Master apiserver启用TLS认证后，Node节点kubelet组件想要加入集群，必须使用CA签发的有效证书才能与apiserver通信，当Node节点很多时，签署证书是一件很繁琐的事情，因此有了TLS Bootstrapping机制，kubelet会以一个低权限用户自动向apiserver申请证书，kubelet的证书由apiserver动态签署。 认证大致工作流程如图所示：
准备二进制文件
代码语言：javascript复制scp kubelet kube-proxy 192.168.0.125:/opt/kubernetes/bin/
scp kubelet kube-proxy 192.168.0.126:/opt/kubernetes/bin/部署kubelet
创建角色绑定
代码语言：javascript复制kubectl create clusterrolebinding kubelet-bootstrap
--clusterrole=system:node-bootstrapper
--user=kubelet-bootstrap创建 kubelet bootstrapping kubeconfig 文件
代码语言：javascript复制# 设置集群参数
kubectl config set-cluster kubernetes
--certificate-authority=/opt/kubernetes/ssl/ca.pem
--embed-certs=true
--server=https://192.168.0.130:6443
--kubeconfig=bootstrap.kubeconfig
# 设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap
--token=${BOOTSTRAP_TOKEN}
--kubeconfig=bootstrap.kubeconfig
# 设置上下文参数
kubectl config set-context default
--cluster=kubernetes
--user=kubelet-bootstrap
--kubeconfig=bootstrap.kubeconfig
# 设置默认上下文
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig将bootstrap.kubeconfig文件拷贝到node节点
代码语言：javascript复制scp bootstrap.kubeconfig 192.168.0.125:/opt/kubernetes/cfg/
scp bootstrap.kubeconfig 192.168.0.126:/opt/kubernetes/cfg/创建kubelet配置文件
代码语言：javascript复制[root@k8s-node01 ~]# vim /opt/kubernetes/cfg/kubelet
KUBELET_OPTS="--logtostderr=false
--v=4
--log-dir=/opt/kubernetes/log
--hostname-override=192.168.0.125
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig
--config=/opt/kubernetes/cfg/kubelet.config
--cert-dir=/opt/kubernetes/ssl
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"参数说明：
--hostname-override 在集群中显示的主机名 --kubeconfig 指定kubeconfig文件位置，会自动生成 --bootstrap-kubeconfig 指定刚才生成的bootstrap.kubeconfig文件 --cert-dir 颁发证书存放位置 --pod-infra-container-image 管理Pod网络的镜像
其中/opt/kubernetes/cfg/kubelet.config配置文件如下：
代码语言：javascript复制[root@k8s-node01 ~]# vim /opt/kubernetes/cfg/kubelet.config
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address:
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local.
failSwapOn: false
authentication:
anonymous:
enabled: true创建kubelet系统服务
代码语言：javascript复制[root@k8s-node02 ~]# vim /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet
ExecStart=/opt/kubernetes/bin/kubelet $KUBELET_OPTS
Restart=on-failure
KillMode=process
[Install]
WantedBy=multi-user.target启动kubelet
代码语言：javascript复制systemctl daemon-reload
systemctl enable kubelet
systemctl restart kubelet
systemctl status kubelet查看csr请求
代码语言：javascript复制[root@k8s-master1 ~]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-h0XFLgAXsCQvIQdUN5_fHGJbwYJaekO3zzhEK_wDcNY 103s kubelet-bootstrap Pending
node-csr-xECZ6WkPvlSzu9fE4CJQlMjPfCxJlUpidvSuKWOGpZE 90s kubelet-bootstrap Pending批准kubelet 的 TLS 证书请求
代码语言：javascript复制[root@k8s-master1 ~]# kubectl get csr|grep 'Pending' | awk 'NR>0{print $1}'| xargs kubectl certificate approve
certificatesigningrequest.certificates.k8s.io/node-csr-h0XFLgAXsCQvIQdUN5_fHGJbwYJaekO3zzhEK_wDcNY approved
certificatesigningrequest.certificates.k8s.io/node-csr-xECZ6WkPvlSzu9fE4CJQlMjPfCxJlUpidvSuKWOGpZE approved查看node已经加入集群
代码语言：javascript复制[root@k8s-master1 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
192.168.0.125 Ready <none> 68s v1.13.0
192.168.0.126 Ready <none> 69s v1.13.0kube-proxy部署
配置kube-proxy使用LVS
代码语言：javascript复制yum install -y ipvsadm ipset conntrack创建 kube-proxy 证书请求
代码语言：javascript复制[root@k8s-master1 ssl]# vim kube-proxy-csr.json
{
"CN": "system:kube-proxy",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "BeiJing",
"L": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}生成证书
代码语言：javascript复制cfssl gencert -ca=/opt/kubernetes/ssl/ca.pem
-ca-key=/opt/kubernetes/ssl/ca-key.pem
-config=/opt/kubernetes/ssl/ca-config.json
-profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy将证书分发到node节点
代码语言：javascript复制scp kube-proxy*.pem 192.168.0.125:/opt/kubernetes/ssl/
scp kube-proxy*.pem 192.168.0.126:/opt/kubernetes/ssl/创建kube-proxy kubeconfig文件
代码语言：javascript复制kubectl config set-cluster kubernetes
--certificate-authority=/opt/kubernetes/ssl/ca.pem
--embed-certs=true
--server=https://192.168.0.130:6443
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy
--client-certificate=kube-proxy.pem
--client-key=kube-proxy-key.pem
--embed-certs=true
--kubeconfig=kube-proxy.kubeconfig
kubectl config set-context default
--cluster=kubernetes
--user=kube-proxy
--kubeconfig=kube-proxy.kubeconfig
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig分发kubeconfig配置文件
代码语言：javascript复制scp kube-proxy.kubeconfig 192.168.0.125:/opt/kubernetes/cfg/
scp kube-proxy.kubeconfig 192.168.0.126:/opt/kubernetes/cfg/创建kube-proxy配置文件
代码语言：javascript复制[root@k8s-node01 ~]# vim /opt/kubernetes/cfg/kube-proxy
KUBE_PROXY_OPTS="--logtostderr=false
--v=4
--log-dir=/opt/kubernetes/log
--hostname-override=192.168.0.125
--cluster-cidr=10.0.0.0/24
--proxy-mode=ipvs
--ipvs-min-sync-period=5s
--ipvs-sync-period=5s
--ipvs-scheduler=rr
--masquerade-all=true
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"创建kube-proxy系统服务
代码语言：javascript复制[root@k8s-node01 ~]# vim /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Proxy
After=network.target
[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-proxy
ExecStart=/opt/kubernetes/bin/kube-proxy $KUBE_PROXY_OPTS
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target启动kube-proxy
代码语言：javascript复制systemctl daemon-reload
systemctl enable kube-proxy
systemctl restart kube-proxy
systemctl status kube-proxy运行一个测试示例
代码语言：javascript复制kubectl run nginx --image=nginx --replicas=3
kubectl expose deployment nginx --port=88 --target-port=80 --type=NodePort查看pod,service
代码语言：javascript复制[root@k8s-master1 ~]# kubectl get pod,svc -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/nginx-7cdbd8cdc9-g9658 0/1 ImagePullBackOff 0 51s 172.17.84.2 192.168.0.125 <none> <none>
pod/nginx-7cdbd8cdc9-wmh46 0/1 ContainerCreating 0 51s <none> 192.168.0.126 <none> <none>
pod/nginx-7cdbd8cdc9-zwmxd 0/1 ContainerCreating 0 51s <none> 192.168.0.126 <none> <none>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 21h <none>
service/nginx NodePort 10.0.0.171 <none> 88:48652/TCP 48s run=nginx访问部署的nginx
查看访问日志
代码语言：javascript复制[root@k8s-master1 ~]# kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous
[root@k8s-master1 ~]# kubectl logs nginx-7cdbd8cdc9-g9658
172.17.84.1 - - [18/Dec/2018:01:59:43 0000] "GET / HTTP/1.1" 200 612 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36" "-"查看LVS状态
代码语言：javascript复制[root@k8s-node02 ~]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 127.0.0.1:48652 rr
-> 172.17.34.2:80 Masq 1 0 0
-> 172.17.34.3:80 Masq 1 0 0
-> 172.17.84.2:80 Masq 1 0 0
TCP 172.17.34.0:48652 rr
-> 172.17.34.2:80 Masq 1 0 0
-> 172.17.34.3:80 Masq 1 0 0
-> 172.17.84.2:80 Masq 1 0 0
TCP 172.17.34.1:48652 rr
-> 172.17.34.2:80 Masq 1 0 0
-> 172.17.34.3:80 Masq 1 0 0
-> 172.17.84.2:80 Masq 1 0 0
TCP 192.168.0.126:48652 rr
-> 172.17.34.2:80 Masq 1 0 0
-> 172.17.34.3:80 Masq 1 0 0
-> 172.17.84.2:80 Masq 1 0 0
TCP 10.0.0.1:443 rr
-> 192.168.0.123:6443 Masq 1 0 0
-> 192.168.0.124:6443 Masq 1 0 0
TCP 10.0.0.171:88 rr
-> 172.17.34.2:80 Masq 1 0 0
-> 172.17.34.3:80 Masq 1 0 0
-> 172.17.84.2:80 Masq 1 0 0
