CentOS7下yum安装Kubernetes

1、节点规划

节点	IP	hostname	硬件
master	192.168.80.136	master	内存2G   CPU：2*1
node1	192.168.80.137	node1	内存2G   CPU：2*1
node2	192.168.80.138	node2	内存2G   CPU：2*1
etcd	192.168.80.139	etcd	内存2G   CPU：2*1

2、系统配置（所有机器）

• 关闭selinux 

• # 临时关闭
  $ setenforce 0  
  # 永久关闭
  $ vim /etc/selinux/config 
  SELINUX=disabled

• 关闭且禁用防火墙

• $ systemctl stop firewalld 
  $ systemctl disable firewalld

• 修改hostname

• vi /ect/hostname
  
  # 四台机器分别修改为 
  master
  node1
  node2
  etcd

• 修改hosts文件

• $ vim /etc/hosts
  
  127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
  ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
  192.168.80.136 master
  192.168.80.137 node1
  192.168.80.138 node2
  192.168.80.139 etcd

• ssh免密登陆

• $ ssh-keygen  # 一路回车默认即可
  $ ssh-copy-id   {其他机器的ip}

• 更新yum

$ yum update

• 安装相关组件

• $ yum install -y etcd kubernetes ntp flannel

3、各节点配置

• etcd服务器

• # 修改配置文件
  $ vim /etc/etcd/etcd.conf 
  ETCD_NAME=default
  ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
  ETCD_LISTEN_CLIENT_URLS="http://localhost:2379,http://192.168.80.139:2379"
  ETCD_ADVERTISE_CLIENT_URLS="http://192.168.80.139:2379"
  
  # 启动服务
  $ systemctl start etcd   
  $ systemctl enable etcd
  
  #检查etcd cluster状态 
  $ etcdctl cluster-health  
  member 8e9e05c52164694d is healthy: got healthy result from http://192.168.80.139:2379
  cluster is healthy
  
  # 设置一个key，下面会用到
  etcdctl set /k8s/network/config '{"Network": "10.255.0.0/16"}'

• master服务器

• #  配置kube-apiserver配置文件
  
  $  vim /etc/kubernetes/config 
  KUBE_LOGTOSTDERR="--logtostderr=true"
  KUBE_LOG_LEVEL="--v=0"
  KUBE_ALLOW_PRIV="--allow-privileged=false"
  KUBE_MASTER="--master=http://192.168.80.136:8080"
  
  $ vim /etc/kubernetes/apiserver
  KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"
  KUBE_ETCD_SERVERS="--etcd-servers=http://192.168.80.139:2379"
  KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
  KUBE_ADMISSION_CONTROL="--admission-control=AlwaysAdmit"
  KUBE_API_ARGS=""
  
  #配置kube-scheduler配置文件
  vim /etc/kubernetes/scheduler 
  KUBE_SCHEDULER_ARGS="--address=0.0.0.0"
  
  # 启动服务
  for SERVICES in  kube-apiserver kube-controller-manager kube-scheduler
  do 
      systemctl start $SERVICES
  

      systemctl enable $SERVICES

  done

• node1节点

• # 配置node1网络
  $ vim /etc/sysconfig/flanneld 
  FLANNEL_ETCD_ENDPOINTS="http://192.168.80.139:2379"
  FLANNEL_ETCD_PREFIX="/k8s/network"
  FLANNEL_OPTIONS="--iface=ens33"   # ens是当前可用上网的网卡名称
  
  # 配置node1 kube-proxy
  $ vim /etc/kubernetes/config 
  KUBE_LOGTOSTDERR="--logtostderr=true"
  KUBE_LOG_LEVEL="--v=0"
  KUBE_ALLOW_PRIV="--allow-privileged=false"
  KUBE_MASTER="--master=http://192.168.80.136:8080"
  
  $ vim /etc/kubernetes/proxy                  
  KUBE_PROXY_ARGS="--bind=address=0.0.0.0"
  
  # 配置node1 kubelet
  $ vim /etc/kubernetes/kubelet 
  KUBELET_ADDRESS="--address=127.0.0.1"
  KUBELET_HOSTNAME="--hostname-override=node1"
  KUBELET_API_SERVER="--api-servers=http://192.168.80.136:8080"
  KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
  KUBELET_ARGS=""
  
  # 启动node1服务
  for SERVICES in flanneld kube-proxy kubelet; do
      systemctl restart $SERVICES
      systemctl enable $SERVICES
      systemctl status $SERVICES 
  done

• node2节点

• # 配置node2网络
  $ vim /etc/sysconfig/flanneld 
  FLANNEL_ETCD_ENDPOINTS="http://192.168.80.139:2379"
  FLANNEL_ETCD_PREFIX="/k8s/network"
  FLANNEL_OPTIONS="--iface=ens33"        
  
  # 配置node2 kube-proxy
  $ vim /etc/kubernetes/config 
  KUBE_LOGTOSTDERR="--logtostderr=true"
  KUBE_LOG_LEVEL="--v=0"
  KUBE_ALLOW_PRIV="--allow-privileged=false"
  KUBE_MASTER="--master=http://192.168.80.136:8080"
  
  $ vim /etc/kubernetes/proxy                  
  KUBE_PROXY_ARGS="--bind-address=0.0.0.0"
  
  # 配置node2 kubelet
  $ vim /etc/kubernetes/kubelet 
  KUBELET_ADDRESS="--address=127.0.0.1"
  KUBELET_HOSTNAME="--hostname-override=node1"
  KUBELET_API_SERVER="--api-servers=http://192.168.80.136:8080"
  KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"
  KUBELET_ARGS=""
  
  # 启动node2服务
  for SERVICES in flanneld kube-proxy kubelet docker; do
      systemctl restart $SERVICES
      systemctl enable $SERVICES
      systemctl status $SERVICES 
  done

4、测试

[root@master ~]# kubectl get nodes
NAME      STATUS    AGE
node1     Ready     55m
node2     Ready     54m

5、参考文章：

https://blog.csdn.net/lic95/article/details/55015284

https://www.kubernetes.org.cn/3096.html