Docker Training Ahmedabad

Docker Training Ahmedabad

Docker is open source software to pack, ship and run any application as a lightweight container. Containers are completely hardware and platform independent so you don’t have to worry about whether what you are creating will run everywhere.

In the past virtual machines have been used to accomplish many if these same goals. However, Docker containers are smaller and have far less overhead than VMs. VMs are not portable as different VM runtime environments are very different. Docker containers are extremely portable. Finally, VMs were not built with software developers in mind; they contain no concept of versioning, and logging/monitoring is very difficult. Docker images, on the other hand, are built from layers that can be version controlled. Docker has logging functionality readily available for use.

 

Virtual Machines vs Docker

To expound on what I mean by how Docker allows you to get most benefits of VMs, let’s take a look at how they work.

Docker Training Ahmedabad

This is a diagram of how a traditional VM setup for running software applications is configured. The Hypervisor is the layer of your stack that’s doing the actual virtualization, in which it takes computing resources from the Host Operating System and use them to create fake virtual hardware that will be then consumed by Guest Operating Systems. Once you have the guest OSs installed, you can actually install your software applications, binaries, and libraries supported.

VMs are great for providing complete isolation of the Host OS, where if something goes wrong in an application or your guest OS, it won’t impact the host OS or screw up the other guest OSs. However, all this comes at a great cost, because ultimately the server that’s running the stack has to pay a huge amount of computing resources to the virtual app.

 

With Docker, you’d have a thinner stack:

dockerc

 

The sort of rule of thumb in the Docker world is to have one Docker container running on your server for each process in your stack. This isn’t a hard rule, but it’s a good one for people who are just starting out.

 

Docker Training Ahmedabad

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