This allows you to use a local or remote Docker Daemon. The Docker Daemon is responsible for the state of your containers and images, and facilitates any interaction with “the outside world.” The Docker CLI is merely used to translate commands into API calls that are sent to the Docker Daemon. By default, users can only access the Unix socket using sudo command, which is owned by the user root. It actually binds to a Unix socket instead of a TCP port. However, running an application with Docker means that you have to run the Docker Daemon with root privileges. In most cases, you will only interact with the Docker CLI. Docker is composed of a variety of different tools. The problem with this is that you cannot use Docker directly on your workstation.
![docker and kubernetes the practical guide docker and kubernetes the practical guide](https://containerjournal.com/wp-content/uploads/2019/01/KubernetesDockerpic1.png)
Upon running the image, a container is created.īelow is a simplified diagram of the Docker architecture, taken directly from the official documentation. Once you have the image of your Dockerfile, you can run it. Using Docker, we can use the build command to build our container image.
#Docker and kubernetes the practical guide how to
The Dockerfile details how to build an image based on your application and resources. Container images are specified with the Dockerfile. To understand why the Docker Daemon is running with root access and how this can become a problem, we first have to understand the Docker architecture (at least on a high level).
![docker and kubernetes the practical guide docker and kubernetes the practical guide](https://documentation.peelmicro.info/images/other/docker-multi-docker/PostgresPVC15.png)
![docker and kubernetes the practical guide docker and kubernetes the practical guide](https://documentation.peelmicro.info/images/other/docker-multi-docker/PostgresPVC5.png)
This tutorial will take a look at the downsides of using Docker and Docker alternatives to combat those, namely: We have all read at least once that you should be careful using root access. The most well-known security flaw in Docker is that it requires root access to build your Docker images with the Docker daemon.