k8s安装

#在这里插入代码片
#在三台VM虚拟机下的centos7上部署了k8s集群，记录如下：
# 172.16.0.131
# 172.16.0.132
# 172.16.0.133

#centos系统的master及node下操作
#关闭防火墙:
systemctl stop firewalld
systemctl disable firewalld
systemctl status firewalld

#关闭selinux:
sed -i 's/enforcing/disabled/' /etc/selinux/config # 永久
setenforce 0 # 临时

#关闭swap:
swapoff -a # 临时
vim /etc/fstab # 永久     注释关于swap的那一行，在最后一行。

#修改主机名hostname:
hostnamectl set-hostname <hostname> # 这一步可以不做

#添加hosts（软路由，相当于内部DNS）：
cat >> /etc/hosts << EOF
172.16.0.131  master
172.16.0.132  node1
172.16.0.133  node2
EOF

sysctl --system # 生效

#将桥接的 IPv4 流量传递到 iptables 的链：
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sysctl --system # 生效

#时间同步：
yum install ntpdate -y
ntpdate time.windows.com
date

#安装docker,kubernetes默认CRI（容器运行时）为docker:
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum -y install docker-ce-18.06.1.ce-3.el7
systemctl enable docker && systemctl start docker
docker --version

#设置docker仓库地址：
mkdir /etc/docker
cat > /etc/docker/daemon.json << EOF
{
"exec-opts": ["native.cgroupdriver=systemd"]  #可选，最好改成systemd
"registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF
systemctl daemon-reload && systemctl restart docker

#添加 yum 源：
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

#安装 kubeadm，kubelet和 kubectl:
yum install -y kubelet-1.17.0 kubeadm-1.17.0 kubectl-1.17.0
systemctl enable kubelet  #必须设置自启动,否则后面不好弄。

#从下面开始centos系统的master和node就不一样了。
##########################################################################################################################
#centos系统的master:
#部署kubernetes master: 假如master的IP是172.16.0.131
#由于默认拉取镜像地址 k8s.gcr.io 国内无法访问，这里指定阿里云镜像仓库地址。
kubeadm init \
--apiserver-advertise-address=172.16.0.131 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.17.0 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16

#如果失败上一步kubeadm init,请执行,再次尝试
kubeadm reset

#使用kubectl工具：
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

#安装pod网络插件（CNI）,该flannel网络插件本质上就是一个运行的pod,这里给出的是一个部署yaml文件
kubectl apply -f kube-flannel.yaml
# 该yaml文件是通用的，可以去github下载，或者在apply -f执行指令中加入github下载地址。
# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

#查看master状态
kubectl get nodes
kubectl get pod -n kube-system
kubectl get pod --all-namespaces -o wide

# 如果k8s节点状态为notready，使用kubetcl get nodes查看已加入的节点详细信息。
kubectl get pod -n kube-system

#获取token，为node加入做准备.
kubeadm token create --print-join-command

##########################################################################################################################
# centos系统的node
kubeadm join 192.168.31.61:6443  --token n2vb26.1nzx4628932e7r8n     --discovery-token-ca-cert-hash sha256:74cac4b44cbb7ae95d57ce86ea6602bac9d1b2fade82e224b929f1ce6f918196 

# --token后面的东西在master里面可以获取的

##########################################################################################################################
# 部署dashboard，master上执行。
kubectl create -f recommended.yaml

# 查看namespace下的kubernetes-dashboard下的资源
kubectl get pod,svc -n kubernetes-dashboard

# 创建访问账户，获取token。
kubectl create serviceaccount dashboard-admin -n kubernetes-dashboard

# 授权
kubectl create clusterrolebinding dashboard-admin-rb --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:dashboard-admin

# 获取账号
kubectl get secrets -n kubernetes-dashboard | grep dashboard-admin
# 效果大概是 dashboard-admin-token-xbqhh        kubernetes.io/service-account-token   3      2m35s

# 下面的内容就比较重要了，需要一环扣一环。

# 获取上面的那个账号的token，这里需要指定账号是上面那个账号，否则无法获取token。
kubectl describe secrets dashboard-admin-token-xbqhh -n kubernetes-dashboard

# 效果大概是 
Name:         dashboard-admin-token-h9grx
Namespace:    kubernetes-dashboard
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard-admin
              kubernetes.io/service-account.uid: 51bca19b-a160-47f3-b9f7-859a118767b8

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1025 bytes
namespace:  20 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6Im05UG52Y3J3UXlTdUpWM2p3eHZ0UUl3UFJzUmxLXzVvVDNWRU9CMXo0V00ifQ.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.004PFYEr97iiHafK4zwgBZwDpdtJBkaXxJb_abZeWiO-XJjTaKCeMLl85CUCgsMNNUfi08a2BjSwMbMxSkOnUJJHyetREKb4FaumfBGyjaXtZH4kyOFY0HUUkiQpSSZ2HmZRcfzrxhihzF7gYtia0zFGLKE194qtd56zBcOmFeinHjzZblKUoWaLyk29c2C2R54hWXY3woIutdKDQg6VnkeEgI0iw5aXaFu2lt7ZgF9ryNjx21Mrs2YyiDxhjytROvmt7k0lKOO91TaFF2qWqbrp9l0fBmB8XE815cwm1t18-eb1eEsRVCt6JM_WRVgWPoZdbacdHuwMRwQ601r92Q

# 通过浏览器访问dashboard的UI
# 注意，需要使用https访问，否则无法过安全限制，然后一通信任就行，输入token就行。
# https://172.16.0.131:3009  
# https://172.16.0.132:3009
# https://172.16.0.133:3009
# 在集群的任何一个外部IP都可以访问，30009则是在recommended.yaml中指定的，同时还指定了type:NodePort，这也是能够使用dashboard的原因。
# 缺点，浏览器很快就会忘记token，需要经常输入token。

# 怎样用dashboard代替kubectl命令和yaml指令去部署新的pod
# dashboard右上角有一个加号，点击以后，选择从表单创建。
# 填写公共镜像的URL，或者是托管于Docker Hub等仓库上的私有镜像URL   registry.hub.docker.com 不太好用。

# k8s常用指令
# k8s删除pod一直处于terminating状态
# 强制删除
kubectl delete pod PODNAME --force --grace-period=0

# 查看master上是否可以运行pod（有一种机制叫做污点机制，自己查找。）,如果要查node1,换成node1就行。
kubectl describe node master |grep Taints
# Taints: node-role.kubernetes.io/master:NoSchedule #有污点
# Taints: <none> #无污点

# 去除污点（master，也可以是其它）
kubectl taint nodes master node-role.kubernetes.io/master-
# 加污点（master，也可以是其它）
kubectl taint nodes master node-role.kubernetes.io/master=:NoSchedule

# 部署pod,最好是先将镜像下载到本地,然后再部署,这样只要几秒钟就好了。
# 记得在container下写上 imagePullPolicy: Never,这样就会使用本地镜像,否则默认imagePullPolicy: Always,从网上去下载镜像,奇慢无比。
# 粘贴一个nginx的部署文档如下:
apiVersion: v1
kind: Pod
metadata:
  name: pod-test
  namespace: default
spec:
  containers:
  - name: nginx
    image: nginx:latest
    imagePullPolicy: Never # 这里是我新增的
    #imagePullPolicy: IfNotPresent
    resources: # 资源配额
      limits:  # 限制资源（上限）
        cpu: "2" # CPU限制，单位是core数
        memory: "10Gi" # 内存限制
      requests: # 请求资源（下限）
        cpu: "1"  # CPU限制，单位是core数
        memory: "10Mi"  # 内存限制

########################################################################################################################
# 一些默认机制会自动补全，效果如下:
kind: Pod
apiVersion: v1
metadata:
  name: pod-test
  namespace: default
  selfLink: /api/v1/namespaces/default/pods/pod-test
  uid: 8b0e14c8-77ed-458f-bded-a104c78cc0af
  resourceVersion: '375674'
  creationTimestamp: '2021-08-13T06:13:33Z'
spec:
  volumes:
    - name: default-token-fwbxj
      secret:
        secretName: default-token-fwbxj
        defaultMode: 420
  containers:
    - name: nginx
      image: nginx:latest
      resources:
        limits:
          cpu: '2'
          memory: 10Gi
        requests:
          cpu: '1'
          memory: 10Mi
      volumeMounts:
        - name: default-token-fwbxj
          readOnly: true
          mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      terminationMessagePath: /dev/termination-log
      terminationMessagePolicy: File
      imagePullPolicy: Never
  restartPolicy: Always
  terminationGracePeriodSeconds: 30
  dnsPolicy: ClusterFirst
  serviceAccountName: default
  serviceAccount: default
  nodeName: node2
  securityContext: {}
  schedulerName: default-scheduler
  tolerations:
    - key: node.kubernetes.io/not-ready
      operator: Exists
      effect: NoExecute
      tolerationSeconds: 300
    - key: node.kubernetes.io/unreachable
      operator: Exists
      effect: NoExecute
      tolerationSeconds: 300
  priority: 0
  enableServiceLinks: true
status:
  phase: Running
  conditions:
    - type: Initialized
      status: 'True'
      lastProbeTime: null
      lastTransitionTime: '2021-08-13T06:13:33Z'
    - type: Ready
      status: 'True'
      lastProbeTime: null
      lastTransitionTime: '2021-08-13T06:13:43Z'
    - type: ContainersReady
      status: 'True'
      lastProbeTime: null
      lastTransitionTime: '2021-08-13T06:13:43Z'
    - type: PodScheduled
      status: 'True'
      lastProbeTime: null
      lastTransitionTime: '2021-08-13T06:13:33Z'
  hostIP: 172.16.0.133
  podIP: 10.244.2.23
  podIPs:
    - ip: 10.244.2.23
  startTime: '2021-08-13T06:13:33Z'
  containerStatuses:
    - name: nginx
      state:
        running:
          startedAt: '2021-08-13T06:13:42Z'
      lastState: {}
      ready: true
      restartCount: 0
      image: nginx:latest
      imageID: >-
        docker-pullable://nginx@sha256:8f335768880da6baf72b70c701002b45f4932acae8d574dedfddaf967fc3ac90
      containerID: >-
        docker://adab96e6bf4bd74960d5bc6f7ffe831f131efcde8a298bf5f1d052a8572754d0
      started: true
  qosClass: Burstable


########################################################################################################################
# 写到这里，有必要把kubeedge也装一下了。
# kubeedge 分为cloudcore和edgecore两种角色，其中cloudcore和k8s的master节点角色是一致的。
# cloudcore 在前面安装k8s的时候，已经处理好了关闭防火墙、关闭交换分区、安装docker(cgroup为cgroups，此处不影响)等等
# edgecore 由于前面还没有做好前序处理，所以需要做一些前序处理，大致相同，不同点是docker的cgroup必须改成systemed。
# edgecore 可以选择的平台有树莓派和乌班图。

# centos系统的cloudcore云
# 将执行脚本keadm-v1.4.0-linux-amd64.tar.gz传输到/etc/local下，解压，进入，再进入keadm，然后
./keadm init --advertise-address="172.16.0.131" --kubeedge-version=1.6.0
# 这里假如172.06.0.131是cloudcore的IP
./keadm gettoken获取token

# raspberry系统的edgecore
# 将执行脚本keadm-v1.4.0-linux-arm.tar.gz传输到/etc/local下，解压，进入，再进入keadm，然后
./keadm join --cloudcore-ipport=172.16.0.104:10000 --edgenode-name=edge-node --kubeedge-version=1.6.0 --token=9d7fd2b69e36697d64a7e1af53d0bc22da768c8a1471fc4ad312548ff2f69c53.eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE2MjA4MDkxMzJ9.xJBNI__mxbzSxzQpZCYqTd4YdKkFTI1bmWijPo6PqLg
# 这里的 	token是从cloudcore获取的。

#kube-flannel.yaml文件
#严格注意空格格式，否则会失效

---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
  name: psp.flannel.unprivileged
  annotations:
    seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
    seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
    apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
    apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
  privileged: false
  volumes:
    - configMap
    - secret
    - emptyDir
    - hostPath
  allowedHostPaths:
    - pathPrefix: "/etc/cni/net.d"
    - pathPrefix: "/etc/kube-flannel"
    - pathPrefix: "/run/flannel"
  readOnlyRootFilesystem: false
  # Users and groups
  runAsUser:
    rule: RunAsAny
  supplementalGroups:
    rule: RunAsAny
  fsGroup:
    rule: RunAsAny
  # Privilege Escalation
  allowPrivilegeEscalation: false
  defaultAllowPrivilegeEscalation: false
  # Capabilities
  allowedCapabilities: ['NET_ADMIN']
  defaultAddCapabilities: []
  requiredDropCapabilities: []
  # Host namespaces
  hostPID: false
  hostIPC: false
  hostNetwork: true
  hostPorts:
  - min: 0
    max: 65535
  # SELinux
  seLinux:
    # SELinux is unsed in CaaSP
    rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: flannel
rules:
  - apiGroups: ['extensions']
    resources: ['podsecuritypolicies']
    verbs: ['use']
    resourceNames: ['psp.flannel.unprivileged']
  - apiGroups:
      - ""
    resources:
      - pods
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes/status
    verbs:
      - patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: flannel
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: flannel
subjects:
- kind: ServiceAccount
  name: flannel
  namespace: kube-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: flannel
  namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: kube-flannel-cfg
  namespace: kube-system
  labels:
    tier: node
    app: flannel
data:
  cni-conf.json: |
    {
      "cniVersion": "0.2.0",
      "name": "cbr0",
      "plugins": [
        {
          "type": "flannel",
          "delegate": {
            "hairpinMode": true,
            "isDefaultGateway": true
          }
        },
        {
          "type": "portmap",
          "capabilities": {
            "portMappings": true
          }
        }
      ]
    }
  net-conf.json: |
    {
      "Network": "10.244.0.0/16",
      "Backend": {
        "Type": "vxlan"
      }
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: kube-flannel-ds-amd64
  namespace: kube-system
  labels:
    tier: node
    app: flannel
spec:
  selector:
    matchLabels:
      app: flannel
  template:
    metadata:
      labels:
        tier: node
        app: flannel
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: beta.kubernetes.io/os
                    operator: In
                    values:
                      - linux
                  - key: beta.kubernetes.io/arch
                    operator: In
                    values:
                      - amd64
      hostNetwork: true
      tolerations:
      - operator: Exists
        effect: NoSchedule
      serviceAccountName: flannel
      initContainers:
      - name: install-cni
        image: lizhenliang/flannel:v0.11.0-amd64 
        command:
        - cp
        args:
        - -f
        - /etc/kube-flannel/cni-conf.json
        - /etc/cni/net.d/10-flannel.conflist
        volumeMounts:
        - name: cni
          mountPath: /etc/cni/net.d
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      containers:
      - name: kube-flannel
        image: lizhenliang/flannel:v0.11.0-amd64 
        command:
        - /opt/bin/flanneld
        args:
        - --ip-masq
        - --kube-subnet-mgr
        resources:
          requests:
            cpu: "100m"
            memory: "50Mi"
          limits:
            cpu: "100m"
            memory: "50Mi"
        securityContext:
          privileged: false
          capabilities:
             add: ["NET_ADMIN"]
        env:
        - name: POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: POD_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        volumeMounts:
        - name: run
          mountPath: /run/flannel
        - name: flannel-cfg
          mountPath: /etc/kube-flannel/
      volumes:
        - name: run
          hostPath:
            path: /run/flannel
        - name: cni
          hostPath:
            path: /etc/cni/net.d
        - name: flannel-cfg
          configMap:
            name: kube-flannel-cfg

# recommended.yaml
# 做dashboard用的，注意空格的格式。

# 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:
  type: NodePort #新增
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30009 #新增
  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:v2.3.1
          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:v1.0.6
          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: {}




metrics-server可以用来收集集群中的资源使用情况
# 安装git
[root@k8s-master01 ~]# yum install git -y
# 获取metrics-server, 注意使用的版本
[root@k8s-master01 ~]# git clone -b v0.3.6 https://github.com/kubernetes-incubator/metrics-server
# 修改deployment, 注意修改的是镜像和初始化参数
[root@k8s-master01 ~]# cd /root/metrics-server/deploy/1.8+/
[root@k8s-master01 1.8+]# vim metrics-server-deployment.yaml
按图中添加下面选项
hostNetwork: true
image: registry.cn-hangzhou.aliyuncs.com/google_containers/metrics-server-amd64:v0.3.6
args:
- --kubelet-insecure-tls
- --kubelet-preferred-address-types=InternalIP,Hostname,InternalDNS,ExternalDNS,ExternalIP

# 安装metrics-server
[root@k8s-master01 1.8+]# kubectl apply -f ./

# 查看pod运行情况
[root@k8s-master01 1.8+]# kubectl get pod -n kube-system
metrics-server-6b976979db-2xwbj   1/1     Running   0          90s

# 使用kubectl top node 查看资源使用情况
[root@k8s-master01 1.8+]# kubectl top node
NAME           CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%
k8s-master01   289m         14%    1582Mi          54%       
k8s-node01     81m          4%     1195Mi          40%       
k8s-node02     72m          3%     1211Mi          41%  
[root@k8s-master01 1.8+]# kubectl top pod -n kube-system
NAME                              CPU(cores)   MEMORY(bytes)
coredns-6955765f44-7ptsb          3m           9Mi
coredns-6955765f44-vcwr5          3m           8Mi
etcd-master                       14m          145Mi
...
# 至此,metrics-server安装完成