一、部署kubectl服务
1、工作流程图
2、Kubelet组件运行在Node节点上，维持运行中的Pods以及提供kuberntes运行时环境，主要完成以下使命：
１）监视分配给该Node节点的pods
２）挂载pod所需要的volumes
３）下载pod的secret
４）通过docker/rkt来运行pod中的容器
５）周期的执行pod中为容器定义的liveness探针
６）上报pod的状态给系统的其他组件
７）上报Node的状态
kubelet安装在node节点，我们的node跟apiserver在一起，这里安装在hdss7-21,22上：
首先，kubernetes依赖pause，我们先将此服务上传到们自己的docker私有仓库：
kubernetes中的pause容器主要为每个业务容器提供以下功能：
在pod中担任Linux命名空间共享的基础；
启用pid命名空间，开启init进程。
3、签发证书
vim /opt/certs/kubelet-csr.json { "CN": "k8s-kubelet", "hosts": [ "127.0.0.1", "192.168.112.10", "192.168.112.22", "192.168.112.23", "192.168.112.24", "192.168.112.25" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "L": "BeiJing", "ST": "BeiJing", "O": "od", "OU": "ops" } ] } cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssl-json -bare kubelet
4、拷贝配置文件(22、23)
cd /opt/kubernetes/server/bin/cert/ scp operations:/opt/certs/kubelet.pem ./ scp operations:/opt/certs/kubelet-key.pem ./
5、分发证书(22、23)
# 设置集群参数 kubectl config set-cluster myk8s --certificate-authority=/opt/kubernetes/server/bin/cert/ca.pem --embed-certs=true --server=https://192.168.112.10:7443 --kubeconfig=kubelet.kubeconfig # 设置客户端认证参数 kubectl config set-credentials k8s-node --client-certificate=/opt/kubernetes/server/bin/cert/client.pem --client-key=/opt/kubernetes/server/bin/cert/client-key.pem --embed-certs=true --kubeconfig=kubelet.kubeconfig # 设置上下文参数 kubectl config set-context myk8s-context --cluster=myk8s --user=k8s-node --kubeconfig=kubelet.kubeconfig # 设置当前使用的上下文 kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig
cd /opt/kubernetes/server/bin/conf
scp operations:/opt/certs/kubelet.kubeconfig ./
6、创建k8s-node.yaml文件（22节点上：不论在哪个节点创建，已经同步到etcd上。）
vim k8s-node.yaml apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: k8s-node roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: system:node subjects: - apiGroup: rbac.authorization.k8s.io kind: User name: k8s-node 创建 kubectl create -f k8s-node.yaml 检测 kubectl get clusterrolebinding k8s-node -o yaml
7、在运维主机上
docker pull kubernetes/pause docker tag f9d5de079539 harbor.od.com/public/pause:latest docker push harbor.od.com/public/pause:latest
8、编辑kubelet启动脚本
vim /opt/kubernetes/server/bin/kubelet.sh #!/bin/sh ./kubelet --anonymous-auth=false --cgroup-driver systemd --cluster-dns 192.168.0.2 --cluster-domain cluster.local --runtime-cgroups=/systemd/system.slice --kubelet-cgroups=/systemd/system.slice --fail-swap-on="false" --client-ca-file ./cert/ca.pem --tls-cert-file ./cert/kubelet.pem --tls-private-key-file ./cert/kubelet-key.pem --hostname-override slave3.host.com --image-gc-high-threshold 20 --image-gc-low-threshold 10 --kubeconfig ./conf/kubelet.kubeconfig --log-dir /data/logs/kubernetes/kube-kubelet --pod-infra-container-image harbor.od.com/public/pause:latest --root-dir /data/kubelet
chmod u+x /opt/kubernetes/server/bin/kubelet.sh
创建日志存储目录： mkdir -p /data/logs/kubernetes/kube-kubelet
9、编辑supervisord启动文件：红色部分自行修改
vi /etc/supervisord.d/kube-kubelet.ini [program:kube-kubelet-7-62] command=/opt/kubernetes/server/bin/kubelet.sh ; the program (relative uses PATH, can take args) numprocs=1 ; number of processes copies to start (def 1) directory=/opt/kubernetes/server/bin ; directory to cwd to before exec (def no cwd) autostart=true ; start at supervisord start (default: true) autorestart=true ; retstart at unexpected quit (default: true) startsecs=30 ; number of secs prog must stay running (def. 1) startretries=3 ; max # of serial start failures (default 3) exitcodes=0,2 ; 'expected' exit codes for process (default 0,2) stopsignal=QUIT ; signal used to kill process (default TERM) stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10) user=root ; setuid to this UNIX account to run the program redirect_stderr=true ; redirect proc stderr to stdout (default false) stdout_logfile=/data/logs/kubernetes/kube-kubelet/kubelet.stdout.log ; stderr log path, NONE for none; default AUTO stdout_logfile_maxbytes=64MB ; max # logfile bytes b4 rotation (default 50MB) stdout_logfile_backups=4 ; # of stdout logfile backups (default 10) stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0) stdout_events_enabled=false ; emit events on stdout writes (default false) supervisorctl update supervisorctl status
10、查看节点是否加到集群
kubectl get nodes NAME STATUS ROLES AGE VERSION slave3.host.com Ready <none> 101s v1.15.2 slave4.host.com Ready <none> 29s v1.15.2 kubectl label node slave3.host.com node-role.kubernetes.io/master= kubectl label node slave3.host.com node-role.kubernetes.io/node= kubectl label node slave4.host.com node-role.kubernetes.io/master= kubectl label node slave4.host.com node-role.kubernetes.io/node= kubectl get nodes
