Docker for Beginners

Written by:
Amelia Craig
Date Posted:
14 March 2019

You’ve probably heard of Docker, but do you understand it?

What is Docker?
Docker is a system designed to simplify and optimise the process of creating, deploying and running applications.

Docker Images and Containers
Software programs and applications are created as Docker images and then packaged into Docker containers – these containers include all the parts the program needs in order to run correctly.

Docker Platform
A Docker platform is required to run the Docker containers. A single server can run several Docker containers simultaneously. Containers are isolated from each other on the platform but share the Operating System (OS). Sharing the OS means that more resources, such as memory and processing power, can be devoted to the application itself.

A Developer will install their programs inside Docker images that specify their precise contents. A Docker image is a lightweight package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings. Docker images are like a template for an application.

The Docker platform contains a special OS that the containers run on, but this is not the same as a normal OS, it is a much lighter option. This set up means that containers can be run anywhere and each time it will be exactly identical, regardless of the infrastructure it’s running on.

Shared Operating System
Docker allows multiple programs that run in the containers to use the same OS.

The OS is the most important program that runs on a computer, as it makes it possible for other programs and applications to run. Docker technology creates powerful isolated multi-tenant environments, where containers can be deployed. Multi-tenanted environments allow multiple companies to share systems.

Benefits of Docker
Many developers provide their software packages in a Docker format using Docker images for portability. Containers have an image of the OS that they use and can run on any machine, even if the host OS is different. Container-based apps can easily be moved from physical servers to a cloud environment, or from a developer’s laptop to company servers without affecting how the application runs.

Another benefit of using Docker is its scalability, which means that systems or networks change in size in order to accommodate growth. Each container is given a fixed resource configuration: CPU, RAM, etc. This means that to scale an application you simply have to increase the number of containers. Because Docker images are generally small, deploying new containers is a rapid process, meaning you can scale your application almost instantly.

Find out more about Hyve’s Private Docker Platform by getting in touch with our sales team on 0800 612 2524, and read our ‘Is Docker the future?’ blog.

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