Docker For Mac Raw Format

Docker For Mac Raw Format Free
Docker For Mac Raw Format Free
Docker For Mac Os
Docker Mac Address

If you're on a Mac, make sure the Docker engine is running. If you're on Linux, then prefix your docker commands with sudo. Alternatively, you can create a docker group to get rid of this issue. The pull command fetches the busybox image from the Docker registry and saves it to our system. Creating a new qcow2 on 17.09, Docker uses com.docker.driver.amd64-linux/disk/path but ignores size. Edit: On a fresh install of 17.09, stopping Docker and running qemu-img resize Docker.qcow2 +100G then restarting works. VM looks like it resizes the fs itself. Moving the file seems to be broken via the UI though docker/for-mac#2170.

Step 2: Customize and Push to Docker Hub

The last step used an official Docker image. Next step, create your own custom image. You should have a Docker ID, you probably created it to download Docker Desktop.

In your favorite text editor create a file called Dockerfile in the same directory you used in step 1. No extension, just Dockerfile. Paste in this code and save the file:

This tells Docker to use the same nginx base image, and create a layer that adds in the HTML you created in the last step. Instead of creating a volume that accesses the file directly from the host you are running on, it adds the file to the image. To build the image, in your terminal, type:

Two things, first replace <YourDockerID> with your Docker ID. Also notice the “.” at the end of the line. That tells Docker to build in the context of this directory. So when it looks to COPY the file to /usr/share/nginx/html it will use the file from this directory.

You can run it:

And go to http://localhost:8080 to see the page.

Next login to Docker Hub. You can do this directly from Docker Desktop. Or you can do it from the command line by typing.

Finally push your image to Docker Hub:

You may be asked to login if you haven’t already. Then you can go to hub.docker.com, login and check your repositories

To clean up before moving to the next section, run

Docker has been widely adopted and is used to run and scale applications in production. Additionally, it can be used to start applications quickly by executing a single Docker command.

Companies also are investing more and more effort into improving development in local and remote Docker containers, which comes with a lot of advantages as well.

You can get the basic information about your Docker configuration by executing:

The output contains information about your storage driver and your docker root directory.

The storage location of Docker images and containers

A Docker container consists of network settings, volumes, and images. The location of Docker files depends on your operating system. Here is an overview for the most used operating systems:

Ubuntu: /var/lib/docker/
Fedora: /var/lib/docker/
Debian: /var/lib/docker/
Windows: C:ProgramDataDockerDesktop
MacOS: ~/Library/Containers/com.docker.docker/Data/vms/0/

In macOS and Windows, Docker runs Linux containers in a virtual environment. Therefore, there are some additional things to know.

Docker for Mac

Docker is not natively compatible with macOS, so Hyperkit is used to run a virtual image. Its virtual image data is located in:

~/Library/Containers/com.docker.docker/Data/vms/0

Within the virtual image, the path is the default Docker path /var/lib/docker.

You can investigate your Docker root directory by creating a shell in the virtual environment:

You can kill this session by pressing Ctrl+a, followed by pressing k and y.

Docker for Windows

On Windows, Docker is a bit fractioned. There are native Windows containers that work similarly to Linux containers. Linux containers are run in a minimal Hyper-V based virtual environment.

The configuration and the virtual image to execute linux images are saved in the default Docker root folder.

C:ProgramDataDockerDesktop

If you inspect regular images then you will get linux paths like:

You can connect to the virtual image by:

There, you can go to the referenced location:

The internal structure of the Docker root folder

Inside /var/lib/docker, different information is stored. For example, data for containers, volumes, builds, networks, and clusters.

Docker images

The heaviest contents are usually images. If you use the default storage driver overlay2, then your Docker images are stored in /var/lib/docker/overlay2. There, you can find different files that represent read-only layers of a Docker image and a layer on top of it that contains your changes.

Let’s explore the content by using an example:

The LowerDir contains the read-only layers of an image. The read-write layer that represents changes are part of the UpperDir. In my case, the NGINX UpperDir folder contains the log files:

The MergedDir represents the result of the UpperDir and LowerDir that is used by Docker to run the container. The WorkDir is an internal directory for overlay2 and should be empty.

Docker Volumes

It is possible to add a persistent store to containers to keep data longer than the container exists or to share the volume with the host or with other containers. A container can be started with a volume by using the -v option:

We can get information about the connected volume location by:

The referenced directory contains files from the location /var/log of the NGINX container.

Clean up space used by Docker

It is recommended to use the Docker command to clean up unused containers. Container, networks, images, and the build cache can be cleaned up by executing:

Additionally, you can also remove unused volumes by executing:

Summary

Docker is an important part of many people’s environments and tooling. Sometimes, Docker feels a bit like magic by solving issues in a very smart way without telling the user how things are done behind the scenes. Still, Docker is a regular tool that stores its heavy parts in locations that can be opened and changed.