Docker linux commands on windows

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Docker linux commands on windows

I'm first and foremost a Windows guy. But for a few years now, moving away from working mostly with .NET and into a plethora of open source technologies has given me the opportunity to change platforms and run a Linux-based system as my daily driver. Ubuntu, which I honestly love for work, has been serving me well by supporting my development workflow with languages like PHP, JavaScript and Ruby. And with the help of the excellent Visual Studio Code editor, I've never looked back. There's always been an inclination in the back of my mind though, to take some time and give Windows another shot. With the latest improvements coming to the Windows Subsystem for Linux with its second version, the new and exciting Windows Terminal, and Docker support for running containers inside WSL2, I think the time is now. In this post, we'll walk through the steps I took to set up a PHP development environment in Windows, running in a Ubuntu Docker container running on WSL 2, and VS Code. Let's go. Note: You have to be on the latest version of Windows 10 Pro (Version 2004) in order to install WSL 2 by the usual methods. If not, you'd need to be part of the Windows Insider Program to have access to the software. What's new with WSL 2 This is best explained by the official documentation. However, being a WSL 1 veteran, I'll mention a few improvements made which have sparked my interest in trying it again. 1. It's faster and more compatible WSL 2 introduces a complete architectural overhaul. Now, Windows ships with a full Linux Kernel which WSL 2 distributions run on. This results in greatly improved file system performance and much better compatibility with Linux programs. It's no longer running a Linux look-alike, but actual Linux. 2. It's better integrated with Windows This is a small one: we can now use the Windows explorer to browse files within a WSL distribution. This is not a WSL 2 exclusive feature, it has been there for a while now. I think it's worth mentioning though, because it truly is a great convenience and a far cry from WSL's first release, where Microsoft specifically advised against manipulating WSL distribution file systems from Windows. If nothing else, this makes WSL feel like a first class citizen in the Windows ecosystem and shows that Microsoft actually cares about making it a good experience. 3. It can run Docker I've recently been learning more and more about Docker and it's quickly becoming my preferred way of setting up development environments. Due to its lightweightness, ease of use, repeatability, and VM-like compartmentalization, I find it really convenient to develop against a purpose-built Docker container, rather than directly in my local machine. And with VS Code's Remote development extension, the whole thing is very easy to set up. Docker for Windows now supports running containers within WSL, so I'm eager to try that out and see how it all works. 4. A newer version means several bugfixes Performance notwithstanding, WSL's first release was pretty stable. I did, however, encounter some weird bugs and gotchas when working with the likes of SSH and Ruby during certain tasks. It was nothing major, as workarounds were readily available. I've already discussed some of them here, so I won't bother mentioning them here again. But thanks to the fact that the technology has matured since last time I saw it, and considering the architectural direction it is going in, I'm excited to not have to deal with any number of quirks. The development environment Ok, now with some of the motivation out of the way, let's try and build a quick PHP Hello World app running in a Docker container inside WSL 2, make sure we can edit and debug it with VS Code, and access it in a browser from Windows. Step 1: Install WSL 2 and Ubuntu Step 1 is obviously to install WSL and a Linux distribution that we like. Microsoft's own documentation offers an excellent guide on how to do just that. But in summary, we need to: Enable the "Windows Subsystem for Linux" and "Virtual Machine Platform" features by running these on an elevated PowerShell: dism.exe /online /enable-feature /featurename:Microsoft-Windows-Subsystem-Linux /all /norestart dism.exe /online /enable-feature /featurename:VirtualMachinePlatform /all /norestart Restart your machine. Set WSL 2 as the default version with: wsl --set-default-version 2, also from PowerShell. Install your desired distribution from the Microsoft Store. I chose Ubuntu 20.04 LTS. After installing, open the "Ubuntu 20.04 LTS" app from the Start menu and it should come up with a command line console. Wait for it to finish installing. It should prompt for a username and password along the way. Choose something you won't forget. Optionally, you can install the Windows Terminal app to get a better command line experience. Windows Terminal can be used to interact with PowerShell and the classic CMD, as well as with our WSL distributions. Step 2: Install Docker Installing Docker is very straightforward. Just download the installer for Docker Desktop for Windows, execute it, and follow the wizard's steps. Make sure that during setup the "Use the WSL 2 based engine" option is selected. In most cases, the installer will detect WSL 2 and automatically have the option selected. Follow the official instructions for more details on the process, but it really is that simple. Step 3: Install some useful VS Code extensions Our objective is to create a new development environment inside a Docker container and connect to it directly with VS Code. To do that, we use a few useful extensions: Step 4: Create the development container The extensions that we installed will allow us to use VS Code to work on code from within our WSL Ubuntu as well as from the container. Specifically, we want to connect VS Code to a container. There are a few ways to do this, but I will describe the one I think is the easiest, most convenient and "automagic" by fully leveraging the tools. Let's begin by opening a WSL Ubuntu terminal session, which will show something like this: Welcome to Ubuntu 20.04 LTS (GNU/Linux 4.19.104-microsoft-standard x86_64) * Documentation: * Management: * Support: ... kevin@kevin-thinkpad:/mnt/c/Users/kevin$ The project directory Let's change to our home, create a new directory for our new project, and change into it. $ cd $ mkdir php-in-docker-demo $ cd php-in-docker-demo Because we installed the Remote - WSL extension, we can open up this directory in VS Code with code .. Opening a terminal (Ctrl + `) in this VS Code instance opens WSL console, not Windows. The Dockerfile Now let's create a new file called Dockerfile which will define what our development environment image will look like. For a no-frills PHP environment, mine looks like this: # The FROM statement says that our image will be based on the official Ubuntu Docker image from Docker Hub: FROM ubuntu # Install packages, not allowing apt to ask any questions since we can't answer. ENV DEBIAN_FRONTEND=noninteractive RUN apt-get update && apt-get install -y software-properties-common php php-xdebug composer # Configure Xdebug so that the VS Code debugger can use it. RUN echo "xdebug.remote_enable=on" >> /etc/php/7.4/mods-available/xdebug.ini RUN echo "xdebug.remote_autostart=on" >> /etc/php/7.4/mods-available/xdebug.ini # The CMD statement tells Docker which command to run when it starts up the container. # Here, we just call bash CMD ["bash"] This script will later be used to create our development container. It will have PHP, Xdebug and Composer. This is all we need for our simple Hello World app. For more complex scenarios, other software like database clients or PHP extensions can be easily installed with additional RUN statements that call upon the apt package manager. Consider reading through Docker's official documentation on Dockerfiles to learn more. The configuration file Now, to leverage VS Code's capabilities, let's add a development container configuration file. In our current location, we need to create a new directory called .devcontainer and, inside that, a new file called devcontainer.json. I put these contents in mine: { // The name used by VS Code to identify this development environment "name": "PHP in Docker Demo", // Sets the run context to one level up instead of the .devcontainer folder. "context": "..", // Update the 'dockerFile' property if you aren't using the standard 'Dockerfile' filename. "dockerFile": "../Dockerfile", // Add the IDs of extensions you want installed when the container is created. // This is the VS Code PHP Debug extension. // It needs to be installed in the container for us to have access to it. "extensions": [ "felixfbecker.php-debug" ], // Use 'forwardPorts' to make a list of ports inside the container available locally. // When we run our PHP app, we will use this port. "forwardPorts": [5000], } A default version of this file can be automatically generated by running the "Remote-Containers: Add Development Container Configuration Files..." command in VS Code's Command Palette (Ctrl + Shift + P). The development container Now that we have all that in place, we can create our image, run our container, and start coding our app. Bring up the VS Code Command Palette with Ctrl + Shift + P and run the "Remote-Containers: Reopen in Container" command. The command will: Read the Dockerfile and create an image based on that. This is like running docker build -t AUTOGENERATED_IMAGE_ID . Run a container based on that image with the settings specified in .devcontainer/devcontainer.json. In our case, all it will do is enable the container's port 5000 to be accessible by the host. This is more or less like running: docker run -d -p 5000:5000 -v ${PWD}:/workspaces/php-in-docker-demo AUTOGENERATED_IMAGE_ID Open a new VS Code instance connected to the container with the /workspaces/php-in-docker-demo directory open. It will take a while, but after it's done, we will have a VS Code instance running directly in the container. Open the VS Code terminal with Ctrl + ` and see for yourself. It will show a prompt looking like this: root@ec5be7dd0b9b:/workspaces/php-in-docker-demo# You can for example, run php -v in this terminal, and expect something along these lines: PHP 7.4.3 (cli) (built: May 26 2020 12:24:22) ( NTS ) Copyright (c) The PHP Group Zend Engine v3.4.0, Copyright (c) Zend Technologies with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies This is PHP running, not in Windows, not in our WSL Ubuntu, but in the Docker container. Hello Windows + WSL 2 + Ubuntu + Docker + PHP + VS Code Let's now create our app. Add a new index.php file containing something silly like:

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