While with containers, more things are shared. This is a simplified diagram on how VMs work (source: ). In a nutshell, VMs use hypervisor and each VM has it’s own OS while containers share OS and only separate libraries, bin, executables, etc. Docker’s What is Docker? page has a a neat comparison of containers with VMs. Each of them works in isolation and communicates with other services via a well defined interface (typically REST).ĭocker is one of the most popular implementations of containers. You can think of containers as virtual machines but with less footprint.Ĭontainers are great for micro services where you replace monoliths with many services.
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It allows you to share some of the OS resources while encapsulating the code and other concerns.
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We can do this from File->Preferences in Virtualbox.Container technology is one of the best options for software development and deployment. I hit this issue once in a while and the workaround is to delete the host-only interface in Virtualbox as mentioned in the link. If we want to reuse the environment later, we can just stop the VMs like below and restart it later. To cleanup the environment, we can do: docker-machine rm -f mh-keystore web and db Containers across the 2 hosts will be able to communicate with each other using the Overlay network. The above command will create Overlay network and create web Container in 1 host and db Container in another host.
We can simply do: docker-compose -x-networking -x-network-driver=overlay -project-name=counter up -d To deploy this multi-host application below: web:
eval $(docker-machine env -shell sh -swarm mhs-demo0) Swarm will take care of scheduling the Containers into 1 of the nodes based on the default scheduling logic. “mhs-demo0” and “mhs-demo1” are the 2 VMs with Docker engine and Swarm installed.Īfter this, we can set the environment to Swarm master and start deploying Containers. engine-opt="cluster-advertise=eth1:2376" \Ĭonsul runs in “mh-keystore” VM and is used as a key value store for the cluster nodes to communicate to each other. engine-opt="cluster-store=consul://$(docker-machine ip mh-keystore):8500" \ swarm-discovery="consul://$(docker-machine ip mh-keystore):8500" \ Run the following script to setup a Consul server and 2 node Docker cluster with Swarm pre-installed: docker-machine create -d virtualbox mh-keystoreĭocker $(docker-machine config mh-keystore) run -d \ I have executed commands below from git bash shell.įollowing are the versions of Docker components that gets installed with Toolbox 1.9:ĭocker-machine.exe version 0.5.6, build 61388e9ĭocker-compose version 1.5.2, build e5cf49d.In this blog, I will use Docker CLI, so Kitematic is not needed.If you already have Virtualbox and Git bash for Windows, you can skip the installation of these 2. Docker Toolbox 1.9 version has the following components(Docker client, Docker machine, Virtualbox, Kitematic, Compose, Git).In this blog, I will provide the steps to create a simple environment to play with Docker engine, Swarm, Compose and Networking in Windows. I covered Toolbox in one of my earlier blogs. The easiest way to try out Docker is to use Docker Toolbox. This is not the same as running Docker engine in Windows, there is some active work going on to achieve this.
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Few folks recently asked me how to try out Docker in Windows machine to get familiar with Docker and Containers.