• kubernetes(K8S)集群及Dashboard安装配置


    环境准备

    机器信息

    主机名 操作系统 IP地址
    K8sm-218 Centos 7.5-x86_64 172.17.0.218
    k8s-219 Centos 7.5-x86_64 172.17.0.219
    k8s-220 Centos 7.5-x86_64 172.17.0.220

    关闭防火墙及selinux

    # systemctl stop firewalld
    # systemctl disable firewalld
    # setenforce 0
    

    修改hosts

    172.17.0.218 k8sm-218
    172.17.0.219 k8s-219
    172.17.0.220 k8s-220
    

    增加网络转发

    # cat <<EOF >  /etc/sysctl.d/k8s.conf
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1
    EOF
    # sysctl --system //使配置生效
    

    安装docker

    # wget -O /etc/yum.repos.d/docker-ce.repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
    # yum install docker-ce-18.06.1.ce-3.el7 -y
    # systemctl start docker 
    # systemctl enable docker 
    

    安装kubelet kubeadm kubectl

    # cat <<EOF > /etc/yum.repos.d/kubernetes.repo
    [kubernetes]
    name=Kubernetes
    baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
    enabled=1
    gpgcheck=1
    repo_gpgcheck=1
    gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
    EOF
    # yum install  kubelet-1.13.3 -y
    # yum install kubeadm-1.13.3 -y
    # yum install kubectl-1.13.3 -y
    # systemctl enable kubelet 
    

    初始化master

    操作均在master中执行。

    # kubeadm init --kubernetes-version=v1.13.3 --apiserver-advertise-address=172.17.0.218 --image-repository registry.aliyuncs.com/google_containers  --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12
    

    --kubernetes-version:指定kubeadm版本;
    --pod-network-cidr:指定pod所属网络
    --image-repository 指定下载源
    --service-cidr:指定service网段,负载均衡ip
    --ignore-preflight-errors=Swap/all:忽略 swap/所有 报错

    初始化成功:

     Your Kubernetes master 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
    
    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 machines by running the following on each node
    as root:
    
      kubeadm join 172.17.0.218:6443 --token ai3bxc.zgq33i1sbdybhnci --discovery-token-ca-cert-hash sha256:20cb9ccc07e2612bc3b31bd7b5e8909bdbd3d293e7c7f4c18dbee6f62ea94788
    

    增加kubectl权限访问:

    # 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网络组件

    # kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
    

    查看镜像状态

    # kubectl get pods -n kube-system
    NAME                               READY   STATUS    RESTARTS   AGE
    coredns-78d4cf999f-5hcjm           1/1     Running   0          29m
    coredns-78d4cf999f-6mlql           1/1     Running   0          29m
    etcd-k8sm-218                      1/1     Running   0          29m
    kube-apiserver-k8sm-218            1/1     Running   0          28m
    kube-controller-manager-k8sm-218   1/1     Running   0          29m
    kube-flannel-ds-amd64-6kfhg        1/1     Running   0          22m
    kube-proxy-b4txb                   1/1     Running   0          29m
    kube-scheduler-k8sm-218            1/1     Running   0          28m
    

    查看node状态

    # kubectl get node
    NAME       STATUS   ROLES    AGE   VERSION
    k8sm-218   Ready    master   32m   v1.13.3
    # kubectl get cs
    NAME                 STATUS    MESSAGE              ERROR
    controller-manager   Healthy   ok                   
    scheduler            Healthy   ok                   
    etcd-0               Healthy   {"health": "true"}   
    

    增加node到集群里

    操作在node中执行。

    // master初始化后的命令
    # kubeadm join 172.17.0.218:6443 --token ai3bxc.zgq33i1sbdybhnci --discovery-token-ca-cert-hash sha256:20cb9ccc07e2612bc3b31bd7b5e8909bdbd3d293e7c7f4c18dbee6f62ea94788
    

    master节点查看node状态

    # kubectl get node
    NAME       STATUS   ROLES    AGE    VERSION
    k8s-219    Ready    <none>   112m   v1.13.3
    k8s-220    Ready    <none>   113m   v1.13.3
    k8sm-218   Ready    master   162m   v1.13.3
    

    测试集群是否正常

    # kubectl create deployment nginx --image=nginx
    deployment.apps/nginx created
    # 创建service
    # kubectl expose deployment nginx --port=80 --type=NodePort
    service/nginx exposed
    # kubectl get pods,svc
    NAME                       READY   STATUS    RESTARTS   AGE
    pod/nginx-5c7588df-hrhfh   1/1     Running   0          2m16s
    
    NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
    service/kubernetes   ClusterIP   10.96.0.1      <none>        443/TCP        3h6m
    service/nginx        NodePort    10.97.240.92   <none>        80:30054/TCP   23s
    

    测试nginx

    通过任意一个nodeip+端口 ,既可以访问到nginx页面

    部署webui dashboard

    下载官方的yaml文件

    # wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.10.1/src/deploy/recommended/kubernetes-dashboard.yaml
    

    修改两个地方
    第一个是修改镜像,kubernetes-dashboard.yaml配置文件112行

     90 # ------------------- Dashboard Deployment ------------------- #
     91 
     92 kind: Deployment
     93 apiVersion: apps/v1
     94 metadata:
     95   labels:
     96     k8s-app: kubernetes-dashboard
     97   name: kubernetes-dashboard
     98   namespace: kube-system
     99 spec:
    100   replicas: 1
    101   revisionHistoryLimit: 10
    102   selector:
    103     matchLabels:
    104       k8s-app: kubernetes-dashboard
    105   template:
    106     metadata:
    107       labels:
    108         k8s-app: kubernetes-dashboard
    109     spec:
    110       containers:
    111       - name: kubernetes-dashboard
    112         #image: k8s.gcr.io/kubernetes-dashboard-amd64:v1.10.1
    113         image: mirrorgooglecontainers/kubernetes-dashboard-amd64:v1.10.0
    114         ports:
    115         - containerPort: 8443
    116           protocol: TCP
    
    

    第二个是添加一个type,指定端口类型为 NodePort,这样外界可以通过地址 nodeIP:nodePort 访问 dashboard,kubernetes-dashboard.yaml配置文件158行

    148 # ------------------- Dashboard Service ------------------- #
    149 
    150 kind: Service
    151 apiVersion: v1
    152 metadata:
    153   labels:
    154     k8s-app: kubernetes-dashboard
    155   name: kubernetes-dashboard
    156   namespace: kube-system
    157 spec:
    158   type: NodePort
    159   ports:
    160     - port: 443
    161       targetPort: 8443
    162   selector:
    163     k8s-app: kubernetes-dashboard
    

    部署到k8s集群

    # kubectl apply -f kubernetes-dashboard.yaml 
    # kubectl get pods -n kube-system |grep dashboard
    kubernetes-dashboard-6685cb584f-xlk2h   1/1     Running   0          98s
    # kubectl get pods,svc -n kube-system
    NAME                                        READY   STATUS    RESTARTS   AGE
    pod/coredns-78d4cf999f-5hcjm                1/1     Running   0          3h21m
    pod/coredns-78d4cf999f-6mlql                1/1     Running   0          3h21m
    pod/etcd-k8sm-218                           1/1     Running   0          3h20m
    pod/kube-apiserver-k8sm-218                 1/1     Running   0          3h19m
    pod/kube-controller-manager-k8sm-218        1/1     Running   0          3h20m
    pod/kube-flannel-ds-amd64-6kfhg             1/1     Running   0          3h13m
    pod/kube-flannel-ds-amd64-c4fr4             1/1     Running   0          152m
    pod/kube-flannel-ds-amd64-qhc2w             1/1     Running   0          151m
    pod/kube-proxy-7hntq                        1/1     Running   0          151m
    pod/kube-proxy-b4txb                        1/1     Running   0          3h21m
    pod/kube-proxy-bz529                        1/1     Running   0          152m
    pod/kube-scheduler-k8sm-218                 1/1     Running   0          3h20m
    pod/kubernetes-dashboard-6685cb584f-xlk2h   1/1     Running   0          3m5s
    
    NAME                           TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)         AGE
    service/kube-dns               ClusterIP   10.96.0.10    <none>        53/UDP,53/TCP   3h21m
    service/kubernetes-dashboard   NodePort    10.104.4.26   <none>        443:31667/TCP   3m5s
    

    通过https访问ui

    Token (令牌) 认证方式

    此操作在master中执行。

    1.授权 (所有 namespace )

    #创建serviceaccount
    [root@master ~]# kubectl create serviceaccount dashboard-serviceaccount -n kube-system
    #创建clusterrolebinding
    # kubectl create clusterrolebinding dashboard-cluster-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-serviceaccount
    

    2.获取令牌(用于网页登录)

    #查看口令列表
    # kubectl get secret -n kube-system |grep dashboard-serviceaccount-token
    dashboard-serviceaccount-token-f45wg             kubernetes.io/service-account-token   3      22s
    #获取口令
    # kubectl describe secret dashboard-serviceaccount-token-f45wg -n kube-system
    

    将获取到的token放在令牌里

    登录成功

    至此,K8S集群+Dashboard搭建成功!

    转载请添加出处:https://www.cnblogs.com/aresxin/p/k8s-install.html

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  • 原文地址:https://www.cnblogs.com/aresxin/p/k8s-install.html
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