Updated May 2019 to be much more comprehensive than the original September 2015 version A little backgroundDocker, to build containers kubectl, to get information about your cluster A local Kubernetes cluster (on macOS and Windows, Docker for Desktop works for.Docker for Mac (Docker Desktop) Docker for Mac requires that you’re running Mojave 10.14+ or newer with an Intel CPU. The filesystem sharing maps OSX volumes seamlessly into the Linux. You just drag-and-drop the Mac application to /Applications, run it, and the Docker CLI just works. Docker for Mac is a native MacOS X application that embeds a hypervisor (based on xhyve), a Linux distribution and filesystem and network sharing that is much more Mac native.In order to work and do its magic, the.Docker Desktop is the easiest way to get started with either Swarm or Kubernetes. The tool works by client commanding the daemon. This is pretty useful because you might have some legacy apps running in Vagrant / VirtualBox to deal with (I know I do).The motivation for the original version of this article was to flag Docker as a possible solution to:Docker has two key components: the docker daemon and the docker client.
How Docker Works Mac Requires Thatthe problem of installing OpenFOAM® on anything other than a mainstream Linux distribution I think docker just released a Mac Silicon version. Alternatively, I could have downloaded that. After that has happened, you continue to run the Docker commands you’re used to, but now they are executed on a cluster by a swarm manager.Gradle - Works, but the output fallback to legacy mode. Performance Comparison: Docker vs. What problem does Docker solve for CFD? What is Docker? Why is it useful for CFD? What is it good/not-so-good for? And, most importantly, how do you actually use it? That’s what I hope this updated version might achieve. But I think there’s still some confusion about using OpenFOAM with Docker. make it easier to work with several different versions (&/or different releases) of OpenFOAM on the same machineSince then, both OpenCFD & The OpenFOAM Foundation have started distributing Docker-ised versions of their respective releases, easing these issues. How do I add some other package to the container? How do I add my favourite text editor to the container? Can I keep them or do I have to re-do them every time? I’ve made some changes to my container. How do I get my data into & out of the container? Building your own OpenFOAM Docker image all machines had the same CFD environment (identical OpenFOAM releases, OS versions & other software tools) It would be pretty helpful to me if… Meaning you can install OpenFOAM on Windows as easily as you can on Linux (especially if you’re running the Foundation version & using their Ubuntu packs).But if you want to run OpenFOAM on multiple operating systems with a high-degree of confidence that they’re all running the same version of the code and that they’ll all behave consistently, then perhaps Docker could be useful?I typically run OpenFOAM on macOS, and on AWS instances running Ubuntu Linux. A feature that lets you run Linux command-line tools alongside your usual Windows programs. Not impossible, but not ideal, particularly if you were just looking to take OpenFOAM for a quick spin.On Windows that problem has largely gone away with the introduction of the Windows Subsystem for Linux. Back then, running OpenFOAM on Windows, macOS (or even a niche Linux distribution) involved virtual machines, patching &/or compiling from source or using an unofficial port. ![]() Why not just use a virtual machine?We could get broadly the same effect using a virtual machine running Linux. Reducing system administration time and increasing confidence that everything will work (just about) everywhere□. What problem does Docker solve for CFD?The number one benefit of Docker for CFD is how easy it becomes to provide identical, isolated CFD environments on any platform or operating system. And, as the Docker Engine can be installed on almost any infrastructure, your container can be used, without modification, almost anywhere.So, by packaging your CFD environment (OpenFOAM & whatever other tools you may need) into a container you can, thanks to Docker run OpenFOAM pretty much anywhere. ![]() Need to share your exact CFD environment with a client so that they can do some runs themselves? No problem — email them the Dockerfile & away they go. Being plain-text it’s readable, understandable, sharable, archivable, version controllable and easily edited. This is the recipe that describes the ingredients & the steps required to create the contents of a container. Mac finder preview thumbnails not displaying for cloud dropboxIsolated — Containers are effectively self-contained sandboxes. So, no waiting for your virtual machine to boot or leaving it running just in case you want to access it quickly. Quick Start — Docker is architected in such a way that starting a process in a container is almost instantaneous. This is the main reason why it probably isn’t the approach for someone looking to juice the last drops of crunch power from their system.As a very simple illustration, I timed the execution of the standard motorbike tutorial in OpenFOAM v6. NativeBut, surely the performance takes a hit when running OpenFOAM in a container, doesn’t it?Docker introduces an additional interface between our code & the underlying system resources on Windows & Mac (less so on Linux) which can reduce performance. Plus, you can update or modify any one of those different versions completely independent of the others.Performance Comparison: Docker vs. Here are some options for getting started. Installing OpenFOAM via DockerInstalling OpenFOAM can be ridiculously easy with Docker - it can also be ridiculously complicated & frustrating if you’re not familiar with it. The takeaway here is not who won, but that the performance gap can be negligible. Foundation Ubuntu package running natively = 5m 13sSurprised? Me too. Search the online Docker repository ( Docker Hub) for an OpenFOAM image Open a new terminal window & see if Docker’s there Download & Install Docker Community Edition OpenFOAM Foundation - Installation InstructionsInstallation is really only half of the story. Do OpenFOAM-y things in your new container, just to show it workedThe “5 mins” bit depends on your internet connection, but you can get the idea from the more-or-less realtime animation below.Both OpenCFD & The OpenFOAM Foundation use Docker to package releases for Windows, Mac and other Linux versions.Their approaches vary slightly, but you can find their detailed installation & usage instructions here: docker container run -ti cfdengine/openfoam These scripts setup how we access them and determine how we work with them. Hence the official OpenFOAM Docker versions (from The OpenFOAM Foundation & OpenCFD) have “helper” scripts to start the containers. Most of this functionality is down to how the image was built (using this Dockerfile).An OpenFOAM Docker image that was built differently will need to be used differently. That drops us into a new BASH shell, as a user called “foam”, with access to all of the codes within the container (a minimal Ubuntu install with OpenFOAM v6 but no ParaView). So, before we go on to show you how to use OpenFOAM via Docker, you need to understand a little bit more about containers and how their images are built.Terminology primer - you run a container, which is created from an image which was built from a Dockerfile (or it should’ve been □).Here’s our command from our 5-min install:Docker container run -ti cfdengine/openfoamRunning this fetches my simple OpenFOAM image from Docker Hub and starts a container on our local machine.
0 Comments
Leave a Reply. |
Details
AuthorJessica ArchivesCategories |