云计算
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]# ls
apiextensions-apiserver kube-apiserver.docker_tag kube-proxy
cloud-controller-manager kube-apiserver.tar kube-proxy.docker_tag
cloud-controller-manager.docker_tag kube-controller-manager kube-proxy.tar
cloud-controller-manager.tar kube-controller-manager.docker_tag kube-scheduler
hyperkube kube-controller-manager.tar kube-scheduler.docker_tag
kubeadm kubectl kube-scheduler.tar
kube-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 00:01
kube-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 00:01
kube-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 00:00node01节点操作
[root@node01 ~]# ls
anaconda-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.zip
inflating: proxy.sh
inflating: kubelet.shmaster01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=0fb61c46f8991b718eb38d27b605b008
cat > token.csv <<EOF
${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,system:kubelet-bootstrap
EOF
//删除此部分内容
...
:wq
[root@master01 kubeconfig]# cat /opt/kubernetes/cfg/token.csv //查看token文件获取序列号即可
c37758077defd4033bfe95a071689272,kubelet-bootstrap,10001,system:kubelet-bootstrap
[root@master01 kubeconfig]# vim kubeconfig
...
# 设置客户端认证参数
kubectl config set-credentials kubelet-bootstrap \\
--token=c37758077defd4033bfe95a071689272 \\ //修改为tokenID 将变量更改为获取的序列号
--kubeconfig=bootstrap.kubeconfig
...
:wq
[root@master01 kubeconfig]# vim /etc/profile //编辑文件设置环境变量
...
export PATH=$PATH:/opt/kubernetes/bin/
:wq
[root@master01 kubeconfig]# source /etc/profile //重新执行文件
[root@master01 kubeconfig]# kubectl get cs //查看群集状态，确认群集正常
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {health:true}
etcd-1 Healthy {health:true}
etcd-2 Healthy {health:true}
[root@master01 kubeconfig]# bash kubeconfig 192.168.80.12 /root/k8s/k8s-cert/ //使用命令生成配置文件
Cluster kubernetes set.
User kubelet-bootstrap set.
Context default created.
Switched to context default.
Cluster kubernetes set.
User kube-proxy set.
Context default created.
Switched to context default.
[root@master01 kubeconfig]# ls
bootstrap.kubeconfig kubeconfig kube-proxy.kubeconfig //生成两个配置文件
[root@master01 kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.80.13:/opt/kubernetes/cfg/ //将生成的配置文件拷贝到node节点中
root@192.168.80.13\'s password:
bootstrap.kubeconfig 100% 2167 1.1MB/s 00:00
kube-proxy.kubeconfig 100% 6269 7.1MB/s 00:00
[root@master01 kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.80.14:/opt/kubernetes/cfg/
root@192.168.80.14\'s password:
bootstrap.kubeconfig 100% 2167 1.6MB/s 00:00
kube-proxy.kubeconfig 100% 6269 4.5MB/s 00:00
[root@master01 kubeconfig]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap //创建bootstrap角色赋予权限用于连接apiserver请求签名（关键点）
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap creatednode01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 Kubelet
Loaded: 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 CONDITION
node-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 CONDITION
node-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 VERSION
192.168.80.13 Ready <none> 78s v1.12.3node01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 Proxy
Loaded: 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)? yes
Warning: 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 00:00
bootstrap.kubeconfig 100% 2167 4.6MB/s 00:00
kube-proxy.kubeconfig 100% 6269 14.2MB/s 00:00
kubelet 100% 377 430.7KB/s 00:00
kubelet.config 100% 267 262.3KB/s 00:00
kubelet.kubeconfig 100% 2296 3.3MB/s 00:00
kube-proxy 100% 189 299.2KB/s 00:00
mk-docker-opts.sh 100% 2139 2.3MB/s 00:00
scp: /opt//kubernetes/bin/flanneld: Text file busy
kubelet 100% 168MB 134.1MB/s 00:01
kube-proxy 100% 48MB 129.8MB/s 00:00
kubelet.crt 100% 2185 3.3MB/s 00:00
kubelet.key 100% 1675 2.8MB/s 00:00
kubelet-client-2020-02-10-14-21-18.pem 100% 1273 608.4KB/s 00:00
kubelet-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 00:00
kube-proxy.service 100% 231 341.5KB/s 00:00node02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: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 192.168.80.14 //修改IP地址
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterdns:
- 10.0.0.2
clusterDomain: cluster.local.
failSwapOn: false
authentication:
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 CONDITION
node-csr-WQGufSR06MTCWv0Neu0AexyqBZ1UgFDM1qdSziNEq_w 22m kubelet-bootstrap Approved,Issued
node-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 CONDITION
node-csr-WQGufSR06MTCWv0Neu0AexyqBZ1UgFDM1qdSziNEq_w 23m kubelet-bootstrap Approved,Issued
node-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 VERSION
192.168.80.13 Ready <none> 20m v1.12.3
192.168.80.14 Ready <none> 76s v1.12.3 //成功加入节点node节点部署完成
