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Software Engineering Insights

Understanding Software Containers and their Orchestration

Nov 6, 2019 6:16:25 PM

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software containers

The modern approach to software development needs more focus on application than infrastructure. This has led to the introduction of new technologies and platforms that can help in the auto-management of infrastructure. One of the popular approaches that have gained ground in this concern is software containers. 

A container is a standard unit of software. It packages up code and all the dependencies so that an application can run in different computing environments, reliably. 

The upcoming segment discusses the need and role of containers in software development. Also, we will explore the benefits of containers over a virtual machine, understand what is container orchestration, and the platforms used for it. 

Role of Containers in Software Development 

While writing the application code, developers work on their local development environment. When the application build is pushed from staging to the production environment, the incompatibility in both environments creates trouble. The code that worked perfectly on the staging environment doesn’t work on the production server. This portability issue is generally accounted for the difference in Operating Systems, different libraries, and dependencies. 

Containers work around this portability issue. It separates the code from the underlying infrastructure that it runs on. Using the containerization approach, developers can package their code (including required bins and libraries) into a small container image, making it possible to run code in any other environment.  

Along with resolving this portability challenge, containers and their orchestration platforms have a number of advantages to offer over traditional virtualization. Let’s understand this. 

Why Containers Over Virtual Machines?

A virtual machine includes hardware, host OS, hypervisor, and a guest Operating System to host the application. The entire system will have all the necessary elements to run the apps- memory, storage, computing, hardware functionality, binaries & libraries. As this system scales, a separate guest OS and library have to be deployed, even though a similar application is replicated (App B and App C) in the picture below.

                         virtual machine

Virtual Machine

Containers create an abstraction at the OS level. It packages code and dependencies together. Since we don’t have to duplicate all dependencies and create loaded VMs, containers take up less space (container images are typically tens of MBs in size). 

It’s the container image that includes all the information to be executed at runtime on the OS, through a container engine. A containerized application can have multiple container images. For example, a 3-tier application that has a frontend, backend, and database will have 3 containers, each of which will execute independently. Containers do not retain session information and are inherently stateless. At a time, multiple instances of a container image can run simultaneously and if any of the instances fails, a new instance will be active as a replacement. 

                           Container
                                                                            Container

Container Orchestration: What it is and Why it is Needed? 

Container orchestration is provisioning, automating, and managing containers at a scale. It describes the way containers coordinate in their dynamic environments. There are a number of container-related tasks that can be automated through orchestration, which include, but are not limited to:

  • Configuration and scheduling of containers
  • Load balancing and traffic routing 
  • Securing interaction between containers
  • Resource allocation between containers
  • Monitor the health of containers etc. 

For this, there are container orchestration tools such as Docker Swarm and Kubernetes. These orchestration tools improve portability, accelerate deployment, decrease dependency errors, enhance security, and a lot more. 

Containers certainly have a significant role in modern software development. What according to you is the biggest advantage of containers? Share with us in the comments below. 

ALSO READ: A CTO's Guide to DevOps and its Services

 

Topics: DevOps

Archna Oberoi

Written by Archna Oberoi

Content strategist by profession and blogger by passion, Archna is avid about updating herself with the freshest dose of technology and sharing them with the readers. Stay tuned here as she brings some trending stories from the tech-territory of mobile and web.

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