k8s部署---node节点组件部署（四）

kubelet组件简介

• kubernetes 是一个分布式的集群管理系统，在每个节点（node）上都要运行一个 worker 对容器进行生命周期的管理，这个 worker 程序就是 kubelet
• kubelet 的主要功能就是定时从某个地方获取节点上 pod/container 的期望状态（运行什么容器、运行的副本数量、网络或者存储如何配置等等），并调用对应的容器平台接口达到这个状态。

kubelet组件特性

• 定时汇报当前节点的状态给 apiserver，以供调度的时候使用
• 镜像和容器的清理工作，保证节点上镜像不会占满磁盘空间，退出的容器不会占用太多资源
• 运行 HTTP Server，对外提供节点和 pod 信息，如果在 debug 模式下，还包括调试信息
• 等等...

kubelet 主要功能

• Pod 管理
• 容器健康检查
• 容器监控

kube-proxy组件介绍

• 在 node节点上实现 Pod网络代理，维护网络规划和四层负载均衡工作

实验部署

实验环境

• Master01:192.168.80.12
• Node01:192.168.80.13
• Node02:192.168.80.14
• 本篇实验部署是接上篇文章master节点部署继续部署，实验环境不变，本篇文章主要是部署node节点中kubelet组件与kube-proxy组件

kubelet组件部署

• master01服务器操作

  [root@master01 k8s]# cd /root/k8s/kubernetes/server/bin     //进入之前解压好的软件命令目录[root@master01 bin]# lsapiextensions-apiserver              kube-apiserver.docker_tag           kube-proxycloud-controller-manager             kube-apiserver.tar                  kube-proxy.docker_tagcloud-controller-manager.docker_tag  kube-controller-manager             kube-proxy.tarcloud-controller-manager.tar         kube-controller-manager.docker_tag  kube-schedulerhyperkube                            kube-controller-manager.tar         kube-scheduler.docker_tagkubeadm                              kubectl                             kube-scheduler.tarkube-apiserver                       kubelet                             mounter[root@master01 bin]# scp kubelet kube-proxy root@192.168.80.13:/opt/kubernetes/bin/   //把 kubelet、 kube-proxy拷贝到node节点上去root@192.168.80.13's password:kubelet                                                                    100%  168MB  91.4MB/s   00:01kube-proxy                                                                 100%   48MB  71.8MB/s   00:00[root@master01 bin]# scp kubelet kube-proxy root@192.168.80.14:/opt/kubernetes/bin/root@192.168.80.14's password:kubelet                                                                    100%  168MB 122.5MB/s   00:01kube-proxy                                                                 100%   48MB  95.2MB/s   00:00[root@master01 bin]# scp /mnt/node.zip root@192.168.80.13:/root     //将宿主机挂载的压缩文件拷贝到node01节点root@192.168.80.13's password:node.zip                                                                   100% 1240     4.1KB/s     00:00

• node01节点操作

  [root@node01 ~]# lsanaconda-ks.cfg  flannel.sh  flannel-v0.10.0-linux-amd64.tar.gz  node.zip  README.md[root@node01 ~]# unzip node.zip        //解压压缩包Archive:  node.zipinflating: proxy.shinflating: kubelet.sh

• master01节点操作

  [root@master01 bin]# cd /root/k8s/[root@master01 k8s]# mkdir kubeconfig          //创建配置文件目录[root@master01 k8s]# cd kubeconfig[root@master01 kubeconfig]# cp /mnt/kubeconfig.sh /root/k8s/kubeconfig/      //拷贝脚本到配置文件目录[root@master01 kubeconfig]# mv kubeconfig.sh kubeconfig                  //更名[root@master01 kubeconfig]# vim kubeconfig              //编辑文件# 创建 TLS Bootstrapping Token#BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ')BOOTSTRAP_TOKEN=0fb61c46f8991b718eb38d27b605b008cat > token.csv <

• node01节点操作

  [root@node01 ~]# ls /opt/kubernetes/cfg/         //检查是否成功拷贝bootstrap.kubeconfig  flanneld  kube-proxy.kubeconfig[root@node01 ~]# bash kubelet.sh 192.168.80.13           //执行脚本文件生成kubelet的配置文件与启动脚本Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.[root@node01 ~]# systemctl status kubelet.service         //查看服务是否启动● kubelet.service - Kubernetes KubeletLoaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)Active: active (running) since 一 2020-02-10 14:17:12 CST; 1min 45s ago      //成功运行Main PID: 79678 (kubelet)Memory: 14.2M...

• master01服务器操作

  [root@master01 kubeconfig]# kubectl get csr              //查看是否有node01节点请求申请证书NAME                                                   AGE     REQUESTOR           CONDITIONnode-csr-WQGufSR06MTCWv0Neu0AexyqBZ1UgFDM1qdSziNEq_w   3m16s   kubelet-bootstrap   Pending[root@master01 kubeconfig]# kubectl certificate approve  node-csr-WQGufSR06MTCWv0Neu0AexyqBZ1UgFDM1qdSziNEq_w            //同意自签node01节点自签请求certificatesigningrequest.certificates.k8s.io/node-csr-WQGufSR06MTCWv0Neu0AexyqBZ1UgFDM1qdSziNEq_w approved[root@master01 kubeconfig]# kubectl get csr          //同意后再次查看请求状态NAME                                                   AGE     REQUESTOR           CONDITIONnode-csr-WQGufSR06MTCWv0Neu0AexyqBZ1UgFDM1qdSziNEq_w   4m40s   kubelet-bootstrap   Approved,Issued   //已经被允许加入群集[root@master01 kubeconfig]# kubectl get node      //查看群集节点，成功加入node01节点NAME            STATUS   ROLES    AGE   VERSION192.168.80.13   Ready       78s   v1.12.3

• node01节点操作

  [root@node01 ~]# bash proxy.sh 192.168.80.13     //执行脚本文件，启动kube-proxy服务并生成配置文件Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/ systemd/system/kube-proxy.service.[root@node01 ~]# systemctl status kube-proxy.service     //查看服务是否启动● kube-proxy.service - Kubernetes ProxyLoaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled)Active: active (running) since 一 2020-02-10 14:23:59 CST; 1min 2s ago   //成功启动Main PID: 80889 (kube-proxy)...[root@node01 ~]# scp -r /opt/kubernetes/ root@192.168.80.14:/opt/    //把现成的/opt/kubernetes目录复制到node02节点进行修改即可The authenticity of host '192.168.80.14 (192.168.80.14)' can't be established.ECDSA key fingerprint is SHA256:Ih0NpZxfLb+MOEFW8B+ZsQ5R8Il2Sx8dlNov632cFlo.ECDSA key fingerprint is MD5:a9:ee:e5:cc:40:c7:9e:24:5b:c1:cd:c1:7b:31:42:0f.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.80.14' (ECDSA) to the list of known hosts.root@192.168.80.14's password:flanneld                                                                   100%  235   139.5KB/s   00:00bootstrap.kubeconfig                                                       100% 2167     4.6MB/s   00:00kube-proxy.kubeconfig                                                      100% 6269    14.2MB/s   00:00kubelet                                                                    100%  377   430.7KB/s   00:00kubelet.config                                                             100%  267   262.3KB/s   00:00kubelet.kubeconfig                                                         100% 2296     3.3MB/s   00:00kube-proxy                                                                 100%  189   299.2KB/s   00:00mk-docker-opts.sh                                                          100% 2139     2.3MB/s   00:00scp: /opt//kubernetes/bin/flanneld: Text file busykubelet                                                                    100%  168MB 134.1MB/s   00:01kube-proxy                                                                 100%   48MB 129.8MB/s   00:00kubelet.crt                                                                100% 2185     3.3MB/s   00:00kubelet.key                                                                100% 1675     2.8MB/s   00:00kubelet-client-2020-02-10-14-21-18.pem                                     100% 1273   608.4KB/s   00:00kubelet-client-current.pem                                                 100% 1273   404.9KB/s   00:00[root@node01 ~]# scp /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@192.168.80.14:/usr/lib/systemd/system/          //把kubelet，kube-proxy的service文件拷贝到node2中root@192.168.80.14's password:kubelet.service                                                            100%  264   350.1KB/s   00:00kube-proxy.service                                                         100%  231   341.5KB/s    00:00

• node02上操作

  [root@node02 ~]# cd /opt/kubernetes/ssl/    //进入node01节点拷贝过来的证书目录[root@node02 ssl]# rm -rf *               //删除证书，稍后我们在重新申请证书[root@node02 ssl]# cd ../cfg/              //进入配置文件目录[root@node02 cfg]# vim kubelet            //修改文件KUBELET_OPTS="--logtostderr=true \--v=4 \--hostname-override=192.168.80.14 \        //修改IP地址--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":wq[root@node02 cfg]# vim kubelet.config      //修改配置文件kind: KubeletConfigurationapiVersion: kubelet.config.k8s.io/v1beta1address: 192.168.80.14                       //修改IP地址port: 10250readOnlyPort: 10255cgroupDriver: cgroupfsclusterDNS:- 10.0.0.2clusterDomain: cluster.local.failSwapOn: falseauthentication:anonymous:enabled: true:wq[root@node02 cfg]# vim kube-proxy       //修改kube-proxy配置文件KUBE_PROXY_OPTS="--logtostderr=true \--v=4 \--hostname-override=192.168.80.14 \      //修改IP地址--cluster-cidr=10.0.0.0/24 \--proxy-mode=ipvs \--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig":wq[root@node02 cfg]# systemctl start kubelet.service       //启动服务[root@node02 cfg]# systemctl enable kubelet.service      //设置开机自启Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.[root@node02 cfg]# systemctl start kube-proxy.service     //启动服务[root@node02 cfg]# systemctl enable kube-proxy.service    //设置开机自启Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/ systemd/system/kube-proxy.service.

• master01节点操作

  [root@master01 kubeconfig]# kubectl get csr       //查看node节点请求NAME                                                   AGE     REQUESTOR           CONDITIONnode-csr-WQGufSR06MTCWv0Neu0AexyqBZ1UgFDM1qdSziNEq_w   22m     kubelet-bootstrap   Approved,Issuednode-csr-jUI3h8Ae2tC5OmihpylXEVlMiJnNO117Z1OgpopxAA0   4m54s   kubelet-bootstrap   Pending    //等待集群给该节点颁发证书[root@master01 kubeconfig]# kubectl certificate approve node-csr-jUI3h8Ae2tC5OmihpylXEVlMiJnNO117Z1OgpopxAA0       //使用命令授权许可加入群集certificatesigningrequest.certificates.k8s.io/node-csr-jUI3h8Ae2tC5OmihpylXEVlMiJnNO117Z1OgpopxAA0 approved[root@master01 kubeconfig]# kubectl get csr    //再次查看node节点请求NAME                                                   AGE     REQUESTOR           CONDITIONnode-csr-WQGufSR06MTCWv0Neu0AexyqBZ1UgFDM1qdSziNEq_w   23m     kubelet-bootstrap   Approved,Issuednode-csr-jUI3h8Ae2tC5OmihpylXEVlMiJnNO117Z1OgpopxAA0   5m58s   kubelet-bootstrap   Approved,Issued   //成功加入[root@master01 kubeconfig]# kubectl get node    //查看群集中的节点NAME            STATUS   ROLES    AGE   VERSION192.168.80.13   Ready       20m   v1.12.3192.168.80.14   Ready       76s   v1.12.3   //成功加入节点

  node节点部署完成