- #Docker run image volume how to#
- #Docker run image volume install#
- #Docker run image volume upgrade#
The Docker container executes the rm -rf /home/notImportantDir command inside of the container. The / from the host was mounted in the Docker container as /home/notImportantDir/ directory. Oops, something went wrong? Yep, long story short, you got no system. The -v flag gives us the ability to mount a volume, so we mount / volume from the host and we specify that it will be available at /home/notImportantDir/. Let’s run this very innocent docker image and give the container / directory as volume. We build the image with Dockerfile from the current directory and we specify a friendly name with the -t option. We want to use the debian:stretch base image, and then execute the rm -rf /home/notImportantDir command. Bare with me as we go through some of the dark scenarios of malicious Docker images. What can possibly go wrong? Well… a lot of things. So when you run a docker process, it gets the privileges of the root. For details on how this impacts security in your system, see Docker Daemon Attack Surface. The docker group grants privileges equivalent to the root user.
#Docker run image volume install#
When we install the docker, we go through docker post-install. Wait… What? Yes, the user with uuid=0 is a root. It relies on the host kernel, so the user inside of the docker container with uuid=0 is the same user on the host system with uuid=0. The great part of the Docker is that it is lightweight, but what does it entail? The Docker container does not have its own kernel. Docker is sharing a kernel with the host machine Moreover, we’ll tackle the uid and gid mechanism in linux kernel.
#Docker run image volume how to#
We will consider some scenarios of malicious Docker images and how to protect your host machine from that.
In this article, we’ll look under the hood of Docker container privileges. A significant part of the IT world relies on Docker containers as they are easy to use and portable. This is done by passing the user ID and group ID to the container via the USER_ID and GROUP_ID environment variables.Docker is quite a viral technology. To avoid any problem, you can specify the user tinyMediaManager should run as. This could prevent the container from properly accessing files and folders on the shared volume and vice versa. For example, the user within the container may not exist on the host or does not match the right user on the host. When using using data volumes (-v flags for /data and media), permissions issues can occur between the host and the container (tinyMediaManager). See below for an example how to use this.
ID of the group tinyMediaManager runs as. This image offers some special configuration parameters which can be passed to docker by using environment variables Variable You need read/write access to all mapped volumes! Configuration
#Docker run image volume upgrade#
If you do not map this out of the container, all your data/settings will be lost on an upgrade of tinyMediaManager /data: where all local data of tinyMediaManager will be stores.You should map the following folders to a volume/folder on the host: E.g.:Īfter starting the container, you can access tinyMediaManager via Data volumes Map local volumes/folders/mounts to /media/xxx where all media will be accessed.Map a local volume/folder to /data where all local data from tinyMediaManager is stores (like data, logs, cache and backups).Map any local port to 4000 for web access (via noVNC).Using this image, you will get a fully working instance of tinyMediaManager which is accessible remotely (via web/VNC). This image should work on any x86_64 device. This image includes all needed components (up to date libmediainfo, FFmpeg, …) for the best experience. TinyMediaManager offers an (experimental) official docker image based on Debian Buster (for maximum compatibility). Install tinyMediaManager via docker on a Synology NAS.
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