k8s安装Node节点之部署kubelet（三）

操作机器

• hdss7-21
• hdss7-22

2、创建生成kubelet服务端证书csr的json配置文件
在hdss7-200.host.com上操作

cd /opt/certs/
cat > kubelet-csr.json <<'eof'
{
    "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"
        }
    ]
}
eof

3、生成拷贝kubelet证书文件

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssljson -bare kubelet
ll kubelet*
-rw-r--r--. 1 root root 1115 9月  20 19:24 kubelet.csr
-rw-r--r--. 1 root root  452 9月  20 19:24 kubelet-csr.json
-rw-------. 1 root root 1675 9月  20 19:24 kubelet-key.pem
-rw-r--r--. 1 root root 1472 9月  20 19:24 kubelet.pem
scp kubelet-key.pem kubelet.pem hdss7-21:/opt/kubernetes/server/bin/certs/
scp kubelet-key.pem kubelet.pem hdss7-22:/opt/kubernetes/server/bin/certs/

4.下载pause镜像打tab
kubelet利用pause镜像给容器建UTS\NET\IPC登录后复制

docker pull kubernetes/pause
docker images | grep pause
kubernetes/pause                latest              f9d5de079539        6 years ago         240kB
docker tag f9d5de079539 harbor.od.com/public/pause:latest
docker login harbor.od.com   # 用户名admin,密码Harbor12345
docker push harbor.od.com/public/pause:latest

5、创建kubeconfig配置
在hdss7-21.host.com上操作,只需要执行一遍，不需要到hdss7-22执行，可以复制生成好的文件
5.1 set-cluster

cd /opt/kubernetes/server/bin/conf
kubectl config set-cluster myk8s \
--certificate-authority=/opt/kubernetes/server/bin/certs/ca.pem \
--embed-certs=true \
--server=https://10.4.7.10:7443 \
--kubeconfig=kubelet.kubeconfig

5.2 set-credentials

kubectl config set-credentials k8s-node \
--client-certificate=/opt/kubernetes/server/bin/certs/client.pem \
--client-key=/opt/kubernetes/server/bin/certs/client-key.pem \
--embed-certs=true \
--kubeconfig=kubelet.kubeconfig

5.3 set-context

kubectl config set-context myk8s-context \
--cluster=myk8s \
--user=k8s-node \
--kubeconfig=kubelet.kubeconfig

5.4 use-context

kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig
ll
总用量 12
-rw-r--r--. 1 root root 2223 9月  20 03:01 audit.yaml
-rw-------. 1 root root 6231 9月  20 19:51 kubelet.kubeconfig

6、拷贝配置到hdss7-22

scp kubelet.kubeconfig hdss7-22:/opt/kubernetes/server/bin/conf/

7、创建资源配置文件

cat > k8s-node.yaml <<'eof'
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
eof

8、应用查看资源配置

kubectl create -f k8s-node.yaml
kubectl get clusterrolebinding k8s-node
kubectl get clusterrolebinding k8s-node -o yaml

9、创建kubelet启动脚本
以hdss7-21操作为例，hdss7-22操作类似
配置不同地方 –hostname-override

cat > /opt/kubernetes/server/bin/kubelet.sh <<'eof'
#!/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 ./certs/ca.pem \
  --tls-cert-file ./certs/kubelet.pem \
  --tls-private-key-file ./certs/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
eof
chmod +x /opt/kubernetes/server/bin/kubelet.sh 
mkdir -p /data/logs/kubernetes/kube-kubelet /data/kubelet

10、创建supervisor配置

cat > /etc/supervisord.d/kube-kubelet.ini <<'eof'
[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)
eof

配置不同地方 [program:kube-kubelet-7-21]
11、启动检查打标签

supervisorctl update
supervisorctl status
kubectl get nodes
kubectl label node hdss7-22.host.com node-role.kubernetes.io/node= 
kubectl label node hdss7-21.host.com node-role.kubernetes.io/node=
kubectl label node hdss7-21.host.com node-role.kubernetes.io/master=
kubectl label node hdss7-22.host.com node-role.kubernetes.io/master= 

[root@hdss-7-22 bin]# kubectl get nodes
NAME                STATUS   ROLES         AGE   VERSION
hdss7-21.host.com   Ready    master,node   10h   v1.15.2
hdss7-22.host.com   Ready    master,node   10h   v1.15.2