K8S 之 服务暴露Ingress Traefik 安装

一、POD服务暴露Ingress Traefik的理解

二、Ingress 数据流向

三、Ingress Traefik安装

在运维主机上运行

[root@test-operator traefik]# cd /data/k8s-yaml/ k8s-yaml]# mkdir traefik k8s-yaml]# cd traefik/ traefik]# docker pull traefik:v1.7.2-alpine traefik]# docker images|grep traefik traefik]# docker tag add5fac61ae5 traefik]# harbor.od.com/public/traefik:v1.7.2 traefik]# docker push test-harbor.cedarhd.com/public/traefik:v1.7.2 #创建四个资源配置清单 traefik]# vi rbac.yaml apiVersion: v1 kind: ServiceAccount metadata: name: traefik-ingress-controller namespace: kube-system --- apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRole 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 ------------------------------------------------------------------------------------------ traefik]# vi ds.yaml apiVersion: extensions/v1beta1 kind: DaemonSet metadata: name: traefik-ingress namespace: kube-system labels: k8s-app: traefik-ingress spec: template: metadata: labels: k8s-app: traefik-ingress name: traefik-ingress spec: serviceAccountName: traefik-ingress-controller terminationGracePeriodSeconds: 60 containers: - image: test-harbor.cedarhd.com/public/traefik:v1.7.2 name: traefik-ingress ports: - name: controller containerPort: 80 hostPort: 81 - name: admin-web containerPort: 8080 securityContext: capabilities: drop: - ALL add: - NET_BIND_SERVICE args: - --api - --kubernetes - --logLevel=INFO - --insecureskipverify=true - --kubernetes.endpoint=https://10.3.153.240:7443 - --accesslog - --accesslog.filepath=/var/log/traefik_access.log - --traefiklog - --traefiklog.filepath=/var/log/traefik.log - --metrics.prometheus ------------------------------------------------------------------------------------------ traefik]# vi svc.yaml kind: Service apiVersion: v1 metadata: name: traefik-ingress-service namespace: kube-system spec: selector: k8s-app: traefik-ingress ports: - protocol: TCP port: 80 name: controller - protocol: TCP port: 8080 name: admin-web ------------------------------------------------------------------------------------------ traefik]# vi ingress.yaml apiVersion: extensions/v1beta1 kind: Ingress metadata: name: traefik-web-ui namespace: kube-system annotations: kubernetes.io/ingress.class: traefik spec: rules: - host: test-traefik.cedarhd.com http: paths: - path: / backend: serviceName: traefik-ingress-service servicePort: 8080

在任意运算节点主机上运行

[root@test-nodes1 ~]# kubectl apply -f http://k8s-yaml.cedarhd.com/traefik/rbac.yaml serviceaccount/traefik-ingress-controller created clusterrole.rbac.authorization.k8s.io/traefik-ingress-controller created clusterrolebinding.rbac.authorization.k8s.io/traefik-ingress-controller created [root@test-nodes1 ~]# kubectl apply -f http://k8s-yaml.cedarhd.com/traefik/ds.yaml daemonset.extensions/traefik-ingress created [root@test-nodes1 ~]# kubectl apply -f http://k8s-yaml.cedarhd.com/traefik/svc.yaml service/traefik-ingress-service created [root@test-nodes1 ~]# kubectl apply -f http://k8s-yaml.cedarhd.com/traefik/ingress.yaml ingress.extensions/traefik-web-ui created [root@test-nodes1 ~]# systemctl restart docker.service #重启两台运算节点的docker [root@test-nodes2 ~]# kubectl get pods -n kube-system #检查运行情况 NAME READY STATUS RESTARTS AGE coredns-6c69fbcc6c-6vqgr 1/1 Running 0 18h traefik-ingress-44ptk 1/1 Running 0 22m traefik-ingress-vrvr4 1/1 Running 0 22m

四、分别在master/standby proxy做域名解释跳转

[root@test-master ~]# vi /etc/nginx/conf.d/cedarhd.com.conf upstream default_backend_traefik { server 10.3.153.221:81 max_fails=3 fail_timeout=10s; server 10.3.153.222:81 max_fails=3 fail_timeout=10s; } server { server_name *.cedarhd.com; location / { proxy_pass http://default_backend_traefik; proxy_set_header Host $http_host; proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for; } } [root@test-master ~]# nginx -t nginx: the configuration file /etc/nginx/nginx.conf syntax is ok nginx: configuration file /etc/nginx/nginx.conf test is successful [root@test-master ~]# nginx -s reload #备注，在DNS主机上把test-traefik.cedarhd.com的域名解释到VIP地址(10.3.153.240)上。