Well, I have two options for you. Option number 1 is do a manual install, which is quite easy to do. Option number 2 is to download my version of the module DockerMsftProvider and let it install Docker for you. Option 1: Manual install. The documentation of Docker EE contains a step-by-step instruction to use a script to install Docker EE. If you want even more features on VirtualBox than what Guest Additions offers then you will have to install VirtualBox Extension Pack. We have already showed you how to install VirtualBox on Ubuntu and Windows, install Guest Additions on Windows and Ubuntu, Setup Shared Folder, and Mount Shared folder on Ubuntu and Windows. Oct 19, 2019 Step 2: Get the VirtualBox. If you already have VirtualBox on your Windows or Ubuntu system then simply move to the next step, or just go to the www.virtualbox.org and download one as per your host operating system. Know more about VirtualBox installation. Step 3: Create Virtual Machine on VirtualBox. Click on New button.

Estimated reading time: 8 minutes

This Quickstart guide shows you how to use Docker Compose to set up and runa Rails/PostgreSQL app. Before starting, install Compose.

Define the project

Start by setting up the files needed to build the app. The app will run inside aDocker container containing its dependencies. Defining dependencies is done usinga file called Dockerfile. To begin with, the Dockerfile consists of:

Docker Install Virtualbox

That’ll put your application code inside an image that builds a containerwith Ruby, Bundler and all your dependencies inside it. For more information onhow to write Dockerfiles, see the Docker user guideand the Dockerfile reference.

Next, create a bootstrap Gemfile which just loads Rails. It’ll be overwrittenin a moment by rails new.

Create an empty Gemfile.lock to build our Dockerfile.

Next, provide an entrypoint script to fix a Rails-specific issue thatprevents the server from restarting when a certain server.pid file pre-exists.This script will be executed every time the container gets started.entrypoint.sh consists of:

Finally, docker-compose.yml is where the magic happens. This file describesthe services that comprise your app (a database and a web app), how to get eachone’s Docker image (the database just runs on a pre-made PostgreSQL image, andthe web app is built from the current directory), and the configuration neededto link them together and expose the web app’s port.



You can use either a .yml or .yaml extension for this file.

Build the project

With those files in place, you can now generate the Rails skeleton appusing docker-compose run:

First, Compose builds the image for the web service using the Dockerfile.The --no-deps tells Compose not to start linked services. Then it runsrails new inside a new container, using that image. Once it’s done, youshould have generated a fresh app.

List the files.

If you are running Docker on Linux, the files rails new created are owned byroot. This happens because the container runs as the root user. If this is thecase, change the ownership of the new files.

If you are running Docker on Mac or Windows, you should already have ownershipof all files, including those generated by rails new.

Now that you’ve got a new Gemfile, you need to build the image again. (This, andchanges to the Gemfile or the Dockerfile, should be the only times you’ll needto rebuild.)

Connect the database

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The app is now bootable, but you’re not quite there yet. By default, Railsexpects a database to be running on localhost - so you need to point it at thedb container instead. You also need to change the database and username toalign with the defaults set by the postgres image.

Replace the contents of config/database.yml with the following:

Dec 05, 2020 Docker for Mac (Docker Desktop) Docker for Mac requires that you’re running Mojave 10.14+ or newer with an Intel CPU. M1 support is on its way. You can run VirtualBox 6+ alongside Docker Desktop. This is pretty useful because you might have some legacy apps running in Vagrant / VirtualBox to deal with (I know I do!). A Docker Machine is a virtual machine running under VirtualBox in your host machine. We can use the Port Forwarding feature of VirtualBox in order to access the Docker VM as localhost. To achieve this do the following: First of all, make sure your Docker Machine is stopped by executing the following. Docker virtualbox mac

You can now boot the app with docker-compose up:

If all’s well, you should see some PostgreSQL output.

Finally, you need to create the database. In another terminal, run:

Here is an example of the output from that command:

View the Rails welcome page!

That’s it. Your app should now be running on port 3000 on your Docker daemon.

On Docker Desktop for Mac and Docker Desktop for Windows, go to http://localhost:3000 on a webbrowser to see the Rails Welcome.

Stop the application

To stop the application, run docker-compose down inyour project directory. You can use the same terminal window in which youstarted the database, or another one where you have access to a command prompt.This is a clean way to stop the application.

Restart the application

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To restart the application run docker-compose up in the project directory.

Rebuild the application

If you make changes to the Gemfile or the Compose file to try out some differentconfigurations, you need to rebuild. Some changes require onlydocker-compose up --build, but a full rebuild requires a re-run ofdocker-compose run web bundle install to sync changes in the Gemfile.lock tothe host, followed by docker-compose up --build.

Here is an example of the first case, where a full rebuild is not necessary.Suppose you simply want to change the exposed port on the local host from 3000in our first example to 3001. Make the change to the Compose file to exposeport 3000 on the container through a new port, 3001, on the host, and savethe changes:

Now, rebuild and restart the app with docker-compose up --build.

Inside the container, your app is running on the same port as before 3000, butthe Rails Welcome is now available on http://localhost:3001 on your localhost.

Install Docker Machine Virtualbox

More Compose documentation

Docker Install Virtualbox Settings

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