安装部署运算节点服务（kubelet）_基于 Kubernetes 的 PaaS

# 签发证书，200机器
200 certs]# vi kubelet-csr.json
{
    "CN": "k8s-kubelet",
    "hosts": [
    "127.0.0.1",
    "10.4.7.10",
    "10.4.7.21",
    "10.4.7.22",
    "10.4.7.23",
    "10.4.7.24",
    "10.4.7.25",
    "10.4.7.26",
    "10.4.7.27",
    "10.4.7.28"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}
200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssl-json -bare kubelet
200 certs]# ll

kubelet-csr-hosts ：把所有可能用到的IP都放进来

# 分发证书，21/22机器
cert]# cd /opt/kubernetes/server/bin/cert/
cert]# scp hdss7-200:/opt/certs/kubelet.pem .
cert]# scp hdss7-200:/opt/certs/kubelet-key.pem .
# 21机器：
cert]# cd ../conf/
conf]# kubectl config set-cluster myk8s \
  --certificate-authority=/opt/kubernetes/server/bin/cert/ca.pem \
  --embed-certs=true \
  --server=https://10.4.7.10:7443 \
  --kubeconfig=kubelet.kubeconfig
conf]# 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 
conf]# kubectl config set-context myk8s-context \
  --cluster=myk8s \
  --user=k8s-node \
  --kubeconfig=kubelet.kubeconfig
conf]# kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig
#out: Switched to context "myk8s-context".
# 做权限授权，推荐文章https://www.jianshu.com/p/9991f189495f
conf]# vi 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
  
conf]# kubectl create -f k8s-node.yaml
conf]# kubectl get clusterrolebinding k8s-node -o yaml
# 22机器，复制21机器即可
cert]# cd ../conf/
conf]# scp hdss7-21:/opt/kubernetes/server/bin/conf/kubelet.kubeconfig .

scp ：用于 Linux 之间复制文件和目录

kubectl create -f ：通过配置文件名或stdin创建一个集群资源对象

kubectl get ... -o ... ：列出Pod以及运行Pod节点信息（你可以试下不加-o和加-o的区别）

# 准备pause基础镜像，200机器：
certs]# docker pull kubernetes/pause
certs]# docker images|grep pause
certs]# docker tag f9d5de079539 harbor.od.com/public/pause:latest
certs]# docker push harbor.od.com/public/pause:latest

docker pull ：下载镜像

docker images ：列出所有的镜像

这里加上|grep 管道符是为了过滤出来pause镜像

docker tag ：给镜像打名字

docker push ：将镜像推送到指定的仓库

# 21/21机器，注意修改主机名，有一处需要改：hdss7-21
bin]# vi /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 hdss7-21.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
  
conf]# cd /opt/kubernetes/server/bin
bin]# mkdir -p /data/logs/kubernetes/kube-kubelet /data/kubelet
bin]# chmod +x kubelet.sh
# 有一处要修改：kube-kubelet-7-21]
bin]# vi /etc/supervisord.d/kube-kubelet.ini
[program:kube-kubelet-7-21]
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)
bin]# supervisorctl update
bin]# supervisorctl status
bin]# kubectl get nodes
# 给标签,21/22都给上master,node
bin]# kubectl label node hdss7-21.host.com node-role.kubernetes.io/master=
bin]# kubectl label node hdss7-21.host.com node-role.kubernetes.io/node=
bin]# kubectl label node hdss7-22.host.com node-role.kubernetes.io/master=
bin]# kubectl label node hdss7-22.host.com node-role.kubernetes.io/node=
bin]# kubectl get nodes