I'm trying to install docker into a server that has freebsd OS, the version of freebsd is 10.3-RELEASE-p17. I want to know if docker is compatible with this version of freebsd and also how can I install it?
Thanx in advance.
Docker won't work of FreeBSD(at least as of now). Docker was built built for Linux- it uses the isolation features of the linux kernel. There have been ongoing efforts to have a working port but there's nothing concrete(for the past 9 months). If you'd want to run docker, you'd have to use a VM and run docker from that VM using docker-machine(which is ports). I've mentioned virtualbox because it's supported by docker-machine.
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I am interested in creating a Docker image from Ubuntu 16.04 (Kernel 4.15.0-29-generic) to be run on a CentOS 6.9 (Kernel 2.6.32-696.30.1.el6.x86_64).
Are they compatible to run smoothly?
Thank you for your help!
CentOS 6 will not run any version of Docker "smoothly"; the last Docker version that even has a build for CentOS 6 is very old and even then there are kernel compatibility issues. I'd update your host to something newer.
Once you get past that, there aren't usually any substantial issue running different Linux distributions between the host and in containers. You'll routinely see hosts running very minimal distributions (for instance there isn't much in the boot2docker distribution that Docker Machine VMs use), and images frequently run very light-weight distributions such as Alpine or even have nothing resembling a "Linux distribution" at all.
I have a solution that includes about 5 containers. Most of them are alpine linux based, but one has to be a windows container. Unfortunately, the windows container relies on one of the linux containers for authentication and must be able to run alongside it. I am trying to set things up so I can develop locally with both containers running at the same time but I am having some trouble. Is it possible to run both Windows and Linux containers simultaneously on a Windows 10 Pro host using Docker for Windows (Hyper-V version)?
Essentially what I am looking for is the equivalent of running a docker compose file with both linux and windows containers in it (although everything I have researched says this isn't possible).
It looks like docker edge version 18.02 has the ability to run windows and linux containers next to each other using LCOW (Linux Containers on Windows). It hasn't made it into docker-compose yet, but I think it will very soon. Can't wait for the stable version to have this!
I've read that:
Docker is a system for management and deployment of application containers, not operating system containers.
However, in several resources (e.g. around 1:20 into https://www.youtube.com/watch?v=pGYAg7TMmp0) it gives an example of "problems" you might encounter if you've developed a web application on a Windows PC or Mac, and are deploying it to a Linux server.
So, how does Docker help in this situation? If we take a web application I understand Docker could help you make a container with the source, and say a specific version of PHP. But could you specify a target OS for it to run on, if it's different from the server that Docker is running on?
The Docker FAQ (https://docs.docker.com/engine/faq/) says
You can run both Linux and Windows programs and excutables in Docker containers.
Does this mean you need Docker installed on a Linux and Windows machine separately to do this, or is it possible to specify any OS within your Docker image and have any machine run it?
Please can someone explain how - or if - Docker deals with specifying a particular OS for your application?
Docker started as a way to run containers on Linux hosts, and this remains the dominate target for docker containers. Developer environments include an embedded VM to run Linux under the covers on Mac and Windows. Originally this was VirtualBox, but newer releases use xhyve and hyperv. The host OS in all of these are Linux so you are not building your image on one OS and running it on another OS.
Since that start, Docker has expanded target OS's. This requires that you have a docker installation for that OS, and it requires that your image be designed to run on that architecture/OS. This started with other architectures of Linux like arm64, and now zLinux. The Microsoft partnership is a rather large rewrite, partially in Windows itself, but also in the Docker code, and especially in the images designed to run natively on Windows. To run these, you have to change the settings on Docker for Windows to run Windows containers instead of Linux containers, you cannot run them both concurrently on the same host. At present, running Windows binaries can only be done on a Windows host, Microsoft isn't shipping free VMs for Linux hosts. And as a new target platform, it still lags behind in features from the Linux hosts.
How do I run Datalab locally when it requires Docker (and Docker Toolbox is not supported as documented here: https://cloud.google.com/datalab/docs/quickstarts/quickstart-local)? The Docker website says Docker requires Windows 10 Professional or Enterprise 64-bit, and most corporate environments don't run Windows 10.
Docker is highly preferred over Docker Toolbox, as its a simpler, self-contained installation, with simpler configuration (since you don't have additional virtualization software to deal with, as you do with Docker Toolbox - namely boot2docker and its underlying functionality). However if you have a setup to run docker on your end, you should theoretically be able to use that for running the Datalab docker container by adapting the instructions.
You do have the option of running everything on a GCE VM.
I was facing the same problem, what I found more comfrotable in the end is to install Ubuntu on Virtual Box. This is free and fairly easy, and from the virtual machine you can use all the Docker and the Google guide to run Datalab locally.
I have a following scenario:
Windows 7 machine, with an ubuntu virtual machine through virtual box.
I want to know what are the best options for running docker inside the ubuntu?
Can I just install the docker to the ubuntu? Or should I use docker-machine?
The official specs left me confused by saying:
Machine is currently the only way to run Docker on Mac or Windows
So according to that, it would mean I do need the docker-machine, since my base system is Windows?
Why couldn't I just install docker to the virtual machine ubuntu, and use it directly there?
I believe you can but haven't tried this myself. The comment about Docker Machine is related to not being able to run Docker directly on the Windows OS. Docker Machine is spinning up a headless Virtualbox instance of boot2docker with a convenient cli to access it.