Feb 12, 2017 There is a nasty bug in Docker 1.9.x that is causing java processes to hang and frankly hang up the entire container instance, spinning 100% CPU. I currently have docker. If you are already running Docker on your machine, first read Docker Desktop for Mac vs. Docker Toolbox to understand the impact of this installation on your existing setup, how to set your environment for Docker Desktop on Mac, and how the two products can coexist.
The platform known as Docker has become one of the most popular ways to run a new kind of software known as containerized apps. And while Docker's mainly aimed at programmer types, there are a few reasons why everyday Mac users might want it around as well.
Mac Os UpdateWhat are containerized apps?
Containerized apps are tidy little packages of software that bundle nearly everything they need to run in a single, self-contained box.
Programmers can write an app once and know that it'll run anywhere, every time. Businesses get an efficient way to run lots of apps on a single server without straining their hardware. And users get apps that won't sprawl out and spread files into their hard drives' nooks and crannies, nor start hogging memory and slowing down the entire computer.
How does Docker work?
Docker uses emulation to ensure that the same containerized app can run on any machine where Docker's installed. And because it emulates an operating system – usually some flavor of Linux, though you can also set it up to run enterprise versions of Windows – instead of actual chip hardware, it demands a lot less memory and processing power than traditional virtual machines like Parallels or VMware Fusion.
Unlike those apps, you can't use Docker to run Windows on your Mac – though you can run at least limited versions of Linux with it. And you can use Docker to run apps that weren't originally written for the Mac.
Once you fire up the easy-to-install Docker app, it runs in the background, and you can use the Terminal or another app called Kitematic (we'll get to that later) to install and run containerized apps.
Who is Docker for?
As mentioned above, Docker's mainly aimed at programmers who want to containerize existing apps or write new ones, and businesses and IT folks who want to use its industrial-grade software.
There are Docker versions of familiar desktop apps like Firefox, Chrome, Skype, Spotify, image editor GiMP, and audio editor Audacity. But most of these apps already have native Mac versions. Running them in containers only makes sense if you like the technical challenge, want to keep a single app from hogging all your system's memory, or want to ensure that any malware you might pick up while browsing the web stays stuck inside its container, unable to escape to the rest of your Mac.
As of this writing, the main reason I've found to run Docker on a Mac is Pi-hole, originally made for the Raspberry Pi. Pi-hole can automatically block Web ads across your entire home network, and Docker's the only way to get it working on a Mac without also having a Raspberry Pi.
How to install Docker on your Mac1. Create a Docker Hub account
Docker Hub keeps track of the containers you're running (or creating) and provides a one-stop shop to find new ones. Sign up for a Docker account with a unique Docker ID, your email, and a strong password.
2. Download Docker Desktop for Mac
Once you've signed up and signed in to Docker Hub, get Docker Desktop for Mac. It's got everything you'll need to run Docker in one Mac-friendly installer. Your Mac needs to be running Mac OS Sierra or later, and have at least 4GB of RAM.
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3. Install Docker Desktop on your Mac
Open the
docker.dmg file you downloaded, and drag the Docker app's cartoon whale icon into your Applications folder.
4. Open and run Docker
When you run the Docker app, a little whale icon will appear on the right side of the menubar atop your screen. It'll take a few minutes to get running, and Docker may ask your permission to use services on your computer. The app will also prompt you to enter the Docker ID and password you just created.
When containers stop appearing and disappearing atop the little whale icon in the menubar, and you see a green dot at the top of the Docker menu next to 'Docker Desktop is running,' you're all set.
Consult the Preferences in the Docker menu to control how big a chunk of your hard drive Docker's allotted, and how much of your memory and CPU it's allowed to use, among other options.
5. Download and install Kitematic
Kitematic lets you install, manage, and remove your Docker containers from a single graphical interface — a lifesaver if you're not familiar or comfortable with the Terminal. You can install, and later open, Kitematic directly from the Docker app's menu:
Follow the link in that dialog box to install Kitematic. The app may ask for — you guessed it — your Docker ID and password again, just to keep track of your containers.
From Kitematic, you can search for and install new containers, and delete, edit, stop, or restart existing ones. If a container's running, Kitematic gives you an easy way to view its log files, which aren't readily visible from the Terminal. The interface is fairly intuitive, so feel free to play around and see what you can do.
In my tests, Kitematic came in most useful for deleting troublesome containers whose installation I'd somehow botched. Just find the container in the list on the left side of the Kitematic window, click the X icon next to it, and the container's gone completely, for good. You can always reinstall a package, either from the Terminal or by searching for it in Kitematic, and try again.
Docker Mac Os ImageWhere can I learn more about Docker for Mac?
Consult Docker for Mac's help files for more information about getting started, ways to test that your installation's up and running smoothly, and more things you can do with Docker. There's also a guide to teach you how to create your own containerized apps.
For less technically inclined folks, it's tough to find a good list of desktop apps that work with Docker. Docker Hub doesn't break desktop apps into their own category, but Jessie Frazelle compiled this list in 2015.
Besides Pi-hole, do you have any favorite Docker containers that might benefit everyday Mac users? Ship them our way in the comments below.
macOS CatalinaMain? ❤️All 17 Italian Apple Stores are now closed through next week
We knew that Apple Stores would close in Italy this weekend. But now they're closed from tomorrow, too.
Docker for Mac offers a Mac native application that installs in
/Applications . It creates symlinks (symbolic links) in /usr/local/bin for docker and docker-compose to the Mac versions of the commands in the application bundle.
The Docker for Mac bundle installs:
Are you already running Docker Toolbox and/or Docker Machine?
If so, you need to do a little more work. First, check whether Docker Toolbox environment variables are set:
If you don’t get output, you can go ahead and use Docker for Mac. However, if you do get output (like in the example), you need to unset the Docker variables so the client can talk to the Docker for Mac Engine. Run:
If you use Bash, you can use
unset ${!DOCKER_*} to unset all of the Docker environment variables (this does not work in other shells, like zsh or csh ).
When you run
env | grep DOCKER now, you should see no output.
Running Docker Toolbox and Docker for Mac on the same host
You can run both Docker Toolbox and Docker for Mac on the same system, but not at the same time.
When you use Docker for Mac, you need to unset all of your environment variables, using one of the methods above. When you want to use a VirtualBox VM you have set up with
docker-machine , simply run eval $(docker-machine env default) (assuming you want to target the machine “default”).
Docker Machine
Docker for Mac does not affect previous machines created via Docker Machine, The installation gives you the option to copy containers and images from your local
default machine if you have one.
Requirements
You must have a Mac:
Before You Install
Take a few minutes to understand some key concepts before you install Docker.
On an “out-of-the-box” Linux installation, the Docker client, daemon, and all containers run directly on localhost, meaning you can access ports on a Docker container using localhost addressing; something like
localhost:8080 or 0.0.0.0:8376 .
On macOS, Docker’s daemon runs inside a Linux VM. The macOS Docker client talks to the Docker host VM, and your containers run on the host. You cannot use localhost in this setting; instead, the container’s ports map to the VM’s ports. If your VM has the IP address 10.0.0.5, access the ports like
10.0.0.5:8000 or 10.0.0.5:8376 .
Installation
That’s it!
Verification
Check versions of Docker Engine, Compose, and Machine.
Run a Dockerized web server to make sure everything works:
Docker Desktop For Mac Download
If you do not have the image locally, Docker pulls it from Docker Hub (more on this later). Visit http://localhost to bring up your new homepage; you should see:
Welcome to nginx!Mac Os Mojave
If you see this page, the nginx web server is successfully installed and working. Further configuration is required.
For online documentation and support please refer to nginx.org.Commercial support is available at nginx.com.
Thank you for using nginx.
Common PitfallsOperating System
Unfortunately, if you do not run “Mountain Lion” or later, you cannot run Docker for Mac. You can upgrade your OS to the most recent viable version, provided your system supports it.
Docker Desktop MacShell Scripts
If you use a shell script to set the Docker environment variables every time you open a command window (Terminal), you need to unset the variables every time you use Docker for Mac (alternately, you can write a shell script to follow behind and unset the variables).
Multiple Docker Versions
Docker for Mac replaces
docker and docker-compose with its own versions; if you already have Docker Toolbox on your Mac, Docker for Mac still replaces the binaries. You want the Docker client and Engine to match versions; mismatches can cause problems where the client and host cannot communicate. If you already have Docker Toolbox, and then you install Docker for Mac, you may get a newer version of the Docker client. Running docker version in a command shell displays the version of the client and server you have on your system.
This may also happen if you use Docker Universal Control Plane (UCP).
If you want to support both Docker Toolbox and Docker for Mac, check out the Docker Version Manager (DVM).
Next: Install Docker on Windows 10
Requirements and things to know before installing Docker for Win 10. Comments are closed.
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