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官方文档利用Kubeadm安装k8s

官方文档利用Kubeadm安装k8s

作者: amdaous | 来源:发表于2019-03-06 13:32 被阅读0次

    一、准备环境

    所有节点操作:

    1.配置好各节点hosts文件
    2.关闭系统防火墙
    3.关闭Selinux
    setenforce 0
    sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
    
    4.关闭swap
    5.在/etc/sysctl.conf中添加以下配置
    cat <<EOF >  /etc/sysctl.d/k8s.conf
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1
    net.ipv4.ip_forward = 1
    EOF
    
    sysctl --system
    
    6.配置yum源
    docker yum源
    cat >> /etc/yum.repos.d/docker.repo <<EOF
    [docker-repo]
    name=Docker Repository
    baseurl=http://mirrors.aliyun.com/docker-engine/yum/repo/main/centos/7
    enabled=1
    gpgcheck=0
    EOF
    
    kubernetes 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
    EOF
    
    yum clean all
    yum makecache
    

    二、安装docker、kubeadm等

    所有节点操作:
    yum install -y docker --disableexcludes=docker-repo
    yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
    systemctl enable docker && systemctl start docker
    systemctl enable kubelet && systemctl start kubelet
    

    三、kubeadm初始化集群

    在master上操作:
    kubeadm init --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16 --kubernetes-version=v1.13.0
    
    输出应如下所示:
    image.png

    注意:请保存输出中的 kubeadm join …………一行命令

    要使kubectl为非root用户工作,请运行以下命令,这些命令也是kubeadm init输出的一部分:
    mkdir -p $HOME/.kube
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config
    
    或者,如果是root用户,则可以运行:
    export KUBECONFIG=/etc/kubernetes/admin.conf
    

    四、安装flannel网络

    在master上操作:
    kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml
    
    执行 kubectl get pod -n kube-system 查看pod状态,等待所有pod处于running状态即可。

    五、添加计算节点

    在计算节点上操作:
    执行第三步中保存的 kubeadm join …………命令
    在master上查看node添加状态:kubectl get nodes

    六、部署dashboard

    在master上操作:
    1.下载yaml文件
    wget
    https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml
    
    2.更改yaml'中的image地址
    将kubernetes-dashboard.yaml中的镜像地址改为
    registry.cn-qingdao.aliyuncs.com/wangxiaoke/kubernetes-dashboard-amd64:v1.10.0
    
    3.安装
    kubectl create -f  kubernetes-dashboard.yaml
    
    查看dashboard的POD是否正常启动,如果正常说明安装成功
    [root@node1 ~]# kubectl get pods --namespace=kube-system
    NAME                                     READY   STATUS    RESTARTS   AGE
    coredns-576cbf47c7-kg8s9                 1/1     Running   0          29h
    coredns-576cbf47c7-st599                 1/1     Running   0          29h
    etcd-node1.ztpt.com                      1/1     Running   0          29h
    kube-apiserver-node1.ztpt.com            1/1     Running   0          29h
    kube-controller-manager-node1.ztpt.com   1/1     Running   1          29h
    kube-flannel-ds-amd64-79x9h              1/1     Running   0          27h
    kube-flannel-ds-amd64-f9fls              1/1     Running   0          26h
    kube-flannel-ds-amd64-q7kvx              1/1     Running   0          29h
    kube-proxy-242zg                         1/1     Running   0          27h
    kube-proxy-5ntm5                         1/1     Running   0          29h
    kube-proxy-6pbrv                         1/1     Running   0          26h
    kube-scheduler-node1.ztpt.com            1/1     Running   1          29h
    kubernetes-dashboard-77fd78f978-wzqjq    1/1     Running   0          5m7s
    
    4、配置外网访问
    修改service配置,将type: ClusterIP改成NodePort
    kubectl edit service  kubernetes-dashboard --namespace=kube-system
    
    查看外网暴露端口
    [root@node1 ~]# kubectl get service --namespace=kube-system
    NAME                   TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)         AGE
    kube-dns               ClusterIP   10.96.0.10       <none>        53/UDP,53/TCP   47h
    kubernetes-dashboard   NodePort    10.101.221.220   <none>        443:32240/TCP   17h
    
    5、创建dashboard admin-token
    创建admin-token.yaml文件,文件内容如下:
    kind: ClusterRoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
      name: admin
      annotations:
        rbac.authorization.kubernetes.io/autoupdate: "true"
    roleRef:
      kind: ClusterRole
      name: cluster-admin
      apiGroup: rbac.authorization.k8s.io
    subjects:
    - kind: ServiceAccount
      name: admin
      namespace: kube-system
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: admin
      namespace: kube-system
      labels:
        kubernetes.io/cluster-service: "true"
        addonmanager.kubernetes.io/mode: Reconcile
    
    创建用户
    kubectl create -f admin-token.yaml 
    
    获取登陆token
    kubectl describe secret/$(kubectl get secret -nkube-system |grep admin|awk '{print $1}') -nkube-system
    
    6.通过浏览器登陆dashboard
    https://节点IP:bashboard暴露端口
    
    认证方式选择口令,输入刚才获取到的token,即可登陆成功。
    进入后就会看到如下界面
    image.png
    image.png

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