部署目标

• 在所有节点上安装Docker和kubeadm
• 部署Kubernetes Master
• 部署容器网络插件

部署架构

环境准备

• 3台虚拟机CentOS7.x-86_x64
• 硬件配置：2GB或更多RAM，2个CPU或更多CPU，硬盘30GB或更多
• 集群中所有机器之间网络互通
• 可以访问外网，需要拉取镜像
• 禁止swap分区

域名解析

[root@master ~]# vi /etc/hosts
192.168.31.101 master
192.168.31.102 node1
192.168.31.103 node2

设置域名解析服务器

[root@master ~]# vim /etc/resolv.conf
nameserver 114.114.114.114

更换CentOS YUM源为阿里云yum源

# 安装wget（有则不必安装）
yum install wget -y
# 备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
# 获取阿里云yum源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
# 获取阿里云epel源
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
# 清理缓存并创建新的缓存
yum clean all && yum makecache
# 系统更新
yum update -y

时间同步

ntpdate ntp1.aliyun.com

关闭防火墙

[root@master ~]# systemctl stop firewalld
[root@master ~]# systemctl disable firewalld

关闭selinux

setenforce 0
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config

关闭swap分区

swapoff -a
vi /etc/fstab

设置主机名

hostnamectl set-hostname master
hostnamectl set-hostname node1
hostnamectl set-hostname node2

安装docker

# 安装 Docker CE
# 设置仓库
# 安装所需包
yum install -y yum-utils \
    device-mapper-persistent-data \
    lvm2

# 新增 Docker 仓库,速度慢的可以换阿里云的源。
yum-config-manager \
    --add-repo \
    http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

    https://download.docker.com/linux/centos/docker-ce.repo
# 阿里云源地址
# http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

# 安装 Docker CE.
yum install -y containerd.io-1.2.10 \
    docker-ce-19.03.4 \
    docker-ce-cli-19.03.4

# 启动 Docker 并添加开机启动
systemctl start docker
systemctl enable docker

配置docker镜像加速

mkdir /etc/docker

cat > /etc/docker/daemon.json <<EOF
{
  "registry-mirrors": ["https://registry.cn-hangzhou.aliyuncs.com"],
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

mkdir -p /etc/systemd/system/docker.service.d

# Restart docker.
systemctl daemon-reload
systemctl restart docker

配置Docker, K8S的阿里云yum源

[root@master ~]# cat >>/etc/yum.repos.d/kubernetes.repo <<EOF
[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
[root@master ~]# wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
[root@master ~]# yum clean all
[root@master ~]# yum repolist

Master节点安装kubeadm

#安装
yum install -y kubeadm-1.19.2 kubectl-1.19.2  kubelet-1.19.2

# 启动
systemctl enable kubelet && systemctl start kubelet

初始化主节点

kubeadm init --kubernetes-version=1.19.2 \
--apiserver-advertise-address=192.168.31.101 \
--image-repository registry.aliyuncs.com/google_containers \
--service-cidr=10.1.0.0/16 \
--pod-network-cidr=10.244.0.0/16

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


kubeadm join 192.168.31.101:6443 --token z11pq3.jw48bvg0z7hui7um \
    --discovery-token-ca-cert-hash sha256:3b5430a1b458663ec88c0e59f5b3c16d3683809994a7c3f9c2ffd353cc145054

配置环境变量

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

安装flannel网络插件

[root@master software]# kubectl apply -f flannel.yaml
[root@master software]# kubectl get po -n kube-system
NAME                             READY   STATUS    RESTARTS   AGE
coredns-6d56c8448f-7bvbp         1/1     Running   0          10m
coredns-6d56c8448f-jwkb4         1/1     Running   0          10m
etcd-master                      1/1     Running   0          11m
kube-apiserver-master            1/1     Running   0          11m
kube-controller-manager-master   1/1     Running   0          11m
kube-flannel-ds-kqgwb            1/1     Running   0          30s
kube-proxy-nwtsm                 1/1     Running   0          10m
kube-scheduler-master            1/1     Running   0          11m
[root@master software]# kubectl get node
NAME     STATUS   ROLES    AGE   VERSION
master   Ready    master   12m   v1.19.2

安装Node节点

#安装
yum install -y kubeadm-1.19.2 kubectl-1.19.2  kubelet-1.19.2

# 启动
systemctl enable kubelet && systemctl start kubelet


# 主节点生成token
[root@master software]# kubeadm token create --print-join-command
kubeadm join 192.168.31.101:6443 --token bfg2ea.e0oapuae71wuzsbi     --discovery-token-ca-cert-hash sha256:3b5430a1b458663ec88c0e59f5b3c16d3683809994a7c3f9c2ffd353cc145054

# 从节点加入
kubeadm join 192.168.31.101:6443 --token bfg2ea.e0oapuae71wuzsbi     --discovery-token-ca-cert-hash sha256:3b5430a1b458663ec88c0e59f5b3c16d3683809994a7c3f9c2ffd353cc145054

# 将 master 节点的 admin.conf 拷贝到 node1
scp /etc/kubernetes/admin.conf root@node1:/etc/kubernetes/

# 配置 Kubeconfig 环境变量
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile
source ~/.bash_profile

# 安装 flannel 网络插件
kubectl apply -f flannel.yaml

# 查看集群状态在master节点上
kubectl get nodes