环境准备：
序号 ip 系统版本 hostname 配置 节点类型
1 192.168.107.130 CentOS 7.8.2003 (Core) k8s-master 2核2G Master
2 192.168.107.131 CentOS 7.8.2003 (Core) k8s-node01 2核2G node
3 192.168.107.132 CentOS 7.8.2003 (Core) k8s-node02 2核2G node
一、master、node01、node02的准备工作
1.设置hosts
192.168.232.130 k8s-master
192.168.232.131 k8s-node01
192.168.232.132 k8s-node02
2.关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
systemctl status firewalld
2.关闭并禁用SELinux 若当前启用了 SELinux 则需要临时设置其当前状态为 permissive
setenforce 0
编辑／etc/sysconfig selinux 文件，以彻底禁用 SELinux
sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config
查看selinux状态
getenforce
3.配置国内yum源
可以参考这篇去进行配置
https://xiaojin21cen.blog.csdn.net/article/details/84726193?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param
4.安装docker
1）卸载旧版本
sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
2)安装需要的软件包
sudo yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
3)使用Docker镜像安装
sudo yum-config-manager \
--add-repo \
https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/centos/docker-ce.repo
4）安装 Docker Engine-Community
sudo yum install docker-ce docker-ce-cli containerd.io
5）启动 Docker
sudo systemctl start docker
6）通过运行 hello-world 映像来验证是否正确安装了 Docker Engine-Community
sudo docker run hello-world
7）添加aliyundocker仓库加速器
tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://fl791z1h.mirror.aliyuncs.com"]
}
EOF
systemctl daemon-reload
systemctl restart docker
systemctl enable docker
5.添加阿里kubernetes源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[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
二、master安装：
1.安装
yum install kubectl kubelet kubeadm
systemctl enable kubelet
2.初始化k8s集群：
kubeadm init --kubernetes-version=1.19.3 \
--apiserver-advertise-address=192.168.107.130 \
--image-repository registry.aliyuncs.com/google_containers \
--service-cidr=10.10.0.0/16 --pod-network-cidr=10.122.0.0/16
POD的网段为: 10.122.0.0/16， api server地址就是master本机IP。
这一步很关键，由于kubeadm 默认从官网k8s.grc.io下载所需镜像，国内无法访问，因此需要通过–image-repository指定阿里云镜像仓库地址。 这一步要耐心等待
3.kubeadm init
完成之后有如下结果
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.107.130:6443 --token 9e23vz.26p8icc30ts0t6tt \
--discovery-token-ca-cert-hash sha256:6d43457f000a472333a220241476936af078aa7169ad30e5841db8bcdcf21f4f
最后的命令需要在node节点中执行，从而加入的k8s集群
依据提示执行如下命令
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
三、node节点安装kubeadm
1.安装kubeadm kubelet
yum -y install kubeadm kubelet
systemctl enable kubelet
2.启动docker
systemctl enable docker && systemctl start docker
3.加入集群
kubeadm join 192.168.107.130:6443 --token 9e23vz.26p8icc30ts0t6tt \
--discovery-token-ca-cert-hash sha256:6d43457f000a472333a220241476936af078aa7169ad30e5841db8bcdcf21f4f
4.安装网络
kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
这里可能会出现连接问题：
The connection to the server localhost:8080 was refused - did you specify the right host or port?
Solution:
将主机的/etc/kubernetes/admin.conf 文件，发给对应的其他“从节点”
scp /etc/kubernetes/admin.conf 192.168.107.131:/etc/kubernetes/
scp /etc/kubernetes/admin.conf 192.168.107.132:/etc/kubernetes/
然后执行下面的命令：
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile
立刻重启：
source ~/.bash_profile
至此安装完毕
