1. 准备环境

16G 4核CPU 主机一台

2. 安装virtual box

3. 安装vagrant

4. Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

Vagrant.require_version ">= 1.6.0"

boxes = [
    {
        :name => "k8s-master",
        :eth1 => "192.168.205.120",
        :mem => "2048",
        :cpu => "2"
    },
    {
        :name => "k8s-node1",
        :eth1 => "192.168.205.121",
        :mem => "2048",
        :cpu => "1"
    },
    {
        :name => "k8s-node2",
        :eth1 => "192.168.205.122",
        :mem => "2048",
        :cpu => "1"
    }

]

Vagrant.configure(2) do |config|

  config.vm.box = "centos/7"
  boxes.each do |opts|
    config.vm.define opts[:name] do |config|
      config.vm.hostname = opts[:name]
      config.vm.provider "vmware_fusion" do |v|
        v.vmx["memsize"] = opts[:mem]
        v.vmx["numvcpus"] = opts[:cpu]
      end
      config.vm.provider "virtualbox" do |v|
        v.customize ["modifyvm", :id, "--memory", opts[:mem]]
        v.customize ["modifyvm", :id, "--cpus", opts[:cpu]]
      end
      config.vm.network :private_network, ip: opts[:eth1]
    end
  end
  config.vm.provision "shell", privileged: true, path: "./setup.sh"
end

4. setup.sh

#/bin/sh

# install some tools
sudo yum install -y vim telnet bind-utils wget


# install docker
#curl -fsSL get.docker.com -o get-docker.sh
#sh get-docker.sh

## 安装docker


# step 1: 安装必要的一些系统工具
sudo yum install -y yum-utils device-mapper-persistent-data lvm2

# Step 2: 添加软件源信息
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sudo yum-config-manager --disable docker-ce-edge
yum-config-manager --disable docker-ce-test

# Step 3: 更新并安装 Docker-CE
sudo yum makecache fast
sudo yum -y install docker-ce

# Step 4: 开启Docker服务
sudo service docker start

# Step 5: 更改cgroup driver
sudo bash -c ' cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2",
  "storage-opts": [
    "overlay2.override_kernel_check=true"
  ]
}
EOF'




if [ ! $(getent group docker) ];
then 
    sudo groupadd docker;
else
    echo "docker user group already exists"
fi

sudo gpasswd -a $USER docker


sudo systemctl  daemon-reload
sudo systemctl restart docker

#rm -rf get-docker.sh

# open password auth for backup if ssh key doesn't work, bydefault, username=vagrant password=vagrant
sudo sed -i 's/PasswordAuthentication no/PasswordAuthentication yes/g' /etc/ssh/sshd_config
sudo systemctl restart sshd

sudo bash -c 'cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
       http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF'

# 也可以尝试国内的源 http://ljchen.net/2018/10/23/%E5%9F%BA%E4%BA%8E%E9%98%BF%E9%87%8C%E4%BA%91%E9%95%9C%E5%83%8F%E7%AB%99%E5%AE%89%E8%A3%85kubernetes/

sudo setenforce 0

# install kubeadm, kubectl, and kubelet.
#sudo yum install -y kubelet kubeadm kubectl

sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
sudo systemctl enable docker && systemctl start docker
sudo systemctl enable kubelet && systemctl start kubelet


sudo bash -c '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'
sudo sysctl --system

sudo systemctl stop firewalld
sudo systemctl disable firewalld
sudo swapoff -a

sudo systemctl enable docker.service
sudo systemctl enable kubelet.service

sudo cat ./pull.sh  
for i in \`kubeadm config images list\`; do   
 imageName=${i#k8s.gcr.io/}  
 sudo docker pull registry.aliyuncs.com/google_containers/$imageName  
 sudo docker tag registry.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName  
 sudo docker rmi registry.aliyuncs.com/google_containers/$imageName  
done;

6. 启动vagrant & vagrant命令

$ vagrant init      # 初始化
$ vagrant up        # 启动虚拟机  
$ vagrant halt      # 关闭虚拟机  
$ vagrant reload    # 重启虚拟机  
$ vagrant ssh       # SSH 至虚拟机  
$ vagrant suspend   # 挂起虚拟机  
$ vagrant resume    # 唤醒虚拟机  
$ vagrant status    # 查看虚拟机运行状态  
$ vagrant destroy   # 销毁当前虚拟机_

vagrant ssh NAME 登录主机

8. 主节点上执行

sudo kubeadm init --pod-network-cidr 172.100.0.0/16 --apiserver-advertise-address 192.168.205.120

mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

安装网络插件

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

9. node节点

sudo kubeadm join 192.168.205.120:6443 --token tte278.145ozal6u6e26ypm --discovery-token-ca-cert-hash sha256:cbb168e0665fe1b14e96a87c2da5dc1eeda04c70932ac1913d989753703277bb