7 部署kubelete

NAME STATUS ROLES AGE VERSION

6 部署kubelet

部署Node节点服务

部署kubelet
集群规划
主机名						角色				ip
rstx-203.rongbiz.cn		    kubelet				192.168.1.203
rstx-204.rongbiz.cn			kubelet				192.168.1.204

注意：这里部署文档以rstx-203.host.com主机为例，另外一台计算节点安装部署方法类似

安装其他节点，需要先拷贝
HDSS7-122上:
[root@rstx-203 cert]# cd /opt/kubernetes/server/bin/conf
[root@hdss7-122 conf]# scp rstx-203:/opt/kubernetes/server/bin/conf/kubelet.kubeconfig .

签发kubelet证书
运维主机 rstx-53.rongbiz.cn

创建生成证书签名请求（csr）的JSON配置文件

[root@rstx-53 etc]# cd /opt/certs/
[root@rstx-53 certs]# vi kubelet-csr.json
{
    "CN": "k8s-kubelet",
    "hosts": [
    "127.0.0.1",
    "192.168.1.200",
    "192.168.1.201",
    "192.168.1.202",
    "192.168.1.203",
    "192.168.1.204",
    "192.168.1.205"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}


# 添加node节点IP，多些一些可有能安装使用的IP，如果新node的ip不在证书内，需要重新编写证书，拷贝至所有主机

生成证书
[root@rstx-53 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssl-json -bare kubelet

[root@rstx-53 certs]# ll
-rw-r--r-- 1 root root 1115 12月 11 16:16 kubelet.csr
-rw-r--r-- 1 root root  498 12月 11 16:16 kubelet-csr.json
-rw------- 1 root root 1679 12月 11 16:16 kubelet-key.pem
-rw-r--r-- 1 root root 1468 12月 11 16:16 kubelet.pem

拷贝证书、私钥，注意私钥文件属性600，拷贝至：/opt/kubernetes/server/bin/cert/

[root@rstx-203 ~]# cd /opt/kubernetes/server/bin/certs/
root@rstx-203 cert]# scp rstx4-53:/opt/certs/kubelet.pem .
[root@rstx-203 cert]# scp rstx4-53:/opt/certs/kubelet-key.pem .

注意：后面的点代表当前目录

----------
set-context		-- 只做一次，最后生成的 kubelet.kubeconfig 拷贝至其他节点
注意：在conf目录下

[root@rstx-203 cert]# cd /opt/kubernetes/server/bin/conf
# IP地址提前改好再粘贴复制IP为keeplive的VIP地址
[root@rstx-203 conf]# kubectl config set-cluster myk8s 
    --certificate-authority=/opt/kubernetes/server/bin/certs/ca.pem 
    --embed-certs=true 
    --server=https://192.168.1.200:7443 
    --kubeconfig=kubelet.kubeconfig

Cluster "myk8s" set.

----------

[root@rstx-203 conf]# 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 

User "k8s-node" set.

----------

[root@rstx-203 conf]# kubectl config set-context myk8s-context 
  --cluster=myk8s 
  --user=k8s-node 
  --kubeconfig=kubelet.kubeconfig

Context "myk8s-context" created.

----------
[root@rstx-203 conf]# kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig

Switched to context "myk8s-context".

----------

授予权限，角色绑定	-- 只创建一次就好，存到etcd里,然后拷贝到各个node节点上
[root@rstx-203 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

[root@rstx-203 conf]# kubectl create -f k8s-node.yaml
clusterrolebinding.rbac.authorization.k8s.io/k8s-node created

[root@rstx-203 conf]# kubectl get clusterrolebinding k8s-node -o yaml

----------

rstx-204上:
[root@rstx-204 cert]# cd /opt/kubernetes/server/bin/conf
[root@rstx-204 conf]# scp rstx4-203:/opt/kubernetes/server/bin/conf/kubelet.kubeconfig .


----------

准备pause基础镜像	-- 边车模式
运维主机rstx-53.rongbiz.cn上：

[root@rstx-53 ~]# docker pull kubernetes/pause
[root@rstx-53 ~]# docker tag f9d5de079539 harbor.rongbiz.cn/public/pause:latest
[root@rstx-53 ~]# docker push harbor.rongbiz.cn/public/pause:latest


----------

编写启动脚本 -- # 更改主机名
[root@rstx-203 conf]# vi /opt/kubernetes/server/bin/kubelet.sh
#!/bin/sh
./kubelet 
  --anonymous-auth=false 
  --cgroup-driver systemd 
  --cluster-dns 10.254.0.2 
  --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 rstx-203.rongbiz.cn 
  --kubeconfig ./conf/kubelet.kubeconfig 
  --log-dir /data/logs/kubernetes/kube-kubelet 
  --pod-infra-container-image harbor.rongbiz.cn/public/pause:latest 
  --root-dir /data/kubelet

[root@rstx-203 conf]# mkdir -p /data/logs/kubernetes/kube-kubelet /data/kubelet

[root@rstx-203 conf]# chmod +x /opt/kubernetes/server/bin/kubelet.sh


----------

[root@rstx-203 conf]# vi /etc/supervisord.d/kube-kubelet.ini
[program:kube-kubelet-203]	
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)
killasgroup=true
stopasgroup=true

[root@hdss7-122 conf]# supervisorctl update

[root@hdss7-21 conf]# supervisorctl status
etcd-server-7-121                 RUNNING   pid 6565, uptime 0:24:15
kube-apiserver-7-121              RUNNING   pid 6566, uptime 0:24:15
kube-controller-manager-7-121     RUNNING   pid 6551, uptime 0:24:15
kube-kubelet-203                RUNNING   pid 16663, uptime 0:01:14
kube-scheduler-7-121              RUNNING   pid 6552, uptime 0:24:15

[root@rstx-203 cert]# kubectl get nodes
NAME                STATUS   ROLES    AGE     VERSION
hdss7-21.host.com   Ready    <none>   15h     v1.15.2
hdss7-22.host.com   Ready    <none>   8m51s   v1.15.2

# ROlES添加标签，设定节点角色，可同时加两个标签
[root@rstx-203 cert]# kubectl label node rstx-204.rongbiz.cn node-role.kubernetes.io/master=
[root@rstx-203 cert]# kubectl label node rstx-204.rongbiz.cn node-role.kubernetes.io/node=

[root@hdss7-122 ~]# kubectl get nodes                               
NAME                  STATUS   ROLES         AGE     VERSION
rstx-203.rongbiz.cn   Ready    master,node   33m     v1.15.4
rstx-204.rongbiz.cn   Ready    master,node   2m38s   v1.15.4
rstx-205.rongbiz.cn   Ready    node          4m6s    v1.15.4