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hostPath类型则是映射node文件系统中的文件或者目录到pod里。在使用hostPath类型的存储卷时，也可以设置type字段，支持的类型有文件、目录、File、Socket、CharDevice和BlockDevice。
hostPath类似于docker -v参数，将宿主主机中的文件挂载pod中，但是hostPath比docker -v参数更强大，（Pod调度到哪个节点，则直接挂载到当前节点上）
应用实例：
[root@k8s-master1 hostPath]# cat hostPath-2.yaml
kind: Deployment
apiVersion: apps/v1
metadata:
name: hostpath
namespace: app
spec:
selector:
matchLabels:
app: hostpath
template:
metadata:
labels:
app: hostpath
spec:
containers:
- name: nginx
image: nginx
volumeMounts:
- mountPath: /root # 本地必须存在的目录
name: hostpath-name
volumes:
- name: hostpath-name
hostPath:
path: /root # 随机在node节点创建
type: DirectoryOrCreate # 类型：没有就创建，有就不创建
[root@k8s-master1 hostPath]# kubectl apply -f hostPath-2.yaml
deployment.apps/hostpath created
[root@k8s-master1 hostPath]# kubectl get pods -n app -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
hostpath-6857454677-ldntx 0/1 ContainerCreating 0 7s k8s-node1
nginx 1/1 Running 0 124m 10.10.135.202 k8s-master3
with-affinity-anti-affinity 1/1 Running 0 38m 10.10.135.205 k8s-master3
#查看容器root目录下的文件和该node节点上宿主机的文件一致，完成文件的映射
[root@k8s-master1 hostPath]# kubectl exec -it hostpath-6857454677-ldntx -n app sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
# cd /root
#
#
# ls -ltr
total 941012
-rw-------. 1 root root 1260 Oct 13 18:52 anaconda-ks.cfg
-rw-r--r--. 1 root root 383673856 Oct 17 17:27 calico_img.tar
-rw-r--r-- 1 root root 49820672 Oct 18 12:44 coredns.tar
drwxr-xr-x 3 root root 53 Nov 18 14:47 python3
-rw-r--r-- 1 root root 2116242 Nov 18 15:22 psutil-master.zip
drwxr-xr-x 3 root root 67 Nov 18 15:22 test
-rw------- 1 root root 527973888 Nov 24 07:32 zookeeper.tar
drwxr-xr-x 3 root root 40 Nov 28 13:22 charts
drwxr-xr-x 4 root root 93 Nov 28 13:25 mychart
drwxr-xr-x 4 root root 93 Nov 28 13:32 tomcat-mychart
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