05-Jun-2021 18:22:55 pm
Docker container. If you've attended any tech conferences or read industry publications over the years, you'll know that these words—'Docker' and 'container'—have seen increasing buzz. While the terms are often used interchangeably in software engineering and the IT space, they refer to two different things: Docker is an open-source platform used to build software packages called containers.
The use of Docker has increased in recent years. For the first time in its history, the 2019 Annual Stack Overflow Developer Survey included questions about Docker adoption and respondents ranked it the third most used platform after Linux and Windows. Although the technology of containers is seeing an increase, I find that the technology behind Docker is often misunderstood.In this blog, I will go over some common misconceptions about Docker containers, its benefits, and how Docker can be used with Kubernetes. You can find out more about Udemy in my course on Docker and Kubernetes: The Complete Guide.
Docker has become particularly useful in the DevOps process as a way to automate some of the manual tasks of a DevOps engineer. The DevOps role typically requires troubleshooting complex issues such as provisioning servers and configuring them to run software associated with your company's technology stack.A DevOps Engineer can write a unique configuration file for use on a single server, but with Docker the Engineer can write a single configuration and use it across multiple instances, avoiding cumbersome and manual configuration.
An example of Docker's use in industry is the music-streaming service, Spotify, which runs a microservices architecture with about 300 servers for each engineer on staff. This large number of microservices put pressure on the team's deployment pipeline. By implementing Docker, teams can move a container into their CI/CD pipeline.
Developers can guarantee that the container that passed the build and test process was the same as that used in production.
Containers Package everything you need to build and shipping an application through something called a "container image". This container image exists as a blueprint for executing the container and all its defined operating systems, language libraries, environment variables, and more. Multiple containers can be created using the same container image. . The container itself is a live computing environment whereas the image is a set of instructions to set up the computing environment. You can think of the container image as a cake recipe for a container cake.
Docker is the sandbox where developers can configure very specific dependencies, operating systems and libraries needed in a container for their applications and projects. The use of containers allows these configured packages to be used across computing devices. From your laptop to your coworker's laptop to a cloud server, a container ensures that they are all running on the same operating system and programs.
Across the board, the use of Docker and containers increases efficiency for both development and IT teams. When developing applications on their local machines, developers need to ensure that they have very specific versions of the software and tools they need for their projects and Docker helps with this. Specifically, those benefits include:
A term often used in conjunction with Docker is Kubernetes, an open-source platform originally developed by Google for the management and orchestration of containers. The most widely used implementations of Kubernetes are the Google Kubernetes Engine, running within Google's Cloud Engine, and Red Hat's OpenShift, popular for hybrid cloud uses.
Why use Kubernetes with Docker containers?
In the end, Docker should not be used as a single answer to each platform question. Many developers know that Docker is somewhat useful for server deployment and management, but it is not a one-stop-shop for all cases. Docker should be used for specific problems. Likewise, some of the benefits of Docker for development teams will not always translate to the specific needs of the project or your company. Like all technical solutions, this is one of many to consider.