6.3 访问工作节点文件系统上的文件

pod 应该不关心主机的文件系统, 但是系统级的 pod 需要.

6.3.1 介绍 hostPath 卷

hostPath 卷指向节点文件系统上的特定文件或目录.

删除 pod 后主机上的文件保留.

注意数据库 pod 使用卷的方式.

6.3.2 检查使用 hostPath 卷的系统 pod

1. 列出 pod

$ kubectl get pods --namespace kube-system 
NAME                                        READY   STATUS             RESTARTS   AGE
coredns-74ff55c5b-hxsrg                     1/1     Running            5          4d22h
etcd-minikube                               0/1     Running            5          4d22h
ingress-nginx-admission-create-g7vtb        0/1     Completed          0          46h
ingress-nginx-admission-patch-65rxm         0/1     Completed          0          46h
ingress-nginx-controller-65cf89dc4f-7mnlz   0/1     ImagePullBackOff   0          46h
kube-apiserver-minikube                     1/1     Running            5          4d22h
kube-controller-manager-minikube            0/1     Running            5          4d22h
kube-proxy-zctp7                            1/1     Running            5          4d22h
kube-scheduler-minikube                     0/1     Running            5          4d22h
metrics-server-56c4f8c9d6-mxtqq             0/1     ImagePullBackOff   0          4d
storage-provisioner                         1/1     Running            10         4d22h

有错误?

1. 查看使用的卷

$ kubectl describe po etcd-minikube --namespace kube-system
...
Volumes:
  etcd-certs:
    Type:          HostPath (bare host directory volume)
    Path:          /var/lib/minikube/certs/etcd
    HostPathType:  DirectoryOrCreate
  etcd-data:
    Type:          HostPath (bare host directory volume)
    Path:          /var/lib/minikube/etcd
    HostPathType:  DirectoryOrCreate
....