- Oct 14, 2019 A couple of years ago, Will Pleasant-Ryan wrote Docker for Mac: Overcoming Slow Mounted Volumes, describing his desire to use Docker for local development. He talked about some of the filesystem performance problems that can arise when using a shared volume from the host machine on Mac OS X, along with some potential workarounds and word of some upcoming performance improvements.
- Docker Installation. A great way to get Docker running smoothly on OS X is to use the awesome project Dinghy.It is basically: Docker on OS X with batteries included, aimed at making a more pleasant local development experience.
- With Docker, developers can build any app in any language using any toolchain. “Dockerized” apps are completely portable and can run anywhere - colleagues’ macOS and Windows laptops, QA servers running Ubuntu in the cloud, and production data center VMs running Red Hat. Docker for Mac is the current release of Docker for.
- Unfortunately the Docker for Mac beta is significantly slower than dinghy for my workflow. I use the vmware driver - between the osxfs driver burning significant CPU and the overhead of xhyve, a build which normally takes a little over 4 minutes ends up taking over 20 minutes.
Docker – What You Should Know as a Machine Learning Engineer Home › Docker › Kubernetes vs. Docker – What You Should Know as a Machine Learning Engineer Earlier this year (2020), I decided to move fully into the engineering part of machine learning from Data Science.
Table of Contents
If you are not familiar with Docker, it is the popular open source container engine.
Most people use Docker for containing applications to deploy into production or for building their applications in a contained environment. This is all fine & dandy, and saves developers & ops engineers huge headaches, but I like to use Docker in a not-so-typical way.
I use Docker to run all the desktop apps on my computers.
But why would I even want to run all these apps in containers? Well let me explain. I used to be an OS X user, and the great thing about OS X is the OS X App Sandbox.
App Sandbox is an access control technology provided in OS X, enforced at the kernel level. Its strategy is twofold:
App Sandbox enables you to describe how your app interacts with the system. The system then grants your app the access it needs to get its job done, and no more.
App Sandbox provides a last line of defense against the theft, corruption, or deletion of user data if an attacker successfully exploits security holes in your app or the frameworks it is linked against.
I am using the Apple App Sandbox as an example so people can grasp the concept easily. I am not saying this is exactly like that and has all the features. This is not a sandbox. It is more like a cool hack.
I hate installing things on my host and the files getting everywhere. I wanted the ability to delete an app and know it is gone fully without some random file hanging around. This gave me that. Not only that, I can control how much CPU and Memory the app uses. Yes, the cpu/memory hungry chrome is now perfectly contained!
“What?!?!”, you say. Let me show you.
The following covers a few of my favorite applications I run in containers. Each of the commands written below is actually pulled directly from my bash aliases. So you can have the same user experience as running one command today.
TUIs (Text User Interface, pronounced too-eee)
Let’s start with some easy text-based applications:
Best IRC client.
The text based email client that rules!
Awesome text based twitter client.
The browser everyone loves (to hate). but secretly I love
Yes I know my blog looks GREAT in lynx
Okay, those text based apps are fun and all but how about we spice things up a bit.
None of the images below use
X11-Forwarding with ssh. Because why should you ever have to install
ssh into a container? EWWW UNNECESSARY BLOAT!
The images work by mounting the
X11 socket into the container! Yippeeeee!
The commands listed below are run on a linux machine. But Mac users, I have a special surprise for you. You can also do fun hacks with X11. Details are described here.
Note my patch was added for
--device /dev/snd in Docker 1.8, before that you needed
-v /dev/snd:/dev/snd --privileged.
Pretty sure everyone knows what chrome is, but my image comes with flash and the google talk plugin so you can do hangouts.
All the 90s hits you ever wanted and more.
Partition your device in a container.
The other video conferencer. This relies on running pulseaudio also ina container.
9. Tor Browser
Because Tor, duh!
That super old school terminal.
So that’s enough examples for now. But of course I have more. All my Dockerfiles live here: github.com/jessfraz/dockerfiles and all my docker images are on the hub: hub.docker.com/u/jess.
I gave a talk on this at Dockercon 2015,check out the video.
In this tutorial, you'll learn how to containerize a .NET Core application with Docker. Containers have many features and benefits, such as being an immutable infrastructure, providing a portable architecture, and enabling scalability. The image can be used to create containers for your local development environment, private cloud, or public cloud.
In this tutorial, you:
- Create and publish a simple .NET Core app
- Create and configure a Dockerfile for .NET Core
- Build a Docker image
- Create and run a Docker container
You'll understand the Docker container build and deploy tasks for a .NET Core application. The Docker platform uses the Docker engine to quickly build and package apps as Docker images. These images are written in the Dockerfile format to be deployed and run in a layered container.
This tutorial is not for ASP.NET Core apps. If you're using ASP.NET Core, see the Learn how to containerize an ASP.NET Core application tutorial.
Install the following prerequisites:
- .NET Core 3.1 SDK
If you have .NET Core installed, use the
dotnet --infocommand to determine which SDK you're using.
- A temporary working folder for the Dockerfile and .NET Core example app. In this tutorial, the name docker-working is used as the working folder.
Create .NET Core app
You need a .NET Core app that the Docker container will run. Open your terminal, create a working folder if you haven't already, and enter it. In the working folder, run the following command to create a new project in a subdirectory named app:
Your folder tree will look like the following:
dotnet new command creates a new folder named App and generates a 'Hello World' console application. Change directories and navigate into the App folder, from your terminal session. Use the
dotnet run command to start the app. The application will run, and print
Hello World! below the command:
The default template creates an app that prints to the terminal and then immediately terminates. For this tutorial, you'll use an app that loops indefinitely. Open the Program.cs file in a text editor.
If you're using Visual Studio Code, from the previous terminal session type the following command:
This will open the App folder that contains the project in Visual Studio Code.
The Program.cs should look like the following C# code:
Replace the file with the following code that counts numbers every second:
Save the file and test the program again with
dotnet run. Remember that this app runs indefinitely. Use the cancel command Ctrl+C to stop it. The following is an example output:
If you pass a number on the command line to the app, it will only count up to that amount and then exit. Try it with
dotnet run -- 5 to count to five.
Any parameters after
-- are not passed to the
dotnet run command and instead are passed to your application.
Publish .NET Core app
Before adding the .NET Core app to the Docker image, first it must be published. It is best to have the container run the published version of the app. To publish the app, run the following command:
This command compiles your app to the publish folder. The path to the publish folder from the working folder should be
From the App folder, get a directory listing of the publish folder to verify that the NetCore.Docker.dll file was created.
ls command to get a directory listing and verify that the NetCore.Docker.dll file was created.
Create the Dockerfile
The Dockerfile file is used by the
docker build command to create a container image. This file is a text file named Dockerfile that doesn't have an extension.
Create a file named Dockerfile in directory containing the .csproj and open it in a text editor. This tutorial will use the ASP.NET Core runtime image (which contains the .NET Core runtime image) and corresponds with the .NET Core console application.
The ASP.NET Core runtime image is used intentionally here, although the
mcr.microsoft.com/dotnet/runtime:3.1 image could have been used.
FROM keyword requires a fully qualified Docker container image name. The Microsoft Container Registry (MCR, mcr.microsoft.com) is a syndicate of Docker Hub - which hosts publicly accessible containers. The
dotnet/core segment is the container repository, where as the
aspnet segment is the container image name. The image is tagged with
3.1, which is used for versioning. Thus,
mcr.microsoft.com/dotnet/aspnet:3.1 is the .NET Core 3.1 runtime. Make sure that you pull the runtime version that matches the runtime targeted by your SDK. For example, the app created in the previous section used the .NET Core 3.1 SDK and the base image referred to in the Dockerfile is tagged with 3.1.
Save the Dockerfile file. The directory structure of the working folder should look like the following. Some of the deeper-level files and folders have been omitted to save space in the article:
From your terminal, run the following command:
Docker will process each line in the Dockerfile. The
. in the
docker build command tells Docker to use the current folder to find a Dockerfile. This command builds the image and creates a local repository named counter-image that points to that image. After this command finishes, run
docker images to see a list of images installed:
Notice that the two images share the same IMAGE ID value. The value is the same between both images because the only command in the Dockerfile was to base the new image on an existing image. Let's add three commands to the Dockerfile. Each command creates a new image layer with the final command representing the counter-image repository entry points to.
COPY command tells Docker to copy the specified folder on your computer to a folder in the container. In this example, the publish folder is copied to a folder named App in the container.
WORKDIR command changes the current directory inside of the container to App.
The next command,
ENTRYPOINT, tells Docker to configure the container to run as an executable. When the container starts, the
ENTRYPOINT command runs. When this command ends, the container will automatically stop.
From your terminal, run
docker build -t counter-image -f Dockerfile . and when that command finishes, run
Each command in the Dockerfile generated a layer and created an IMAGE ID. The final IMAGE ID (yours will be different) is cd11c3df9b19 and next you'll create a container based on this image.
Create a container
Now that you have an image that contains your app, you can create a container. You can create a container in two ways. First, create a new container that is stopped.
docker create command from above will create a container based on the counter-image image. The output of that command shows you the CONTAINER ID (yours will be different) of the created container. To see a list of all containers, use the
docker ps -a command:
Manage the container
The container was created with a specific name
core-counter, this name is used to manage the container. The following example uses the
docker start command to start the container, and then uses the
docker ps command to only show containers that are running:
docker stop command will stop the container. The following example uses the
docker stop command to stop the container, and then uses the
docker ps command to show that no containers are running:
Connect to a container
After a container is running, you can connect to it to see the output. Use the
docker start and
docker attach commands to start the container and peek at the output stream. In this example, the Ctrl+C keystroke is used to detach from the running container. This keystroke will end the process in the container unless otherwise specified, which would stop the container. The
--sig-proxy=false parameter ensures that Ctrl+C will not stop the process in the container.
After you detach from the container, reattach to verify that it's still running and counting.
Delete a container
Dinghy Vs Docker For Mac Windows 10
For the purposes of this article you don't want containers just hanging around doing nothing. Delete the container you previously created. If the container is running, stop it.
The following example lists all containers. It then uses the
docker rm command to delete the container, and then checks a second time for any running containers.
Docker provides the
docker run command to create and run the container as a single command. This command eliminates the need to run
docker create and then
docker start. You can also set this command to automatically delete the container when the container stops. For example, use
docker run -it --rm to do two things, first, automatically use the current terminal to connect to the container, and then when the container finishes, remove it:
The container also passes parameters into the execution of the .NET Core app. To instruct the .NET Core app to count only to 3 pass in 3.
docker run -it, the Ctrl+C command will stop process that is running in the container, which in turn, stops the container. Since the
--rm parameter was provided, the container is automatically deleted when the process is stopped. Verify that it doesn't exist:
Change the ENTRYPOINT
Dinghy Vs Docker For Mac Pro
docker run command also lets you modify the
ENTRYPOINT command from the Dockerfile and run something else, but only for that container. For example, use the following command to run
cmd.exe. Edit the command as necessary.
In this example,
ENTRYPOINT is changed to
cmd.exe. Ctrl+C is pressed to end the process and stop the container.
In this example,
ENTRYPOINT is changed to
exit command is run which ends the process and stop the container.
Docker has many different commands that create, manage, and interact with containers and images. These Docker commands are essential to managing your containers:
Clean up resources
During this tutorial, you created containers and images. If you want, delete these resources. Use the following commands to
Docker For Mac Download
List all containers
Stop containers that are running by their name.
Delete the container
Dinghy Vs Docker For Mac Pro
Next, delete any images that you no longer want on your machine. Delete the image created by your Dockerfile and then delete the .NET Core image the Dockerfile was based on. You can use the IMAGE ID or the REPOSITORY:TAG formatted string.
docker images command to see a list of images installed.
Docker For Mac
Image files can be large. Typically, you would remove temporary containers you created while testing and developing your app. You usually keep the base images with the runtime installed if you plan on building other images based on that runtime.