx-6f858d4d45-rcz89 1/1 Running 0 1m 172.168.6.12 k8s-node02
创建service
[root@k8s-master01 ~]# kubectl expose deployment nginx --type=NodePort --port=80 service/nginx exposed [root@k8s-master01 ~]# kubectl get service -n default NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1443/TCP 1d nginx NodePort 10.97.112.176 80:32546/TCP 29s
访问测试
测试HPA自动弹性伸缩
# 创建测试服务 kubectl run nginx-server --requests=cpu=10m --image=nginx --port=80 kubectl expose deployment nginx-server --port=80 # 创建hpa kubectl autoscale deployment nginx-server --cpu-percent=10 --min=1 --max=10
查看当前nginx-server的ClusterIP
[root@k8s-master01 ~]# kubectl get service -n default NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1443/TCP 1d nginx-server ClusterIP 10.108.160.23 80/TCP 5m
给测试服务增加负载
[root@k8s-master01 ~]# while true; do wget -q -O- http://10.108.160.23 > /dev/null; done
查看当前扩容情况
终止增加负载，结束增加负载后，pod自动缩容（自动缩容需要大概10-15分钟）
删除测试数据
[root@k8s-master01 ~]# kubectl delete deploy,svc,hpa nginx-server deployment.extensions "nginx-server" deleted service "nginx-server" deleted horizontalpodautoscaler.autoscaling "nginx-server" deleted
4、集群稳定性测试
关闭master01电源
master02查看
[root@k8s-master02 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION k8s-master01 NotReady master 1d v1.11.1 k8s-master02 Ready master 1d v1.11.1 k8s-master03 Ready master 1d v1.11.1 k8s-node01 Ready22h v1.11.1 k8s-node02 Ready 22h v1.11.1
访问测试
VIP以漂移至master02
关闭集群所有节点(直接断电，非正常关机)
重新开机
查看节点状态
[root@k8s-master01 ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION k8s-master01 Ready master 2d v1.11.1 k8s-master02 Ready master 2d v1.11.1 k8s-master03 Ready master 2d v1.11.1 k8s-node01 Ready1d v1.11.1 k8s-node02 Ready 1d v1.11.1
查看所有pods
[root@k8s-master01 ~]# kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system calico-node-kwz9t 2/2 Running 2 2d kube-system calico-node-nfhrd 2/2 Running 2 1d kube-system calico-node-nxtlf 2/2 Running 2 1d kube-system calico-node-rj8p8 2/2 Running 2 2d kube-system calico-node-xfsg5 2/2 Running 2 2d kube-system coredns-777d78ff6f-dctjh 1/1 Running 1 8h kube-system coredns-777d78ff6f-ljpqs 1/1 Running 1 8h kube-system etcd-k8s-master01 1/1 Running 1 6m kube-system etcd-k8s-master02 1/1 Running 1 21m kube-system etcd-k8s-master03 1/1 Running 13 2d kube-system heapster-5874d498f5-rv25x 1/1 Running 1 8h kube-system kube-apiserver-k8s-master01 1/1 Running 2 6m kube-system kube-apiserver-k8s-master02 1/1 Running 1 21m kube-system kube-apiserver-k8s-master03 1/1 Running 8 2d kube-system kube-controller-manager-k8s-master01 1/1 Running 2 6m kube-system kube-controller-manager-k8s-master02 1/1 Running 3 21m kube-system kube-controller-manager-k8s-master03 1/1 Running 2 2d kube-system kube-proxy-4cjhm 1/1 Running 1 2d kube-system kube-proxy-kpxhz 1/1 Running 1 1d kube-system kube-proxy-lkvjk 1/1 Running 3 2d kube-system kube-proxy-m7htq 1/1 Running 1 2d kube-system kube-proxy-r4sjs 1/1 Running 1 1d kube-system kube-scheduler-k8s-master01 1/1 Running 4 6m kube-system kube-scheduler-k8s-master02 1/1 Running 1 21m kube-system kube-scheduler-k8s-master03 1/1 Running 5 2d kube-system kubernetes-dashboard-7954d796d8-2k4hx 1/1 Running 1 1d kube-system metrics-server-55fcc5b88-bpmkm 1/1 Running 1 1d kube-system monitoring-influxdb-655cd78874-ccrgl 1/1 Running 1 8h kube-system prometheus-56dff8579d-28qm5 1/1 Running 1 28m kube-system traefik-ingress-controller-cv2jg 1/1 Running 1 1d kube-system traefik-ingress-controller-d7lzw 1/1 Running 1 1d kube-system traefik-ingress-controller-r2z29 1/1 Running 1 1d kube-system traefik-ingress-controller-tm6vv 1/1 Running 1 1d kube-system traefik-ingress-controller-w4mj7 1/1 Running 1 1d
访问测试
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