An Introduction To By Suren RodrigoConsultant, Software Product Engineering

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Application Servers, VMs, Containers, Docker….. What’s all the fuss about?

“It’s all about Applications”

We want a secure, isolated runtime environment for our applications to run.

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And then there were VMs….

> Initially we had 1 server running 1 application and the resource utilization efficiency was very poor.

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VMs are good, but….

> With VMs, We can run 1 application per VM, which is a huge improvement from 1 application per server model.

> But we still need a full blown OS and other heavy virtualization components to power up each VM.

> What we really want is just an environment to run our application. (Remember, it’s all about application)

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VMs OUT….Containers IN

> Container runs a super lightweight bare minimal OS environment.

> It shares a single kernel of the host. Hence, heavy lifting is done at host level.

> Much faster and easy to setup than a VM

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Why Containers are sooooo cool

> Each Container gets it’s own> Isolated File system> Isolated Process tree> Isolated network stack

“We get an isolated runtime environment for our applications to run. Without the

fuss of VMs”

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….ok…but, WHAT IS Docker?

> Docker is an implementation of the container technology we described earlier.

> Docker provides a way to run almost any application securely isolated in a container.

> Docker provide necessary tools for developers to simply manage application development and deployment.

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Why is this a big deal?

> As you can see, if it works locally, it works anywhere.

> Docker makes sure your container will run the same way anywhere the Docker engine is available.

> No More “It works on my machine” song

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It gets better…

> Docker images can be customized and each customized image can be “pushed” into a Docker registry (ex: Docker Hub) and others can “pull” the image and quickly setup the same environment in their local machines.

> Whole ecosystem is built on top of Docker with container discovery, registry and monitoring.

> Container Technology is at the heart of new software development architectures such as Microservices.

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Demo Time.

> Let’s build a image for our Node Microservices development work.

> Use that image to deploy our Microservices quickly.

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