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Docker: added guide to find volumes container

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Marten B. Kante
2026-03-17 03:20:52 +01:00
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wiki/docker.md
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@@ -1,7 +1,7 @@
# Docker # Docker
Docker is a virtualization software that deploys docker containers. Docker is a virtualization software that deploys docker containers.
Due to easy handling and reproducable environments it is a useful tool. Due to easy handling and reproducible environments it is a useful tool.
## Setup ## Setup
@@ -23,36 +23,40 @@ This section addresses various features of Docker.
### Virtualize Operating Systems ### Virtualize Operating Systems
Docker is a tool that can be used to virtualize different programs and softwares. Docker is a tool that can be used to virtualize different programs and software.
Especially for containerizing and virtualizing operating systems (mostly based on Especially for containerizing and virtualizing operating systems (mostly based on
[Linux](/wiki/linux.md)) can be handled by [distrobox](https://github.com/89luca89/distrobox). [Linux](/wiki/linux.md)) can be handled by [Distrobox](https://github.com/89luca89/distrobox).
### Run Docker as non-root user ### Run Docker as non-root user
To run docker as a non-root user you need to add your user to the `docker` group. To run docker as a non-root user you need to add your user to the `docker` group.
To do this create the group docker if it doesn't exist `sudo groupadd docker` To do this, create the group docker if it doesn't exist `sudo groupadd docker`
and then add your user to the group using `sudo usermod -aG docker $USER`. and then add your user to the group using `sudo usermod -aG docker $USER`.
After that relog into your machine and you should be able to run After that log back into your machine.
`docker run hello-world`. Then you should be able to run the following.
### Tools and Visualisation ```sh
docker run hello-world
```
### Tools and Visualization
The programs below are useful docker-management systems in different style. The programs below are useful docker-management systems in different style.
- [ctop](https://github.com/bcicen/ctop): top-like cli interface for containers - [ctop](https://github.com/bcicen/ctop): top-like CLI interface for containers
- [portainer](https://www.portainer.io/): web ui for managing docker and kubernetes - [Portainer](https://www.portainer.io/): web UI for managing docker and Kubernetes
### Enable Nvidia GPUs ### Enable Nvidia GPUs
To use Nvidia GPUs with docker you need to install the nvidia-cuda-toolkit. To use Nvidia GPUs with docker you need to install the Nvidia CUDA toolkit.
There is a [guide on marmelab](https://marmelab.com/blog/2018/03/21/using-nvidia-gpu-within-docker-container.html) There is a [guide on Marmelab](https://marmelab.com/blog/2018/03/21/using-nvidia-gpu-within-docker-container.html)
that focusses on that topic. that focuses on that topic.
### Block remote port access ### Block remote port access
If you configured a [reverse proxy](/wiki/reverse-proxy.md) to a port chances If you configured a [reverse proxy](/wiki/reverse-proxy.md) to a port chances
are you don't want the port to be accessed outside of the proxy. are you don't want the port to be accessed outside the proxy.
Especially if you set up a authentication over nginx the open port will avoid Especially if you set up an authentication over nginx the open port will avoid
the authentication. the authentication.
This can be changed at the forwarded docker-service by replacing for example This can be changed at the forwarded docker-service by replacing for example
`-p 7000:7000` with `-p 172.17.0.1:7000:7000`. `-p 7000:7000` with `-p 172.17.0.1:7000:7000`.
@@ -62,29 +66,49 @@ network, effectively banning remote access.
If you use [Traefik](./traefik.md) it is not needed, because you don't have to If you use [Traefik](./traefik.md) it is not needed, because you don't have to
publish ports to reverse proxy them. publish ports to reverse proxy them.
### Dockerize a graphical application ### Containerize a graphical application
A graphical application can easily be dockerized and made available over both A graphical application can easily be containerized using Docker and made available over both
the [web browser](/wiki/web_browser.md) or [VNC](/wiki/vnc.md). the [web browser](/wiki/web_browser.md) or [VNC](/wiki/vnc.md).
For this For this
[jlesages baseimage-gui container](https://hub.docker.com/r/jlesage/baseimage-gui) [jlesages baseimage-gui container](https://hub.docker.com/r/jlesage/baseimage-gui)
can be used. can be used.
## Troubleshooting ### Find the Container and the Mounting Point of a Volume
Sometimes it is unclear which container a volume belongs to.
This is especially the case if the volume was created automatically and not manually or explicitly
during the setup.
The following command will output the container a volume with the name `<volume-name>` belongs to.
```sh
docker ps -a --filter volume=<volume_name>
```
Additionally, the mounting point is also of interest.
To display it, run the following command where `<container-name>` is the name of the container the
volume belongs to.
```sh
docker inspect <container-name>
```
## Troubleshooting
This section will focus on errors and the fixing of errors of docker. This section will focus on errors and the fixing of errors of docker.
### `Error saving credentials: 'Cannot autolaunch D-Bus without X11 $DISPLAY'` ### `Error saving credentials: 'Cannot autolaunch D-Bus without X11 $DISPLAY'`
As explained by As explained by
[gotam19 in a Docker forum post](https://forums.docker.com/t/docker-login-fails-with-error-message-saving-credentials-cannot-autolaunch-d-bus-without-x11-display/77789) [gotam19 in a Docker forum post](https://forums.docker.com/t/docker-login-fails-with-error-message-saving-credentials-cannot-autolaunch-d-bus-without-x11-display/77789)
this error message only occurs on [Linux](/wiki/linux.md) when trying to login or pulling a Docker this error message only occurs on [Linux](/wiki/linux.md) when trying to log in or pulling a Docker
image. image.
To fix it install [GPG](/wiki/linux/gpg.md) and the `pass` To fix it install [GPG](/wiki/linux/gpg.md) and the `pass`
[package](/wiki/linux/package_manager.md). [package](/wiki/linux/package_manager.md).
Afterwards running the following command should will perform the login to the Docker servers and Afterward running the following command perform the login to the Docker servers and the error
the error message should not come up again. message should not come up again.
```sh ```sh
docker login docker login
``` ```

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wiki/vnc.md
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@@ -6,7 +6,7 @@ It is based on the Remote Frame Buffer protocoll which is also named RFB.
VNC is especially used for accessing graphical applications or VNC is especially used for accessing graphical applications or
[terminals](/wiki/linux/system_console.md) of a remote server, [terminals](/wiki/linux/system_console.md) of a remote server,
[dockerized](/wiki/docker.md#dockerize-a-graphical-application) or virtualized [dockerized](/wiki/docker.md#containerize-a-graphical-application) or virtualized
program. program.
## VNC Clients ## VNC Clients