##环境配置：
echo 1 > /proc/sys/net/ipv4/ip_forward
sysctl -p /etc/sysctl.conf
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab
cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
修改主机名：
hostnamectl set-hostname c12
添加阿里源
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=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
##使用kubeadmin安装
1、所有节点安装kubeadm，kubelet，kubectl
yum install -y kubelet-1.19.1-0 kubeadm-1.19.1-0 kubectl-1.19.1-0
systemctl enable kubelet && systemctl start kubelet
2、初始化master
kubeadm init --kubernetes-version=1.19.1 --apiserver-advertise-address=192.168.17.129 --image-repository registry.aliyuncs.com/google_containers --service-cidr=10.1.0.0/16 --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=NumCPU
3、配置kubectl工具
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
4、安装网络插件
安装calico：
mkdir k8s
cd k8s
wget https://docs.projectcalico.org/v3.10/getting-started/kubernetes/installation/hosted/kubernetes-datastore/calico-networking/1.7/calico.yaml --no-check-certificate
## 将192.168.0.0/16修改ip地址为10.244.0.0/16
sed -i 's/192.168.0.0/10.244.0.0/g' calico.yaml
加载：kubectl apply -f calico.yaml
或者安装flannel：
wget
https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
5、Node加入集群
登录到node节点，确保已经安装了docker和kubeadm，kubelet，kubectl
kubeadm join 192.168.31.150:6443--token ute1qr.ylhan3tn3eohip20 \
--discovery-token-ca-cert-hash sha256:f7b37ecd602deb59e0ddc2a0cfa842f8c3950690f43a5d552a7cefef37d1fa31
如果token过期，重新生成：
kubeadm token create
生成hash：
openssl x509 -pubkey -in/etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssldgst -sha256 -hex | sed 's/^.* //'
如果失败，查看kubelet日志：
journalctl –u kubelet
###允许master调度
kubectl taint nodes k8s-master node-role.kubernetes.io/master-
###卸载
kubectl delete node --all
kubeadm reset -f
清理主机：
docker volume rm etcd
rm -r /var/etcd/backups/*
modprobe -r ipip
lsmod
rm -rf ~/.kube/
rm -rf /etc/kubernetes/
rm -rf/etc/systemd/system/kubelet.service.d
rm -rf /etc/systemd/system/kubelet.service
rm -rf /usr/bin/kube*
rm -rf /etc/cni
rm -rf /opt/cni
rm -rf /var/lib/etcd
rm -rf /var/lib/kubelet
rm -rf /var/etcd
yum remove kube*
卸载生成的网卡：
ifconfig XX down
ip link del XX
##使用kind安装
kind是把K8S安装到docker中
安装kind：
curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.11.1/kind-linux-amd64
chmod +x ./kind
mv ./kind /usr/bin/kind
安装kubectl
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
kubectl version --client
创建单机K8S集群：
kind create cluster --name myk8s
通过提供配置文件可以创建更复杂的集群
kind create cluster --config config.yaml
```
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
- role: control-plane
- role: control-plane
- role: worker
- role: worker
- role: worker
```
参考：https://kind.sigs.k8s.io/docs/user/quick-start/#installation
##使用K3S安装
K3S是一个精简版的K8S，大部分接口兼容
curl -sfL https://rancher-mirror.rancher.cn/k3s/k3s-install.sh | INSTALL_K3S_MIRROR=cn sh - --docker
运行此安装后：
K3s 服务将被配置为在节点重启后或进程崩溃或被杀死时自动重启。
将安装其他实用程序，包括 kubectl、crictl、ctr、k3s-killall.sh 和 k3s-uninstall.sh。
kubeconfig 文件将写入到 /etc/rancher/k3s/k3s.yaml，由 K3s 安装的 kubectl 将自动使用该文件
https://docs.k3s.io/zh/quick-start
卸载：/usr/local/bin/k3s-uninstall.sh
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