K8S单master部署四:Kubelet+kube-pro
服务器角色分配
角色 | 地址 | 安装组件 |
---|---|---|
master | 192.168.142.220 | kube-apiserver kube-controller-manager kube-scheduler etcd |
node1 | 192.168.142.136 | kubelet kube-proxy docker flannel etcd |
node2 | 192.168.142.132 | kubelet kube-proxy docker flannel etcd |
一、Kubelet、proxy部署前期准备
分隔符前所有操作均在master进行,后面均为node节点
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移动控制命令
[root@master bin]# pwd
/k8s/kubernetes/server/bin
//node2地址
[root@master bin]# scp -p kubelet kube-proxy root@192.168.142.132:/opt/kubernetes/bin/
//node1地址
[root@master bin]# scp -p kubelet kube-proxy root@192.168.142.136:/opt/kubernetes/bin/
建立引导文件用于引导kubelet自动颁发证书
创建bootstrap.kubeconfig(必须品!!!)
//指定api入口,指自身即可(必须安装了apiserver)
[root@master kubernetes]# export KUBE_APISERVER="https://192.168.142.220:6443"
//设置集群
[root@master kubernetes]# /opt/kubernetes/bin/kubectl config set-cluster kubernetes \
--certificate-authority=/opt/kubernetes/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=/k8s/kubeconfig/bootstrap.kubeconfig
//设置客户端认证
[root@master kubernetes]# /opt/kubernetes/bin/kubectl config set-credentials kubelet-bootstrap \
--token=${BOOTSTRAP_TOKEN} \
--kubeconfig=/k8s/kubeconfig/bootstrap.kubeconfig
//设置上下文参数
[root@master kubernetes]# /opt/kubernetes/bin/kubectl config set-context default \
--cluster=kubernetes \
--user=kubelet-bootstrap \
--kubeconfig=/k8s/kubeconfig/bootstrap.kubeconfig
//设置默认上下文
[root@master kubernetes]# /opt/kubernetes/bin/kubectl config use-context default \
--kubeconfig=/k8s/kubeconfig/bootstrap.kubeconfig
创建kube-proxy kubeconfig文件
//设置集群
[root@master kubernetes]# /opt/kubernetes/bin/kubectl config set-cluster kubernetes \
--certificate-authority=/opt/etcd/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=/k8s/kubeconfig/kube-proxy.kubeconfig
//设置客户端认证
[root@master kubernetes]# /opt/kubernetes/bin/kubectl config set-credentials kube-proxy \
--client-certificate=/opt/kubernetes/ssl/kube-proxy.pem \
--client-key=/opt/kubernetes/ssl/kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=/k8s/kubeconfig/kube-proxy.kubeconfig
//设置上下文参数
[root@master kubernetes]# /opt/kubernetes/bin/kubectl config set-context default \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=/k8s/kubeconfig/kube-proxy.kubeconfig
//设置默认上下文
[root@master kubernetes]# /opt/kubernetes/bin/kubectl config use-context default \
--kubeconfig=/k8s/kubeconfig/kube-proxy.kubeconfig
将kubeconfig文件进行推送
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.142.132:/opt/kubernetes/cfg/
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.142.136:/opt/kubernetes/cfg/
将kubectl写入环境变量
[root@master kubeconfig]# echo "export PATH=\$PATH:/opt/kubernetes/bin/" >> /etc/profile
[root@master kubeconfig]# source /etc/profile
创建bootstrap角色权限用于apiserver请求签名
(重中之重!!!没有基本完蛋)
[root@master kubeconfig]# kubectl create clusterrolebinding kubelet-bootstrap \
--clusterrole=system:node-bootstrapper \
--user=kubelet-bootstrap
node端(所有节点只有地址不同,剩余所有步骤均相同)
安装Kubelet
指定node节点IP和DNS为全局变量(不同的node节点变量需要改变)
不进行变量的设置直接在配置文件进行更改也可。
[root@node1 bin]# export NODE_ADDRESS="192.168.142.136"
[root@node1 bin]# export DNS_SERVER_IP="192.168.142.2"
创建kubelet配置文件
[root@node1 ~]# cat </opt/kubernetes/cfg/kubelet
KUBELET_OPTS="--logtostderr=true \\
--v=4 \\
--hostname-override=${NODE_ADDRESS} \\
--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"
EOF
//这是第二个,有两个!!记住,有两个!!
[root@node1 ~]# cat </opt/kubernetes/cfg/kubelet.config
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: ${NODE_ADDRESS}
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- ${DNS_SERVER_IP}
clusterDomain: cluster.local.
failSwapOn: false
authentication:
anonymous:
enabled: true
EOF
创建kubelet启动脚本
[root@node1 ~]# cat </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
EOF
开启服务
[root@node1 ~]# chmod +x /usr/lib/systemd/system/kubelet.service
[root@node1 ~]# systemctl daemon-reload
[root@node1 ~]# systemctl enable kubelet
[root@node1 ~]# systemctl restart kubelet
此时,如果顺利则会在master收到该node节点发出的请求加入群集的签名请求。下面我们要做的就是进行请求同意。
返回master端检查签名请求
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-rDZDbQ9_NzqUXKMn2Yn28LVkzEXuITrNqPZ9WrJD5qg 42s kubelet-bootstrap Pending
//“pending” 代表等待状态
通过bootstrap角色权限生成kubelet.kubeconfig
证书文件
[root@master kubeconfig]# kubectl certificate approve node-csr-rDZDbQ9_NzqUXKMn2Yn28LVkzEXuITrNqPZ9WrJD5qg
//此时node节点状态会发生变化
[root@master kubeconfig]# kubectl get csr
NAME AGE REQUESTOR CONDITION
node-csr-rDZDbQ9_NzqUXKMn2Yn28LVkzEXuITrNqPZ9WrJD5qg 42s kubelet-bootstrap Approved,Issued
//“Approved” 表示同意请求;“Issued” 表示节点已发布
//查看集群情况
[root@master kubeconfig]# kubectl get nodes
NAME STATUS AGE VERSION
192.168.142.136 Ready 49m v1.6.2
以下步骤均在node节点中进行
安装kube-proxy
建立kube-proxy配置文件
[root@node1 ~]# cat </opt/kubernetes/cfg/kube-proxy
KUBE_PROXY_OPTS="--logtostderr=true \\
--v=4 \\
--hostname-override=192.168.142.136 \\
--cluster-cidr=10.0.0.0/24 \\
--proxy-mode=ipvs \\
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"
EOF
建立kube-proxy启动脚本
[root@node1 ~]# cat </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
[Install]
WantedBy=multi-user.target
EOF
开启服务
[root@node1 ~]# chmod +x /usr/lib/systemd/system/kube-proxy.service
[root@node1 ~]# systemctl daemon-reload
[root@node1 ~]# systemctl enable kube-proxy
[root@node1 ~]# systemctl restart kube-proxy
查看服务启动状况
[root@node2 cfg]# netstat -atnp | grep proxy
tcp 0 0 127.0.0.1:10249 0.0.0.0:* LISTEN 50601/kube-proxy
tcp6 0 0 :::10256 :::* LISTEN 50601/kube-proxy
至此,整个单master集群部署完成!!!!
本文标题:K8S单master部署四:Kubelet+kube-pro
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