.Net微服务实战之Kubernetes的搭建与使用(三)

简介: .Net微服务实战之Kubernetes的搭建与使用(三)

先拉取依赖镜像


docker pull  quay.io/coreos/flannel:v0.12.0-amd64


把上面文件保存到服务器然后执行下面命令


kubectl apply -f kube-flannel.yml


image.png


安装dashboard


在master节点(server-a)安装dashboard组件


继续用梯子下载recommended.yml文件


https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml


没梯子的可以复制下方原文件


# Copyright 2017 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
apiVersion: v1
kind: Namespace
metadata:
  name: kubernetes-dashboard
---
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
---
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
  selector:
    k8s-app: kubernetes-dashboard
---
apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-certs
  namespace: kubernetes-dashboard
type: Opaque
---
apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-csrf
  namespace: kubernetes-dashboard
type: Opaque
data:
  csrf: ""
---
apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-key-holder
  namespace: kubernetes-dashboard
type: Opaque
---
kind: ConfigMap
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-settings
  namespace: kubernetes-dashboard
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
rules:
  # Allow Dashboard to get, update and delete Dashboard exclusive secrets.
  - apiGroups: [""]
    resources: ["secrets"]
    resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs", "kubernetes-dashboard-csrf"]
    verbs: ["get", "update", "delete"]
    # Allow Dashboard to get and update 'kubernetes-dashboard-settings' config map.
  - apiGroups: [""]
    resources: ["configmaps"]
    resourceNames: ["kubernetes-dashboard-settings"]
    verbs: ["get", "update"]
    # Allow Dashboard to get metrics.
  - apiGroups: [""]
    resources: ["services"]
    resourceNames: ["heapster", "dashboard-metrics-scraper"]
    verbs: ["proxy"]
  - apiGroups: [""]
    resources: ["services/proxy"]
    resourceNames: ["heapster", "http:heapster:", "https:heapster:", "dashboard-metrics-scraper", "http:dashboard-metrics-scraper"]
    verbs: ["get"]
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
rules:
  # Allow Metrics Scraper to get metrics from the Metrics server
  - apiGroups: ["metrics.k8s.io"]
    resources: ["pods", "nodes"]
    verbs: ["get", "list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard
---
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      containers:
        - name: kubernetes-dashboard
          image: kubernetesui/dashboard:v2.0.3
          imagePullPolicy: Always
          ports:
            - containerPort: 8443
              protocol: TCP
          args:
            - --auto-generate-certificates
            - --namespace=kubernetes-dashboard
            # Uncomment the following line to manually specify Kubernetes API server Host
            # If not specified, Dashboard will attempt to auto discover the API server and connect
            # to it. Uncomment only if the default does not work.
            # - --apiserver-host=http://my-address:port
          volumeMounts:
            - name: kubernetes-dashboard-certs
              mountPath: /certs
              # Create on-disk volume to store exec logs
            - mountPath: /tmp
              name: tmp-volume
          livenessProbe:
            httpGet:
              scheme: HTTPS
              path: /
              port: 8443
            initialDelaySeconds: 30
            timeoutSeconds: 30
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      volumes:
        - name: kubernetes-dashboard-certs
          secret:
            secretName: kubernetes-dashboard-certs
        - name: tmp-volume
          emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
---
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 8000
      targetPort: 8000
  selector:
    k8s-app: dashboard-metrics-scraper
---
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: dashboard-metrics-scraper
  template:
    metadata:
      labels:
        k8s-app: dashboard-metrics-scraper
      annotations:
        seccomp.security.alpha.kubernetes.io/pod: 'runtime/default'
    spec:
      containers:
        - name: dashboard-metrics-scraper
          image: kubernetesui/metrics-scraper:v1.0.4
          ports:
            - containerPort: 8000
              protocol: TCP
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 8000
            initialDelaySeconds: 30
            timeoutSeconds: 30
          volumeMounts:
          - mountPath: /tmp
            name: tmp-volume
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "kubernetes.io/os": linux
      # Comment the following tolerations if Dashboard must not be deployed on master
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      volumes:
        - name: tmp-volume
          emptyDir: {}


spec:
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30221
  selector:
    k8s-app: kubernetes-dashboard


第137行开始,修改账户权限,主要三个参数,kind: ClusterRoleBinding,roleRef-kind: ClusterRole,roleRef-name: cluster-admin


---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard
---


保存到服务器后执行以下命令


kubectl apply -f recommended.yaml


等待一段时间启动成功后,https://ip+nodePort,查看UI


image.png


Token通过下面指令获取


kubectl -n kubernetes-dashboard get secret


kubectl describe secrets -n kubernetes-dashboard kubernetes-dashboard-token-kfcp2  | grep token | awk'NR==3{print $2}'


image.png


加入Worker节点


在server-b与server-c执行下面操作


把上面init后的那句join拷贝过来,如果忘记了可以在master节点执行下面指令:

kubeadm token list


openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed's/^.* //'


image.png


通过返回的数据拼装成下面指令


kubeadm join192.168.88.138:6443 --token 2zebwy.1549suwrkkven7ow  --discovery-token-ca-cert-hash

sha256:c61af74d6e4ba1871eceaef4e769d14a20a86c9276ac0899f8ec6b08b89f532b


image.png


查看节点信息


kubectl get node

image.png

image.png


部署Web应用


在master节点(sever-a)执行下面操作

  

部署应用前建议有需要的朋友到【.Net微服务实战之CI/CD】看看如何搭建docker私有仓库,后面需要用到,搭建后私有库后执行下面指令


kubectl create secret docker-registry docker-registry-secret --docker-server=192.168.88.141:6000 --docker-username=admin --docker-password=123456789

  

docker-server就是docker私有仓库的地址

  

下面是yaml模板,注意imagePullSecrets-name与上面的命名的一致,其余的可以查看yaml里的注释



apiVersion: apps/v1
kind: Deployment # Deployment为多个Pod副本
metadata:
  name: testdockerswarm-deployment
  labels:
    app: testdockerswarm-deployment
spec:
  replicas: 2 # 实例数量
  selector:
    matchLabels: # 定义该部署匹配哪些Pod
      app: testdockerswarm
  minReadySeconds: 3 # 可选,指定Pod可以变成可用状态的最小秒数,默认是0
  strategy:
    type: RollingUpdate # 部署策略类型,使用RollingUpdate可以保证部署期间服务不间断
    rollingUpdate:
      maxUnavailable: 1 # 部署时最大允许停止的Pod数量
      maxSurge: 1 # 部署时最大允许创建的Pod数量
  template: # 用来指定Pod的模板,与Pod的定义类似
    metadata:
      labels: # Pod标签,与上面matchLabels对应
        app: testdockerswarm
    spec:
      imagePullSecrets:
        - name: docker-registry-secret
      containers:
        - name: testdockerswarm
          image: 192.168.88.141:6000/testdockerswarm
          imagePullPolicy: Always # Always每次拉去新镜像
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: testdockerswarm-service
  labels:  
    name: testdockerswarm-service
spec:
  selector:
    app: testdockerswarm #与template-labels参数pod标签一致
  ports:
    - protocol: TCP
      port: 80 #clusterIP开放的端口
      targetPort: 80 #container开放的端口,与containerPort一致
      nodePort: 31221 # 所有的节点都会开放此端口,此端口供外部调用。
  type: NodePort

  

把yaml文件保存到服务器后执行下面命令


kubectl create -f testdockerswarm.yml


image.png

  

整个搭建部署的过程基本上到这里结束了。

image.png


访问


可以通过指令kubectl get service得到ClusterIP,分别在server-c和sever-b执行curl 10.10.184.184


image.png


也可以通过执行kubectl get pods -o wide得到pod ip,在server-c执行curl 10.122.2.5 和 server-b执行curl 10.122.1.7


image.png


也可以在外部访问 server-c和server-b的 ip + 31221


image.png


  

如果节点有异常可以通过下面指令排查

journalctl -f -u kubelet.service | grep -i error -C 500

  

如果Pod无法正常running可以通过下面指令查看

kubectl describe pod testdockerswarm-deployment-7bc647d87d-qwvzm

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