单机版K8S安装及部署

虚拟机iso下载
安装完虚拟机后：

一 更新yum云

1. 安装wget yum install wget

    wget --version 查看wget版本
   

2. 配置yum云

   ll /etc/yum.repos.d/  查看yum目录
   cp CentOS-Base.repo CentOS-Base.repo-cp  备份yum目录
   

3. 更新yum到国内镜像

      CentOS5:wget http://mirrors.163.com/.help/CentOS5-Base-163.repo
      CentOS6:wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
      CentOS7:wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
      CentOS8:wget http://mirrors.163.com/.help/CentOS8-Base-163.repo
   

4. 更新yum云

      yum -y update
   

二 安装kubernete

1. 关闭防火墙及其服务

   systemctl disable firewalld
   systemctl stop firewalld
   

2. yum 安装kubernetes etcd

   yum install -y etcd kubernetes etcd 
   

3. 启动kubernetes 服务并查看状态

   systemctl start etcd 
   systemctl status etcd
   systemctl start docker
   systemctl status docker
   systemctl start kube-apiserver
   systemctl status kube-apiserver
   systemctl start kube-controller-manager
   systemctl status kube-controller-manager
   systemctl start kube-scheduler
   systemctl status kube-scheduler
   systemctl start kubelet
   systemctl status kubelet
   systemctl start kube-proxy
   systemctl status kube-proxy
   

4. 配置tomcat

   mkdir /usr/local/k8s
   cd /usr/local/k8s
   

创建mytomcat.rc.yaml

apiVersion: v1
kind: ReplicationController
metadata: 
 name: mytomcat
spec: 
 replicas: 3
 selector:  
  app: mytomcat
 template: 
  metadata: 
   labels: 
    app: mytomcat
  spec: 
    containers: 
     - name: mytomcat
       image: tomcat:7-jre7
       ports: 
       - containerPort: 8080

创建mytomcat.svc.yaml

apiVersion: v1
kind: Service
metadata: 
 name: mytomcat
spec: 
 type: NodePort
 ports: 
  - port: 8080
    nodePort: 30001
 selector: 
   app: mytomcat

1. 创建k8s rc与svc

       kubectl create -f mytomcat.rc.yaml
       kubectl create -f mytomcat.svc.yaml
   

2. 查看k8s pods

       kubectl get pods // 查看失败  vi /etc/kubernetes/apiserver   去掉serviceAccount 
   

访问: http://ip:30001

三 遇到问题处理解决方案

1. docker pull 失败解决方案

      1 yum install *rhsm* -y
      2 docker search pod-infrastructure
      3 docker pull docker.io/tianyebj/pod-infrastructure
      4 docker tag tianyebj/pod-infrastructure 10.0.0.103:5000/pod-infrastructure
      5 docker push 10.0.0.103:5000/pod-infrastructure
       vi /etc/kubernetes/kubelet
       修改 KUBELET_POD_INFRA_CONTAINER="--pod-infra-containerimage=10.0.0.103:5000/pod- infrastructure:latest"
   

2. 重启k8s服务

           systemctl restart kube-apiserver 
           systemctl restart kube-controller-manager 
           systemctl restart kube-scheduler 
           systemctl restart kubelet 
           systemctl restart kube-proxy
   

3. 解决外网无法访问问题

           vi /etc/sysctl.conf
           添加 net.ipv4.ip_forward=1
           进入/usr/local/k8s目录
               执行 kubectl replace -f mytomcat.rc.yaml
                   kubectl delete svc --all
                   kubectl create -f mytomcat.svc.yaml
   

4. Kubernetes nodePort 不可访问的解决方法

           getenforce  查看 selinux, 如果显示 Enforcing，表示开启
           setenforce 0 关闭 selinux
           iptables --flush  
           iptables -tnat --flush  清除 iptables
           iptables -P FORWARD ACCEPT 接受所有来路
           service docker restart 重启 docker，k8s 会重新调度
           kubectl delete pods -all 清理所有pods
           执行 kubectl replace -f mytomcat.rc.yaml
                   kubectl delete svc --all
                   kubectl create -f mytomcat.svc.yaml