Get started with Docker for Mac

Estimated reading time: 12 minutes

Welcome to Docker for Mac!

Docker is a full development platform for creating containerized apps, and Docker for Mac is the best way to get started with Docker on a Mac.

Got Docker for Mac? If you have not yet installed Docker for Mac, please see Install Docker for Mac for an explanation of stable and beta channels, system requirements, and download/install information.

Looking for system requirements? Check out What to know before you install, which has moved to the new install topic.

Check versions of Docker Engine, Compose, and Machine

Run these commands to test if your versions of docker, docker-compose, and docker-machine are up-to-date and compatible with Docker.app.

$ docker --version
Docker version 17.03.0-ce, build 60ccb22

$ docker-compose --version
docker-compose version 1.11.2, build dfed245

$ docker-machine --version
docker-machine version 0.10.0, build 76ed2a6

Note: The above is an example. Your output will differ if you are running different (e.g., newer) versions.

Explore the application and run examples

  1. Open a command-line terminal, and run some Docker commands to verify that Docker is working as expected.

    Some good commands to try are docker version to check that you have the latest release installed, and docker ps and docker run hello-world to verify that Docker is running.

  2. For something more adventurous, start a Dockerized web server.

    docker run -d -p 80:80 --name webserver nginx
    

    If the image is not found locally, Docker will pull it from Docker Hub.

    In a web browser, go to http://localhost/ to bring up the home page. (Since you specified the default HTTP port, it isn’t necessary to append :80 at the end of the URL.)

    nginx home page

    Note: Early beta releases used docker as the hostname to build the URL. Now, ports are exposed on the private IP addresses of the VM and forwarded to localhost with no other host name set. See also, Release Notes for Beta 9.

  3. Run docker ps while your web server is running to see details on the webserver container.

        CONTAINER ID        IMAGE                COMMAND                  CREATED              STATUS              PORTS                              NAMES
        56f433965490        nginx                "nginx -g 'daemon off"   About a minute ago   Up About a minute   0.0.0.0:80->80/tcp, 443/tcp   webserver
    
  4. Stop or remove containers and images.

    The nginx webserver will continue to run in the container on that port until you stop and/or remove the container. If you want to stop the webserver, type: docker stop webserver and start it again with docker start webserver. A stopped container will not show up with docker ps; for that, you need to run docker ps -a.

    To stop and remove the running container with a single command, type: docker rm -f webserver. This will remove the container, but not the nginx image. You can list local images with docker images. You might want to keep some images around so that you don’t have to pull them again from Docker Hub. To remove an image you no longer need, use docker rmi followed by an image ID or image name. For example, docker rmi nginx.

Want more example applications? Learn Docker is a great place to start.

Preferences

Choose whale-x –> Preferences from the menu bar.

Docker context menu

You can set the following runtime options.

General

Preferences

Auto-start, update, backups, usage data

  • Docker for Mac is set to automatically start Docker when you log in. Uncheck this option if you don’t want Docker to start when you open your session.

  • Docker for Mac is set to automatically check for updates and notify you when an update is available. If an update is found, click OK to accept and install it (or cancel to keep the current version). If you disable the check for updates, you can still find out about updates manually by choosing whale-x -> Check for Updates

  • Check Exclude VM from Time Machine backups to prevent Time Machine from backing up the Docker for Mac virtual machine.

  • Send usage statistics — You can set Docker for Mac to auto-send diagnostics, crash reports, and usage data. This information can help Docker improve the application and get more context for troubleshooting problems. Uncheck this to opt out and prevent auto-send of data. Docker may prompt for more information in some cases, even with auto-send enabled.

File sharing

You can decide which directories on your Mac to share with containers.

  • Add a Directory - Click + and navigate to the directory you want to add.

    File Sharing

  • Click Apply & Restart to make the directory available to containers using Docker’s bind mount (-v) feature.

    There are some limitations on the directories that can be shared:

    • They cannot be a subdirectory of an already shared directory.

    • They cannot already exist inside of Docker.

See Namespaces in the topic on osxfs file system sharing for more information.

Tip: File sharing is required for volume mounting if the project lives outside of the /Users directory. In that case, share the drive where the Dockerfile and volume are located. Otherwise, you will get file not found or cannot start service errors at runtime. (See also Volume mounting requires file sharing for any project directories outside of /Users.)

Advanced

Advanced Preference settings-advanced

CPUs

By default, Docker for Mac is set to use 2 processors. You can increase processing power for the app by setting this to a higher number, or lower it to have Docker for Mac use fewer computing resources.

Memory

By default, Docker for Mac is set to use 2 GB runtime memory, allocated from the total available memory on your Mac. You can increase the RAM on the app to get faster performance by setting this number higher (for example to 3) or lower (to 1) if you want Docker for Mac to use less memory.

Storage location

You can specify the storage location of the Linux volume; i.e., where containers and images are stored.

Disk image location (Beta)

Starting with Beta 39, storage image is referred to as disk image, and is tracked by the app. If you attempt to move the disk image to a location that already has one, you will get a prompt asking if you want to use the existing image or replace it. For Beta releases going forward, the labels on this dialog were updated as follows.

  • Storage location is renamed to Disk image location
  • Change location button is renamed to move disk image

Beta Advanced settings

HTTP proxy settings

Docker for Mac will detect HTTP/HTTPS Proxy Settings and automatically propagate these to Docker and to your containers. For example, if you set your proxy settings to http://proxy.example.com, Docker will use this proxy when pulling containers.

Proxies settings

Docker Daemon

You can configure options on the Docker daemon that determine how your containers will run. You can configure some Basic options on the daemon with interactive settings, or switch to Advanced to edit the JSON directly.

The settings offered on Basic dialog can be configured directly in the JSON as well. This version just surfaces some of the commmon settings to make it easier to configure them.

Daemon

Experimental mode

Starting with Stable 1.13.0 and Beta 31, both Docker for Mac Stable and Beta releases have experimental features enabled on Docker Engine, as described in the Docker Experimental Features README on GitHub.

Experimental features are not appropriate for production environments or workloads. They are meant to be sandbox experiments for new ideas. Some experimental features may become incorporated into upcoming stable releases, but others may be modified or pulled from subsequent Betas, and never released on Stable.

On both Beta and Stable releases, you can toggle experimental mode on and off. If you toggle it off, Docker for Mac uses the current generally available release of Docker Engine.

You can check whether you are running experimental mode or not by typing docker version on the command line. Experimental mode is listed under Server data. If Experimental is true, then Docker is running in experimental mode, as shown here. (If false, Experimental mode is off.)

$ docker version
Client:
 Version:      1.13.0-rc3
 API version:  1.25
 Go version:   go1.7.3
 Git commit:   4d92237
 Built:        Tue Dec  6 01:15:44 2016
 OS/Arch:      darwin/amd64

Server:
 Version:      1.13.0-rc3
 API version:  1.25 (minimum version 1.12)
 Go version:   go1.7.3
 Git commit:   4d92237
 Built:        Tue Dec  6 01:15:44 2016
 OS/Arch:      linux/amd64
 Experimental: true

Custom registries

As an alternative to using Docker Hub to store your public or private images or Docker Trusted Registry, you can use Docker to set up your own insecure registry. Add URLs for insecure registries and registry mirrors on which to host your images. (See also, How do I add custom CA certificates? in the FAQs.)

Edit the daemon configuration file

On the Daemon -> Advanced dialog, you can directly configure the daemon from the JSON file, and determine entirely how your containers will run. For a full list of options on the Docker daemon, see daemon in the Docker Engine command line reference.

After editing the daemon configuration , click Apply & Restart to save it and reboot Docker. Or, to cancel changes, click another preference tab, then choose to discard or not apply changes when asked.

Docker Daemon

Uninstall or reset

Choose whale-x –> Preferences from the menu bar, then click Uninstall / Reset on the Preferences dialog.

Uninstall or reset Docker

  • Uninstall - Choose this option to remove Docker for Mac from your system.

  • Reset to factory defaults - Choose this option to reset all options on Docker for Mac to its initial state, the same as when it was first installed.

You can uninstall Docker for Mac from the command line with this command: <DockerforMacPath> --uninstall. If Docker is installed in the default location, the following command will provide a clean uninstall.

$ /Applications/Docker.app/Contents/MacOS/Docker --uninstall
Docker is running, exiting...
Docker uninstalled successfully. You can move the Docker application to the trash.

You might want to use the command-line uninstall if, for example, you find that the app is non-functional, and you cannot uninstall it from the menu.

Installing bash completion

If you are using bash completion, such as homebrew bash-completion on Mac bash completion scripts for the following commands may be found inside Docker.app, in the Contents/Resources/etc/ directory:

  • docker
  • docker-machine
  • docker-compose

To activate bash completion, these files need to be copied or symlinked to your bash_completion.d/ directory. For example, if you use Homebrew:

ln -s /Applications/Docker.app/Contents/Resources/etc/docker.bash-completion /usr/local/etc/bash_completion.d/docker
ln -s /Applications/Docker.app/Contents/Resources/etc/docker-machine.bash-completion /usr/local/etc/bash_completion.d/docker-machine
ln -s /Applications/Docker.app/Contents/Resources/etc/docker-compose.bash-completion /usr/local/etc/bash_completion.d/docker-compose

Giving feedback and getting help

To get help from the community, review current user topics, join or start a discussion, log on to our Docker for Mac forum.

To report bugs or problems, log on to Docker for Mac issues on GitHub, where you can review community reported issues, and file new ones. See Diagnose problems, send feedback, and create GitHub issues. As a part of reporting issues on GitHub, we can help you troubleshoot the log data.

To give us feedback on the documentation or update it yourself, use the Feedback options at the bottom of each docs page.

Docker Store

Choose Docker Store from the Docker for Mac menu to get to the Docker app downloads site. Docker store is a component of the next-generation Docker Hub, and the best place to find compliant, trusted commercial and free software distributed as Docker Images.

Docker Store

Docker Cloud

You can access your Docker Cloud account from within Docker for Mac.

Docker Cloud

From the Docker for Mac menu, sign in to Docker Cloud with your Docker ID, or create one.

Docker Cloud sign-in

Then use the Docker for Mac menu to create, view, or navigate directly to your Cloud resources, including organizations, repositories, and swarms.

Check out these Docker Cloud topics to learn more:

Where to go next

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