K8S(八)——部署运算节点服务-kube-kubelet

部署kubelet

在10.4.7.21和10.4.7.22主机上

一、签发证书（在harbor主机，10.4.7.200）

• 创建生成证书的json文件

cd /opt/certs/
vim 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": "ShangHai",
            "L": "ShangHai",
            "O": "xy",
            "OU": "ops"
        }
    ]
}

• 生成证书文件

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssl-json -bare kubelet

二、将证书拷贝至10.4.7.21和10.4.7.22主机，创建配置文件

1.拷贝证书(两台都)

cd /opt/kubernetes/server/bin/cert/
scp sx7-200:/opt/certs/kubelet.pem .
scp sx7-200:/opt/certs/kubelet-key.pem .

2.创建配置文件（在一台创建，最后拷贝到另一台即可）

cd /opt/kubernetes/server/bin/conf

　<1>set-cluster

[root@sx7-21 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

<2>set-credentials

[root@sx7-21 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

<3>set-context

[root@sx7-21 conf]# kubectl config set-context myk8s-context 
--cluster=myk8s 
--user=k8s-node 
--kubeconfig=kubelet.kubeconfig

<4>use-context

[root@sx7-21 conf]# kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig

<5>k8s-node.yaml

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

b.应用资源配置

kubectl create -f k8s-node.yaml

c.查看集群角色和角色属性
kubectl get clusterrolebinding k8s-node 
kubectl get clusterrolebinding k8s-node -o yaml

拷贝配置文件到10.4.7.22主机

[root@sx7-22 conf]# scp sx7-21:/opt/kubernetes/server/bin/conf/kubelet.kubeconfig .

三、准备pause镜像（在10.4.7.200主机）

1.下载镜像

docker pull kubernetes/pause

2.标记镜像

docker images | grep pause
docker tag f9d5de079539 harbor.xyly.com/public/pause:latest

3.上传到Harbor仓库

docker push harbor.xyly.com/public/pause:latest

查看仓库的镜像

四、启动kubelet服务(10.4.7.11，10.4.7.12主机)

1.创建启动脚本

vi /opt/kubernetes/server/bin/kubelet.sh        //部署其他节点修改红色字体

#!/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 sx7-21.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.xyly.com/public/pause:latest              // 修改为自己的harbor仓库地址
  --root-dir /data/kubelet

修改脚本权限并创建目录

chmod +x /opt/kubernetes/server/bin/kubelet.sh 
mkdir -p /data/logs/kubernetes/kube-kubelet   /data/kubelet

2.创建supervisor配置

vim /etc/supervisord.d/kube-kubelet.ini                // 另一台主机修改红色字体

[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)

启动服务

supervisorctl  update
supervisorctl status  // 查看状态

 

 

3.检查节点情况，打标签

kubectl get nodes

 

给节点打标签
kubectl label node sx7-21.host.com node-role.kubernetes.io/master=
kubectl label node sx7-21.host.com node-role.kubernetes.io/node=

kubectl label node sx7-22.host.com node-role.kubernetes.io/master=
kubectl label node sx7-22.host.com node-role.kubernetes.io/node=