kubernetes单节点安装

本文以kubernetes单节点master安装为例，为大家分析kubernetes部署单节点的具体方法。阅读完整文相信大家kubernetes单节点部署有了一定的认识。

服务器角色分配

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

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/kubeletKUBELET_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.configkind: KubeletConfigurationapiVersion: kubelet.config.k8s.io/v1beta1address: ${NODE_ADDRESS}port: 10250readOnlyPort: 10255cgroupDriver: cgroupfsclusterDNS:- ${DNS_SERVER_IP} clusterDomain: cluster.local.failSwapOn: falseauthentication:  anonymous:    enabled: trueEOF

创建kubelet启动脚本

[root@node1 ~]# cat </usr/lib/systemd/system/kubelet.service[Unit]Description=Kubernetes KubeletAfter=docker.serviceRequires=docker.service[Service]EnvironmentFile=/opt/kubernetes/cfg/kubeletExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTSRestart=on-failureKillMode=process[Install]WantedBy=multi-user.targetEOF

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 csrNAME                                                   AGE   REQUESTOR           CONDITIONnode-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 csrNAME                                                   AGE   REQUESTOR           CONDITIONnode-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 nodesNAME        STATUS    AGE       VERSION192.168.142.136   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-proxyKUBE_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 ProxyAfter=network.target[Service]EnvironmentFile=-/opt/kubernetes/cfg/kube-proxyExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTSRestart=on-failure[Install]WantedBy=multi-user.targetEOF

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 proxytcp        0      0 127.0.0.1:10249         0.0.0.0:*               LISTEN      50601/kube-proxytcp6       0      0 :::10256                :::*                    LISTEN      50601/kube-proxy