【云原生 · Kubernetes】kubeadm创建集群

柔光的暖阳◎ 2024-04-01 13:30 10阅读 0赞

#### 文章目录 ####

*   *  1. 安装kubeadm
     *   *  1.1 基础环境
         *  1.2 安装kubelet、kubeadm、kubectl
     *  2 使用kubeadm引导集群
     *   *  2.1 下载各个机器需要的镜像
         *  2.2初始化主节点
         *  2.3 根据提示继续
         *   *  2.3.1 设置.kube/config
             *  2.3.2 安装网络组件
         *  2.4 加入node节点
         *  2.5 验证集群
         *  2.6 部署dashboard
         *   *  2.6.1 部署
             *  2.6.2 设置访问端口
             *  2.6.3 创建访问账号
             *  2.6.4 令牌访问
             *  2.6.5 界面
             *  2.6.5 界面

--------------------

> 请参照以前Docker安装。先提前为所有机器安装Docker

### 1. 安装kubeadm ###

*  一台兼容的 Linux 主机。Kubernetes 项目为基于 Debian 和 Red Hat 的 Linux 发行版以及一些不提供包管理器的发行版提供通用的指令
 *  每台机器 2 GB 或更多的 RAM （如果少于这个数字将会影响你应用的运行内存)
 *  2 CPU 核或更多
 *  集群中的所有机器的网络彼此均能相互连接(公网和内网都可以)
 *  **设置防火墙放行规则**
 *  节点之中不可以有重复的主机名、MAC 地址或 product\_uuid。请参见[这里][Link 1]了解更多详细信息。
 *  **设置不同hostname**
 *  开启机器上的某些端口。请参见[这里][Link 2] 了解更多详细信息。
 *  **内网互信**
 *  禁用交换分区。为了保证 kubelet 正常工作，你 **必须** 禁用交换分区。
 *  **永久关闭**

#### 1.1 基础环境 ####

所有机器执行以下操作

#各个机器设置自己的域名
    hostnamectl set-hostname xxxx
    
    
    # 将 SELinux 设置为 permissive 模式（相当于将其禁用）
    sudo setenforce 0
    sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
    
    #关闭swap
    swapoff -a  
    sed -ri 's/.*swap.*/#&/' /etc/fstab
    
    #允许 iptables 检查桥接流量
    cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
    br_netfilter
    EOF
    
    cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1
    EOF
    sudo sysctl --system

#### 1.2 安装kubelet、kubeadm、kubectl ####

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
    [kubernetes]
    name=Kubernetes
    baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
    enabled=1
    gpgcheck=0
    repo_gpgcheck=0
    gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
       http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
    exclude=kubelet kubeadm kubectl
    EOF
    
    
    sudo yum install -y kubelet-1.20.9 kubeadm-1.20.9 kubectl-1.20.9 --disableexcludes=kubernetes
    
    sudo systemctl enable --now kubelet

kubelet 现在每隔几秒就会重启，因为它陷入了一个等待 kubeadm 指令的死循环

### 2 使用kubeadm引导集群 ###

#### 2.1 下载各个机器需要的镜像 ####

sudo tee ./images.sh <<-'EOF'
    #!/bin/bash
    images=(
    kube-apiserver:v1.20.9
    kube-proxy:v1.20.9
    kube-controller-manager:v1.20.9
    kube-scheduler:v1.20.9
    coredns:1.7.0
    etcd:3.4.13-0
    pause:3.2
    )
    for imageName in ${images[@]} ; do
    docker pull registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/$imageName
    done
    EOF
       
    chmod +x ./images.sh && ./images.sh

#### 2.2初始化主节点 ####

#所有机器添加master域名映射，以下需要修改为自己的
    echo "172.31.0.4  cluster-endpoint" >> /etc/hosts
    
    
    
    #主节点初始化
    kubeadm init \
    --apiserver-advertise-address=172.31.0.4 \
    --control-plane-endpoint=cluster-endpoint \
    --image-repository registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images \
    --kubernetes-version v1.20.9 \
    --service-cidr=10.96.0.0/16 \
    --pod-network-cidr=192.168.0.0/16
    
    #所有网络范围不重叠

Your Kubernetes control-plane has initialized successfully!
    
    To start using your cluster, you need to run the following as a regular user:
    
      mkdir -p $HOME/.kube
      sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
      sudo chown $(id -u):$(id -g) $HOME/.kube/config
    
    Alternatively, if you are the root user, you can run:
    
      export KUBECONFIG=/etc/kubernetes/admin.conf
    
    You should now deploy a pod network to the cluster.
    Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
      https://kubernetes.io/docs/concepts/cluster-administration/addons/
    
    You can now join any number of control-plane nodes by copying certificate authorities
    and service account keys on each node and then running the following as root:
    
      kubeadm join cluster-endpoint:6443 --token hums8f.vyx71prsg74ofce7 \
        --discovery-token-ca-cert-hash sha256:a394d059dd51d68bb007a532a037d0a477131480ae95f75840c461e85e2c6ae3 \
        --control-plane 
    
    Then you can join any number of worker nodes by running the following on each as root:
    
    kubeadm join cluster-endpoint:6443 --token hums8f.vyx71prsg74ofce7 \
        --discovery-token-ca-cert-hash sha256:a394d059dd51d68bb007a532a037d0a477131480ae95f75840c461e85e2c6ae3

#查看集群所有节点
    kubectl get nodes
    
    #根据配置文件，给集群创建资源
    kubectl apply -f xxxx.yaml
    
    #查看集群部署了哪些应用？
    docker ps   ===   kubectl get pods -A
    # 运行中的应用在docker里面叫容器，在k8s里面叫Pod
    kubectl get pods -A

#### 2.3 根据提示继续 ####

master成功后提示如下：

![image-20221022211923372][]

##### 2.3.1 设置.kube/config #####

复制上面命令

##### 2.3.2 安装网络组件 #####

[calico官网][calico]

curl https://docs.projectcalico.org/manifests/calico.yaml -O
    
    kubectl apply -f calico.yaml

#### 2.4 加入node节点 ####

kubeadm join cluster-endpoint:6443 --token x5g4uy.wpjjdbgra92s25pp \
    	--discovery-token-ca-cert-hash sha256:6255797916eaee52bf9dda9429db616fcd828436708345a308f4b917d3457a22

新令牌

kubeadm token create --print-join-command

**高可用部署方式，也是在这一步的时候，使用添加主节点的命令即可**

#### 2.5 验证集群 ####

*  验证集群节点状态
 *   *  kubectl get nodes

#### 2.6 部署dashboard ####

##### 2.6.1 部署 #####

kubernetes官方提供的可视化界面

https://github.com/kubernetes/dashboard

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.3.1/aio/deploy/recommended.yaml

# 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:v2.3.1
              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: {
        }

##### 2.6.2 设置访问端口 #####

kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard

type: ClusterIP 改为 type: NodePort

kubectl get svc -A |grep kubernetes-dashboard
    ## 找到端口，在安全组放行

访问： https://集群任意IP:端口 https://139.198.165.238:32759

##### 2.6.3 创建访问账号 #####

#创建访问账号，准备一个yaml文件； vi dash.yaml
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: admin-user
      namespace: kubernetes-dashboard
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    metadata:
      name: admin-user
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: cluster-admin
    subjects:
    - kind: ServiceAccount
      name: admin-user
      namespace: kubernetes-dashboard
    kubectl apply -f dash.yaml

##### 2.6.4 令牌访问 #####

#获取访问令牌
    kubectl -n kubernetes-dashboard get secret 
    $(kubectl -n kubernetes-dashboard get sa/admin-user -o jsonpath=
    "{.secrets[0].name}") -o go-template="{
        {.data.token | base64decode}}"

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    RmQ1FMZU9rRUJ3VXRnM3MifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2Nvd
    W50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJ
    lcm5ldGVzLWRhc2hib2FyZCIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc
    2VjcmV0Lm5hbWUiOiJhZG1pbi11c2VyLXRva2VuLXgyczhmIiwia3ViZXJuZXRlcy5
    pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImFkbWluLXVzZ
    XIiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC5
    1aWQiOiIzOTZmYjdlNS0wMjA2LTQxMjctOGQzYS0xMzRlODVmYjU0MDAiLCJzdWIiO
    iJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZXJuZXRlcy1kYXNoYm9hcmQ6YWRtaW4
    tdXNlciJ9.Hf5mhl35_R0iBfBW7fF198h_klEnN6pRKfk_roAzOtAN-
    Aq21E4804PUhe9Rr9e_uFzLfoFDXacjJrHCuhiML8lpHIfJLK_vSD2pZNaYc2NWZq2
    Mso-
    BMGpObxGA23hW0nLQ5gCxlnxIAcyE76aYTAB6U8PxpvtVdgUknBVrwXG8UC_D8kHm9
    PTwa9jgbZfSYAfhOHWmZxNYo7CF2sHH-
    AT_WmIE8xLmB7J11vDzaunv92xoUoI0ju7OBA2WRr61bOmSd8WJgLCDcyBblxz4Wa-
    3zghfKlp0Rgb8l56AAI7ML_snF59X6JqaCuAcCJjIu0FUTS5DuyIObEeXY-z-Rw

##### 2.6.5 界面 #####

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    GVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiIzOTZmYjd
    lNS0wMjA2LTQxMjctOGQzYS0xMzRlODVmYjU0MDAiLCJzdWIiOiJzeXN0ZW06c2Vyd
    mljZWFjY291bnQ6a3ViZXJuZXRlcy1kYXNoYm9hcmQ6YWRtaW4tdXNlciJ9.Hf5mhl
    35_R0iBfBW7fF198h_klEnN6pRKfk_roAzOtAN-
    Aq21E4804PUhe9Rr9e_uFzLfoFDXacjJrHCuhiML8lpHIfJLK_vSD2pZNaYc2NWZq2
    Mso-
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    PTwa9jgbZfSYAfhOHWmZxNYo7CF2sHH-
    AT_WmIE8xLmB7J11vDzaunv92xoUoI0ju7OBA2WRr61bOmSd8WJgLCDcyBblxz4Wa-
    3zghfKlp0Rgb8l56AAI7ML_snF59X6JqaCuAcCJjIu0FUTS5DuyIObEeXY-z-Rw

##### 2.6.5 界面 #####

![image-20221022215805081][]

[Link 1]: https://kubernetes.io/zh/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#verify-mac-address
[Link 2]: https://kubernetes.io/zh/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#check-required-ports
[image-20221022211923372]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/9f8af44f121f4a3c9866f4a664056b32.png
[calico]: https://docs.projectcalico.org/getting-started/kubernetes/self-managed-onprem/onpremises#install-calico-with-kubernetes-api-datastore-more-than-50-nodes
[image-20221022215805081]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/1d421b7c4ae24eadadede41cea41f2f8.png