Mounting CIFS/SMB share in Linux container

Vitrix · April 1, 2019, 9:54am

Hi everyone!

I need some advice here… We want to run a pod as a kubernetes job that fetches a file (wget) externally and copies that file on a local SMB/CIFS share.
I noticed ms has created something similar: an smb driver via flexvolume

However, you need to set some specific variables in the kubelet:

github.com

Azure/kubernetes-volume-drivers/blob/master/flexvolume/README.md#config-kubelet-service-to-enable-flexvolume-driver

# kubernetes FlexVolume driver on Azure
This directory contains all kubernetes [FlexVolume](https://kubernetes.io/docs/concepts/storage/volumes/#flexvolume) drivers on azure:

| FlexVolume driver | About |
| ---- | ---- |
| [blobfuse](./blobfuse) | This driver allows Kubernetes to access virtual filesystem backed by the Azure Blob storage. |
| [smb](./smb) | This driver allows Kubernetes to access SMB server by using CIFS/SMB protocol. |

## config kubelet service to enable FlexVolume driver
> Note: skip this step in [AKS](https://azure.microsoft.com/en-us/services/container-service/) or from [acs-engine](https://github.com/Azure/acs-engine) v0.12.0
 - specify `volume-plugin-dir` in kubelet service config

append following two lines **separately** into `/etc/systemd/system/kubelet.service` file
```
  --volume=/etc/kubernetes/volumeplugins:/etc/kubernetes/volumeplugins:rw \
        --volume-plugin-dir=/etc/kubernetes/volumeplugins \
```

```
sudo vi /etc/systemd/system/kubelet.service

This file has been truncated. show original

Is that doable or are there better methods?

anthony · April 16, 2019, 9:32pm

That looks like an interesting subject to look into, however for the specific pretty basic case that you’ve described, I’d go with the ‘smbclient’ utility which is a totally userland tool that won’t require any k8s mods nor privilege escalation.

https://www.samba.org/samba/docs/current/man-html/smbclient.1.html

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Mounting CIFS/SMB share in Linux container

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