Docker doesn't provide direct cleanup commands, but it does give you all the tools you need to clean up your system from the command line.

Docker is a tool that makes it easy to run applications in containers. Containers provide isolation and security like virtual machines, but they’re much smaller because they run in the host machine’s system. As an iOS developer, why would you want to use Docker? To avoid version problems — to run versions of operating systems, programming languages, database apps, web apps and web servers, machine learning programs — all in isolated environments, to avoid side effects from whatever else you’ve installed on your Mac. Basically, to join the ranks of it-works-on-my-machine developers! In this tutorial, you’ll get comfortable with Docker vocabulary and commands for creating, inspecting and removing containers, networks and data volumes.

You’ll 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. After completing this tutorial, you’ll be well on your way to Docker ninjadom! Note: This Docker tutorial assumes you’re willing to enter Unix commands in Terminal. Some familiarity with Unix commands and file paths, database apps and localhost ports will be helpful.

Getting Started Click the Download Materials button at the top or bottom of this tutorial to get the project files you’ll use to build the web server app, later in this tutorial. Installing Docker Docker was originally developed for Linux.

Running Docker on macOS used to be pretty complicated, but a native macOS app Docker for Mac launched in July 2016, so now it’s a breeze! The Community Edition (CE) is a free download, so, then install and run the app.

Moby the whale should appear in your Mac’s status bar. Note: There’s a handy list of all the commands in this tutorial — scroll down to the end. Hello World Open Terminal, and enter this command to see that Docker is running OK: docker run hello-world The workhorse Docker command is docker run, and this is the simplest docker run command — it specifies the Docker image to run. 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.

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A Docker image is an app, and you run it on your system in a Docker container. The output of this command explains what Docker just did: Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world d1725b59e92d: Pull complete Digest: sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde488 Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon.

The Docker daemon pulled the 'hello-world' image from the Docker Hub. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading.

The Docker daemon streamed that output to the Docker client, which sent it to your terminal. Wow, lots of new terms to learn! Starting from the top: • Although you only asked for hello-world, Docker looked for hello-world:latest — latest is a tag indicating the version. If you don’t ask for a specific version, Docker assumes you want the latest version. • Because the image isn’t on your system, Docker pulls it from library/hello-world — its location in the default image registry Docker Hub.