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docker - minikube 共享卷在一段时间后不显示文件

问题描述

我必须将本地.ssh目录内容共享给 pod。我搜索帽子并从其中一个帖子中得到答案，以分享开头--mount-string。

$ minikube start --mount-string="$HOME/.ssh/:/ssh-directory" --mount
  minikube v1.9.2 on Darwin 10.14.6
✨  Using the docker driver based on existing profile
  Starting control plane node m01 in cluster minikube
  Pulling base image ...
  Restarting existing docker container for "minikube" ...
  Preparing Kubernetes v1.18.0 on Docker 19.03.2 ...
    ▪ kubeadm.pod-network-cidr=10.244.0.0/16
E0426 23:44:18.447396   80170 kubeadm.go:331] Overriding stale ClientConfig host https://127.0.0.1:32810 with https://127.0.0.1:32813
  Creating mount /Users/myhome/.ssh/:/ssh-directory ...
  Enabling addons: default-storageclass, storage-provisioner
  Done! kubectl is now configured to use "minikube"

❗  /usr/local/bin/kubectl is v1.15.5, which may be incompatible with Kubernetes v1.18.0.
  You can also use 'minikube kubectl -- get pods' to invoke a matching version

当我检查给定 Minikube 的 docker 时，它返回

$ docker ps
CONTAINER ID        IMAGE                                COMMAND                  CREATED             STATUS              PORTS                                                                           NAMES
5ad64f642b63        gcr.io/k8s-minikube/kicbase:v0.0.8   "/usr/local/bin/entr…"   3 weeks ago         Up 45 seconds       127.0.0.1:32815->22/tcp, 127.0.0.1:32814->2376/tcp, 127.0.0.1:32813->8443/tcp   minikube

并检查.ssh目录内容是否存在。

$ docker exec -it 5ad64f642b63 ls /ssh-directory
id_rsa  id_rsa.pub  known_hosts

我有部署 yml 作为

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: api-deployment
  labels:
    stack: api
    app: api-web
spec:
  replicas: 1
  selector:
    matchLabels:
      app: api-web
  template:
    metadata:
      labels:
        app: api-web
    spec:
      containers:
        - name: api-web-pod
          image: tiangolo/uwsgi-nginx-flask 
          ports:
            - name: api-web-port
              containerPort: 80
          envFrom:
            - secretRef:
                name: api-secrets
          volumeMounts:
            - name: ssh-directory
              mountPath: /app/.ssh
      volumes:
        - name: ssh-directory
          hostPath:
            path: /ssh-directory/
            type: Directory

当它运行时，它会给出错误/ssh-directory。

$ kubectl describe pod/api-deployment-f65db9c6c-cwtvt
Name:           api-deployment-f65db9c6c-cwtvt
Namespace:      default
Priority:       0
Node:           minikube/172.17.0.2
Start Time:     Sat, 02 May 2020 23:07:51 -0500
Labels:         app=api-web
                pod-template-hash=f65db9c6c
Annotations:    <none>
Status:         Pending
IP:
Controlled By:  ReplicaSet/api-deployment-f65db9c6c
Containers:
  api-web-pod:
    Container ID:
    Image:          tiangolo/uwsgi-nginx-flask
    Image ID:
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Waiting
      Reason:       ContainerCreating
    Ready:          False
    Restart Count:  0
    Environment Variables from:
      api-secrets  Secret  Optional: false
    Environment:      <none>
    Mounts:
      /app/.ssh from ssh-directory (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-9shz5 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             False
  ContainersReady   False
  PodScheduled      True
Volumes:
  ssh-directory:
    Type:          HostPath (bare host directory volume)
    Path:          /ssh-directory/
    HostPathType:  Directory
  default-token-9shz5:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-9shz5
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason       Age                 From               Message
  ----     ------       ----                ----               -------
  Normal   Scheduled    <unknown>           default-scheduler  Successfully assigned default/api-deployment-f65db9c6c-cwtvt to minikube
  Warning  FailedMount  11m                 kubelet, minikube  Unable to attach or mount volumes: unmounted volumes=[ssh-directory], unattached volumes=[default-token-9shz5 ssh-directory]: timed out waiting for the condition
  Warning  FailedMount  2m13s (x4 over 9m)  kubelet, minikube  Unable to attach or mount volumes: unmounted volumes=[ssh-directory], unattached volumes=[ssh-directory default-token-9shz5]: timed out waiting for the condition
  Warning  FailedMount  62s (x14 over 13m)  kubelet, minikube  MountVolume.SetUp failed for volume "ssh-directory" : hostPath type check failed: /ssh-directory/ is not a directory

当我检查/ssh-directorydocker 中的内容时。

它给出了 IO 错误。

$ docker exec -it 5ad64f642b63 ls /ssh-directory
ls: cannot access '/ssh-directory': Input/output error

我知道 Minikube 有默认的挂载点。如https://minikube.sigs.k8s.io/docs/handbook/mount/中所述，

+------------+----------+---------------+----------------+
| Driver     |    OS    | HostFolder    | VM             |
+------------+----------+---------------+----------------+
| VirtualBox | Linux    | /home         |/hosthome       |
+------------+----------+---------------+----------------+
| VirtualBox | macOS    | /Users        |/Users          |
+------------+----------+---------------+----------------+
| VirtualBox | Windows  |C://Users      | /c/Users       |
+------------+----------+---------------+----------------+
|VMware Fusio|  macOS   |/Users         |/Users          |
+------------+----------+---------------+----------------+
| KVM        | Linux    | Unsupported.  |                |
+------------+----------+---------------+----------------+
| HyperKit   | Linux    | Unsupported   |(see NFS mounts)|  
+------------+----------+---------------+----------------+

但是我安装了 minikube asbrew install minikube并将其设置driver为docker.

$ cat ~/.minikube/config/config.json
{
    "driver": "docker"
}

docker挂载点中没有驱动程序的映射。

最初，此目录包含文件，但不知何故，当我尝试创建 pod 时，它被删除或出现问题。

标签： dockerkubernetesminikube

解决方案

在 ubuntu 上复制此内容时，我遇到了确切的问题。

该目录确实看起来像已安装但缺少文件，这使我认为这是使用 docker 驱动程序安装目录的一般问题。

在 github 上有关于相同问题的未解决问题（挂载目录为空）并打开功能请求以将主机卷挂载到 docker 驱动程序中。

检查 minikube 容器没有显示该已挂载卷的记录，并确认 github 请求中提到的信息，即目前与主机共享的唯一卷是默认挂载的卷（即/var/lib/docker/volumes/minikube/_data挂载到 minikube 的/var目录中）。

$ docker inspect minikube
"Mounts": [ 
  { 
    "Type": "volume", 
    "Name": "minikube", 
    "Source": "/var/lib/docker/volumes/minikube/_data", 
    "Destination": "/var", 
    "Driver": "local", 
    "Mode": "z", 
    "RW": true, 
    "Propagation": ""
  }

作为解决方法，您可以.ssh使用以下命令将目录复制到正在运行的 minikube docker 容器中：

docker cp  $HOME/.ssh minikube:<DESIRED_DIRECTORY>

然后将这个所需的目录挂载到 pod 中。

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