This way, the command you want will be only a few Up Arrow keystrokes away.

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Youll learn how to run Docker containers in the background or foreground, and switch between the two; how to publish ports; how to connect a database app and a web app running in separate containers; and how to share directories between containers and your Mac and among containers.

Containers provide isolation and security like virtual machines, but theyre much smaller because they run in the host machines system.

Basically, to join the ranks of it-works-on-my-machine developers.

After completing this tutorial, youll be well on your way to Docker ninjadom.

Some familiarity with Unix commands and file paths, database apps and localhost ports will be helpful.

Running Docker on macOS used to be pretty complicated, but a native macOS app Docker for Mac launched in July 2016, so now its a breeze.

If the image is not on your host system, it tries to pull it from the default Docker image registry.

The meaning of the word image is similar to the disk images you download as.dmg files.

A Docker image is an app, and you run it on your system in a Docker container.

This message shows that your installation appears to be working correctly.

If you dont ask for a specific version, Docker assumes you want the latest version.

The daemon is the server, and the client is the docker command line interface (CLI).

The client gives instructions to the daemon using the engines REST API.

Running an image creates a container a thin read-write layer on top of the read-only layers of the image.

Each container is just the read-write layer, and only one copy of the image exists on your system.

The images top read-only layer specifies the command to run in the container for hello-world, this command just outputs the Hello from Docker message.

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The full name of the option is --something, with two dashes, like --name or --publish.

The shorthand version is -abbrev, with one dash, like -p for --publish or -v for --volume.

A few dont have values, and can be run together, like -it or -ti, short for --interactive --tty.

You must specify an options value right after the option name, but options and option-value pairs can appear in any order.

For both commands, leaving off the -a option lists only containers that are running.

Option -q is short for --quiet, so the command displays only the numeric IDs.

Option -f is short for --filter, and the filter condition is statusexited.

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