kubernetes集群环境搭建(6)

kubernetes集群环境搭建(6)
- 一、kubernetes集群环境搭建
  - 1.1.1 安装部署node节点服务kubelet

一、kubernetes集群环境搭建

1.1.1 安装部署node节点服务kubelet

1 .安装部署kubelet服务主机规划

主机	角色	ip
hdss-21	kubelet	10.0.0.21
hdss-22	kubelet	10.0.0.22

签发kubelet证书（hdss-201）

创建生成证书签名请求（csr）的JSON配置文件
[root@hdss-201.host.com ~]# cd /opt/certs/
[root@hdss-201.host.com /opt/certs]# vim  kubelet-csr.json
[root@hdss-201.host.com /opt/certs]# cat kubelet-csr.json
{
    "CN": "k8s-kubelet",
    "hosts": [
    "127.0.0.1",
    "10.0.0.10",
    "10.0.0.21",
    "10.0.0.22",
    "10.0.0.23",
    "10.0.0.24",
    "10.0.0.25",
    "10.0.0.26",
    "10.0.0.27",
    "10.0.0.28"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "guizjou",
            "L": "guiyang",
            "O": "od",
            "OU": "ops"
        }
    ]
}
#注意：添加node节点IP，多些一些可有能安装使用的IP（预留kubelet 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@hdss-201.host.com /opt/certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssl-json -bare kubelet
2020/06/15 21:13:10 [INFO] generate received request
2020/06/15 21:13:10 [INFO] received CSR
2020/06/15 21:13:10 [INFO] generating key: rsa-2048
2020/06/15 21:13:10 [INFO] encoded CSR
2020/06/15 21:13:10 [INFO] signed certificate with serial number 175022088378942891662316182252757045162962070069
2020/06/15 21:13:10 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@hdss-201.host.com /opt/certs]# ll
total 84
-rw-r--r-- 1 root root 1249 Jun 13 21:35 apiserver.csr
-rw-r--r-- 1 root root  566 Jun 13 21:31 apiserver-csr.json
-rw------- 1 root root 1679 Jun 13 21:35 apiserver-key.pem
-rw-r--r-- 1 root root 1598 Jun 13 21:35 apiserver.pem
-rw-r--r-- 1 root root  840 Jun 12 21:24 ca-config.json
-rw-r--r-- 1 root root  993 Jun 10 21:49 ca.csr
-rw-r--r-- 1 root root  345 Jun 10 21:48 ca-csr.json
-rw------- 1 root root 1675 Jun 10 21:49 ca-key.pem
-rw-r--r-- 1 root root 1346 Jun 10 21:49 ca.pem
-rw-r--r-- 1 root root  993 Jun 13 21:23 client.csr
-rw-r--r-- 1 root root  280 Jun 13 21:22 client-csr.json
-rw------- 1 root root 1675 Jun 13 21:23 client-key.pem
-rw-r--r-- 1 root root 1363 Jun 13 21:23 client.pem
-rw-r--r-- 1 root root 1062 Jun 12 21:33 etcd-peer.csr
-rw-r--r-- 1 root root  363 Jun 12 21:27 etcd-peer-csr.json
-rw------- 1 root root 1679 Jun 12 21:33 etcd-peer-key.pem
-rw-r--r-- 1 root root 1428 Jun 12 21:33 etcd-peer.pem
-rw-r--r-- 1 root root 1115 Jun 15 21:13 kubelet.csr
-rw-r--r-- 1 root root  451 Jun 15 21:13 kubelet-csr.json
-rw------- 1 root root 1675 Jun 15 21:13 kubelet-key.pem
-rw-r--r-- 1 root root 1468 Jun 15 21:13 kubelet.pem

拷贝证书、私钥

#21
[root@hdss-21.host.com /opt/kubernetes/server/bin]# scp -rp hdss-201:/opt/certs/kubelet-key.pem /opt/kubernetes/server/bin/certs/
root@hdss-201's password: 
kubelet-key.pem                                                                                    100% 1675     1.3MB/s   00:00    
[root@hdss-21.host.com /opt/kubernetes/server/bin]# scp -rp hdss-201:/opt/certs/kubelet.pem /opt/kubernetes/server/bin/certs/
root@hdss-201's password: 
kubelet.pem                                                                                        100% 1468     2.0MB/s   00:00    
[root@hdss-21.host.com /opt/kubernetes/server/bin]# ll /opt/kubernetes/server/bin/certs/
total 32
-rw------- 1 root root 1679 Jun 13 21:49 apiserver-key.pem
-rw-r--r-- 1 root root 1598 Jun 13 21:48 apiserver.pem
-rw------- 1 root root 1675 Jun 13 21:47 ca-key.pem
-rw-r--r-- 1 root root 1346 Jun 13 21:46 ca.pem
-rw------- 1 root root 1675 Jun 13 21:48 client-key.pem
-rw-r--r-- 1 root root 1363 Jun 13 21:48 client.pem
-rw------- 1 root root 1675 Jun 15 21:13 kubelet-key.pem
-rw-r--r-- 1 root root 1468 Jun 15 21:13 kubelet.pem
#22操作相同

创建配置文件（分四步）

#21
1、set-cluster
[root@hdss-21.host.com /opt/kubernetes/server/bin]# cd config/
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl config set-cluster myk8s \
>     --certificate-authority=/opt/kubernetes/server/bin/certs/ca.pem \
>     --embed-certs=true \
>     --server=https://10.0.0.10:7443 \
>     --kubeconfig=kubelet.kubeconfig
Cluster "myk8s" set.

2、set-credentials
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# 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.

3、set-context
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl config set-context myk8s-context \
>   --cluster=myk8s \
>   --user=k8s-node \
>   --kubeconfig=kubelet.kubeconfig
Context "myk8s-context" created.

4、use-context
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig
Switched to context "myk8s-context".

创建资源配置文件，授予权限，角色绑定

[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# vi k8s-node.yaml
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# cat 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@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl create -f k8s-node.yaml
clusterrolebinding.rbac.authorization.k8s.io/k8s-node created

[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl get clusterrolebinding k8s-node #检查
NAME       AGE
k8s-node   42s
[root@hdss-21.host.com /opt/kubernetes/server/bin/config]# kubectl get clusterrolebinding k8s-node -o yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  creationTimestamp: "2020-06-15T13:50:20Z"
  name: k8s-node
  resourceVersion: "24418"
  selfLink: /apis/rbac.authorization.k8s.io/v1/clusterrolebindings/k8s-node
  uid: 6a991a6d-b922-4979-a7b2-534c47ff06da
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:node
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: User
  name: k8s-node
  
#注意：这个配置文件创建之后不用在22上重复创建，因为配置引进写到etcd了，重复创建会报错。

#22 从21上拷贝配置文件
[root@hdss-22.host.com /opt/kubernetes/server/bin/config]# scp -rp hdss-21:/opt/kubernetes/server/bin/config/kubelet.kubeconfig ./
The authenticity of host 'hdss-21 (10.0.0.21)' can't be established.
ECDSA key fingerprint is SHA256:bbt9sjPOENs3zK9cw7YmIo0ABuFkZnTxXbOaIdpSOo0.
ECDSA key fingerprint is MD5:e5:3b:15:2e:6c:82:4b:b1:f8:45:dc:80:72:de:11:47.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'hdss-21,10.0.0.21' (ECDSA) to the list of known hosts.
root@hdss-21's password: 
kubelet.kubeconfig                               

[root@hdss-22.host.com /opt/kubernetes/server/bin/config]# ll
total 12
-rw-r--r-- 1 root root 2223 Apr 27 13:49 audit.yaml
-rw------- 1 root root 6195 Jun 15 21:40 kubelet.kubeconfig

准备pause基础镜像(hdss-201) -- 边车模式(初始化容器业务空间)

[root@hdss-201.host.com /opt/certs]# docker pull kubernetes/pause
Using default tag: latest
latest: Pulling from kubernetes/pause
4f4fb700ef54: Pull complete 
b9c8ec465f6b: Pull complete 
Digest: sha256:b31bfb4d0213f254d361e0079deaaebefa4f82ba7aa76ef82e90b4935ad5b105
Status: Downloaded newer image for kubernetes/pause:latest
docker.io/kubernetes/pause:latest

打标签上传harbor私有仓库
[root@hdss-201.host.com /opt/certs]# docker tag f9d5de079539 harbor.od.com/public/pause:latest
[root@hdss-201.host.com /opt/certs]# docker push harbor.od.com/public/pause:latest
The push refers to repository [harbor.od.com/public/pause]
5f70bf18a086: Mounted from public/nginx 
e16a89738269: Pushed 
latest: digest: sha256:b31bfb4d0213f254d361e0079deaaebefa4f82ba7aa76ef82e90b4935ad5b105 size: 938

写启动脚本

#21 
[root@hdss-21.host.com /opt/kubernetes/server/bin]# vim kubelet.sh 
[root@hdss-21.host.com /opt/kubernetes/server/bin]# chmod +x kubelet.sh 
[root@hdss-21.host.com /opt/kubernetes/server/bin]# ll kubelet.sh 
-rwxr-xr-x 1 root root 674 Jun 15 22:31 kubelet.sh
[root@hdss-21.host.com /opt/kubernetes/server/bin]# cat 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 ./certs/ca.pem \
  --tls-cert-file ./certs/kubelet.pem \
  --tls-private-key-file ./cert/kubelet-key.pem \
  --hostname-override hdss-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

创建数据目录和日志目录
[root@hdss-21.host.com /opt/kubernetes/server/bin]# mkdir -p /data/logs/kubernetes/kube-kubelet /data/kubelet
[root@hdss-21.host.com /opt/kubernetes/server/bin]# ll /data/logs/kubernetes/kube-kubelet /data/kubelet
/data/kubelet:
total 0

/data/logs/kubernetes/kube-kubelet:
total 0

#22操作同上

8.supervisor后台管理启动

[root@hdss-21.host.com /opt/kubernetes/server/bin]# vim /etc/supervisord.d/kube-kubelet.ini
[root@hdss-21.host.com /opt/kubernetes/server/bin]# cat /etc/supervisord.d/kube-kubelet.ini
[program:kube-kubelet-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)

[root@hdss-21.host.com /opt/kubernetes/server/bin]# supervisorctl status
etcd-server-21                   RUNNING   pid 1455, uptime 0:00:00
kube-apiserver-21                RUNNING   pid 1452, uptime 0:00:00
kube-controller-manager-21       RUNNING   pid 1224, uptime 0:00:00
kube-kubelet-21                  RUNNING   pid 2053, uptime 0:02:48
kube-scheduler-21                RUNNING   pid 1226, uptime 0:00:00

9.检查是否添加到集群节点

[root@hdss-21.host.com /opt/kubernetes/server/bin]# kubectl get nodes
NAME               STATUS   ROLES    AGE   VERSION
hdss-21.host.com   Ready    <none>   4m    v1.15.2
hdss-22.host.com   Ready    <none>   17m   v1.15.2

ROlES添加标签，设定节点角色，可同时加两个标签
[root@hdss-21.host.com /opt/kubernetes/server/bin]# kubectl label node hdss-21.host.com node-role.kubernetes.io/master=
[root@hdss-21.host.com /opt/kubernetes/server/bin]# kubectl label node hdss-22.host.com node-role.kubernetes.io/master=
node/hdss-22.host.com labeled
[root@hdss-21.host.com /opt/kubernetes/server/bin]# kubectl label node hdss-21.host.com node-role.kubernetes.io/node=
node/hdss-21.host.com labeled
[root@hdss-21.host.com /opt/kubernetes/server/bin]# kubectl label node hdss-22.host.com node-role.kubernetes.io/node=
node/hdss-22.host.com labeled

[root@hdss-21.host.com /opt/kubernetes/server/bin]# kubectl get nodes
NAME               STATUS   ROLES         AGE     VERSION
hdss-21.host.com   Ready    master,node   9m32s   v1.15.2
hdss-22.host.com   Ready    master,node   22m     v1.15.2

#因为这两台服务器即是master又是node所以两个角色都要添加

posted @ 2020-06-16 00:11 海上月阅读(124) 评论(0) 编辑收藏举报

海上月

kubernetes集群环境搭建(6)

kubernetes集群环境搭建(6)

一、kubernetes集群环境搭建

1.1.1 安装部署node节点服务kubelet

公告