centos7 kubeadm安装k8s:1.15.1(单节点)

冷不防 2021-10-19 15:44 273阅读 0赞

测试机：使master节点同时作为node节点

<table> 
 <thead> 
  <tr> 
   <th align="left">角色</th> 
   <th>ip</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">master/node</td> 
   <td>192.168.56.201</td> 
  </tr> 
 </tbody> 
</table>

注：master节点加入/退出node中：

＃master加入node
    kubectl taint node master主机名 node-role.kubernetes.io/master-
    
    #master退出node
    kubectl taint node master主机名 node-role.kubernetes.io/master="":NoSchedule

# 1,拉取k8s:1.15.1的7个镜像 #

docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.1
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.1
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.1
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.1
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1
    ################
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.1 k8s.gcr.io/kube-apiserver:v1.15.1
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.1 k8s.gcr.io/kube-controller-manager:v1.15.1
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.1 k8s.gcr.io/kube-scheduler:v1.15.1
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.1 k8s.gcr.io/kube-proxy:v1.15.1
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1

# 2,安装docker #

[https://blog.csdn.net/eyeofeagle/article/details/85015303][https_blog.csdn.net_eyeofeagle_article_details_85015303]  
配置docker运行参数：修改Cgroup Driver类型：

cat  > /etc/docker/daemon.json  <<EOF
    {
      "registry-mirrors": ["https://yywkvob3.mirror.aliyuncs.com"],
      "exec-opts": ["native.cgroupdriver=systemd"]
    }
    EOF
    
    #重启docker
    systemctl  daemon-reload
    systemctl  restart docker

# 3, 安装k8s软件包 #

#1,配置环境
    service firewalld stop
    setenforce 0
    swapoff -a
    
    cat >> /etc/sysctl.conf <<EOF
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1
    net.ipv4.ip_forward = 1
    EOF
    modprobe br_netfilter 
    sysctl -p
    
    #2, 配置yum源
    cat  >/etc/yum.repo.d/k8s.repo <<EOF
    [kubernetes]
    name=kubernetes Repo
    baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
    gpgcheck=1
    gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
    enabled=1
    EOF
    
    #3,安装k8s
    yum -y  install  wget kubelet kubeadm kubectl
    systemctl enable kubelet
    
    cat  > /etc/sysconfig/kubelet  <<EOF
    KUBELET_EXTRA_ARGS="--node-ip=192.168.56.201"
    EOF
    systemctl start kubelet
    
    #4, 配置flannel网络
    wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
    kubectl apply -f kube-flannel.yml
    
    #5,初始化k8s集群
     kubeadm init --kubernetes-version=1.15.1  --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.56.201 --ignore-preflight-errors=NumCPU
     
    #6,配置k8s环境变量
    mkdir -p $HOME/.kube
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config
    
    #7, 查看结果
    [root@docker k8s]# kubectl get nodes --all-namespaces
    NAME     STATUS   ROLES    AGE    VERSION
    docker   Ready    master   125m   v1.15.2

# 4, 验证结果 #

获取mysql.yaml配置，使用k8s运行mysql:[https://www.cnblogs.com/zoulixiang/p/9910337.html][https_www.cnblogs.com_zoulixiang_p_9910337.html]

[root@docker k8s]# kubectl get nodes
    NAME     STATUS   ROLES    AGE    VERSION
    docker   Ready    master   102m   v1.15.2
    
    [root@docker k8s]# kubectl get pods
    NAME                     READY   STATUS    RESTARTS   AGE
    mysql-rc-vpczb           1/1     Running   0          67m
    nginx-7c45b84548-wblkc   1/1     Running   0          86m
    
    [root@docker k8s]# kubectl get svc
    NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
    kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP          105m
    mysql-svc    NodePort    10.110.110.209   <none>        3306:30060/TCP   67m
    nginx        NodePort    10.107.239.151   <none>        80:30569/TCP     78m
    
    [root@docker k8s]# wget docker:30569
    --2019-08-13 17:48:26--  http://docker:30569/
    正在解析主机 docker (docker)... 192.168.56.201
    正在连接 docker (docker)|192.168.56.201|:30569... 已连接。
    已发出 HTTP 请求，正在等待回应... 200 OK
    长度：612 [text/html]
    正在保存至: “index.html”
    100%[===================================>] 612         --.-K/s 用时 0.001s  
    2019-08-13 17:48:26 (1.13 MB/s) - 已保存 “index.html” [612/612])
    
    [root@docker k8s]# kubectl exec -it  svc/mysql-svc  bash
    root@mysql-rc-vpczb:/# mysql -uroot -p123456
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 3
    Server version: 5.5.62 MySQL Community Server (GPL)
    Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.
    Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
    mysql> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | mysql              |
    | performance_schema |
    +--------------------+
    3 rows in set (0.00 sec)

# 5, 安装dashboard #

wget https://raw.githubusercontent.com/kubernetes/dashboard/v1.5.1/src/deploy/kubernetes-dashboard.yaml
    #修改image: registry.cn-hangzhou.aliyuncs.com/google_containers/kubernetes-dashboard-amd64:v1.10.0
    
    #应用配置
    kubectl create -f kubernetes-dashboard.yaml
    #[root@docker ui]# kubectl get pod -A -o wide |grep dash
    #kube-system   kubernetes-dashboard-7d46676dcb-2zrs7   1/1     Running   0          10m     10.244.1.9       docker    <none>           <none>
    #[root@docker ~]# kubectl get svc -A -o wide |grep dash
    #kube-system   kubernetes-dashboard   NodePort    10.1.39.194    <none>        443:30389/TCP            6h24m   k8s-app=kubernetes-dashboard
    
    #创建登陆账户
    kubectl create serviceaccount dashboard-admin -n kube-system
    kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
    #浏览器访问 https://IP:30389, 输入登陆密钥：
    kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')

[https_blog.csdn.net_eyeofeagle_article_details_85015303]: https://blog.csdn.net/eyeofeagle/article/details/85015303
[https_www.cnblogs.com_zoulixiang_p_9910337.html]: https://www.cnblogs.com/zoulixiang/p/9910337.html