![]() It works! The following part of the output is the contents of the mounted directory. $ docker container run -network host -privileged myimage And we can accomplish this with the -privileged flag. Therefore, we must manually add the capability. In fact, this is a good default as the idea behind Docker is isolation from the host machine.įor this reason, our container doesn’t have the capability to mount the network share. Due to this setting, the container has no access to the host’s devices or many other kernel capabilities. More importantly, perhaps, what’s this Unable to apply new capability set? After doing some research, I learned that by default containers run “unprivileged”. It seems as though, there’s an error happening when that command is executed. Runtime privilege and Linux capabilitiesįirst of all, I forgot to mention the test.bash script also un-mounts the share. Umount: /app/mnt : must be superuser to unmount. I do this with the -network host option.īut, when I run the command I receive the following error message: Unable to apply new capability set. docker container run -network host myimageĭue to the share being located on the same network as my host, I need to instruct the container to use the host network. As a result, we can confirm the mount was successful. In addition, to the mounting there’s a command in the script that lists the contents of the mounted location. Removing intermediate container 05c81bd460bdĪt this point, so far, so good… Now, let’s create the container and run the script that mounts the network share. Removing intermediate container 946104eb9d21 Step 4/8 : RUN apt-get update & apt-get install -y cifs-utils Sending build context to Docker daemon 4.096kB ![]() Then, I copy my credentials file into the app directory along with a script (test.bash) that performs the mount command – as elaborated in the previous section. Also, inside of the app directory I’m creating another directory called mnt which I’m using as a mount point for the network share.Īfter the Ubuntu base is installed, I install the cifs-utils package which provides the CIFS protocol support. Then, inside that image I’m creating a directory called app. RUN apt-get update & apt-get install -y cifs-utilsįirst, the base image is Ubuntu 18.04. Here’s the Dockerfile I used to build the Docker image. The two protocols are compatible and synonymous. Similarly, CIFS was developed by Microsoft and is a version of SMB. Accordingly, it is in use on Windows servers and workstations. Later, Microsoft released their own version of the Protocol. It’s a protocol originally developed by IBM. ![]() What’s SMB and CIFS?įor those unfamiliar with SMB and CIFS, they’re network file sharing protocols. As I’ll cover, doing this in the Docker container isn’t as simple. mount -t cifs -o credentials=/path/to/smbcredsĮ/path/to/share /path/to/mount/locationĪs far as mounting the Windows share goes, using the preceding command is all I need. Since I’m using this file, I must supply an argument to the mount command that provides the path to the file I’ll use the -o (options) option. The Linux mount command allows for the use of a file to provide network credentials. mount -t cifs /path/to/share /path/to/mount/location SMB Credentials File Consequently, I must tell the Linux mount command I want to use this protocol I use the -t (type) option. Therefore, to connect and mount the file shares in this environment, my Linux host utilizes the CIFS – Common Internet File System – protocol. This workstation is situated within a large domain managed by Windows Active Directory. The Setupįirst, my host machine is Linux based laptop running Ubuntu 18.04 Desktop with Docker Community Edition installed. However, I was able to achieve the mount, and this post explains the steps I took to achieve the mount. Unfortunately, it wasn’t as straightforward as that. It worked, so I figured I’d simply set up the container to mimic the steps I took to mount the share on the host machine. Thus, I tested the mounting of the share on my local machine. I recently had the need to mount a Windows network file share location within a Docker container.
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