DevOps技术

# 一、基础准备

首先参照 [Kubernetes----安装部署NFS服务器](http://blog.redrose2100.com/article/286) 在master节点搭建nfs服务器

然后在node节点执行如下命令安装nfs-utils工具包，注意node节点不需要启动nfs，安装工具包只是为了能驱动nfs
```bash
yum install -y nfs-utils
```

# 二、NFS实例演示
编辑nfs.yaml文件，内容如下：
```yaml
apiVersion: v1
kind: Namespace
metadata:
  name: dev

---

apiVersion: v1
kind: Pod
metadata:
  name: volume-nfs
  namespace: dev
spec:
  containers:
  - name: nginx
    image: nginx:1.17.1
    ports:
    - containerPort: 80
    volumeMounts:
    - name: logs-volume
      mountPath: /var/log/nginx
  - name: busybox
    image: busybox:1.30
    command: ["/bin/sh","-c","tail -f /logs/access.log"]
    volumeMounts:
    - name: logs-volume
      mountPath: /logs
  volumes:
  - name: logs-volume
    nfs:
      server: 192.168.16.40
      path: /root/data/nfs
```
使用如下命令创建资源
```bash
[root@master Volume]# kubectl apply -f nfs.yaml
namespace/dev created
pod/volume-nfs created
[root@master Volume]#
```
使用如下命令查看创建的资源
```bash
[root@master Volume]# kubectl get pod -n dev -o wide
NAME         READY   STATUS    RESTARTS   AGE   IP             NODE    NOMINATED NODE   READINESS GATES
volume-nfs   2/2     Running   0          13s   10.244.1.249   node1   <none>           <none>
[root@master Volume]#
```
查看master节点即nfs共享目录下，发现此时已经有日志文件了，只不过此时日志文件内容为空
```bash
[root@master Volume]# ls /root/data/nfs/
access.log  error.log
[root@master Volume]#
```
然后使用如下命令在master节点检测nfs共享目录下日志文件的内容变化
```bash
 tail -f /root/data/nfs/access.log
```
然后在node节点使用如下命令请求三次nginx服务
```bash
curl 10.244.1.249:80
```
可以看到此时master节点nfs共享目录下日志文件的变化如下：
```bash
[root@master Volume]# tail -f /root/data/nfs/access.log
10.244.1.1 - - [07/Apr/2022:16:00:24 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.29.0" "-"
10.244.1.1 - - [07/Apr/2022:16:02:06 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.29.0" "-"
10.244.1.1 - - [07/Apr/2022:16:02:07 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.29.0" "-"
```
使用如下命令删除pod
```bash
[root@master Volume]# kubectl delete -f nfs.yaml
namespace "dev" deleted
pod "volume-nfs" deleted
[root@master Volume]#
```
当然此时日志仍然是存在的
```bash
[root@master Volume]# cat /root/data/nfs/access.log
10.244.1.1 - - [07/Apr/2022:16:00:24 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.29.0" "-"
10.244.1.1 - - [07/Apr/2022:16:02:06 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.29.0" "-"
10.244.1.1 - - [07/Apr/2022:16:02:07 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.29.0" "-"
[root@master Volume]#
```

不积跬步，无以至千里

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