Gnanesh Kunal

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What are containers!!

“Have you ever come across people saying or found yourself saying, “It worked on my machine”? Well, Don't say you never said it, you did.”

“Of course, everyone does, when I want to transfer my project to a new machine, I usually fall into this trap. Don't you say it too?”

“Well, I was, but not these days.”

“So what should we do to stop saying it, there's any special Operating System Virtualization that works the same on every Machine?”

“Well again, there's no such thing that works fine on every Machine, but there are Containers.” “What are Containers, Actually?”

According to Wiki, Linux container is a generic term for an implementation of operating system-level virtualization for the Linux operating system.”

“I don't understand.”

“Containers are like lightweight Virtual Machines. Unlike VMs, containers do bundle a light-weight operating system with the only libraries and settings required to make the software work. This makes for efficient, lightweight, self-contained systems and guarantees that software will always run the same, regardless of where it's deployed. If you need a windows container, that exists too.”

“Can you talk a bit higher level than this?”

“Containers are a way to wrap up an application into its own isolated box. For the application in its container, it has no knowledge of any other applications or processes that exist outside of its box. Everything the application depends on to run successfully also lives inside this container. Wherever the box may move, the application will always be satisfied because it is bundled up with everything it needs to run.”

“So what about its kernel?”

“The Container-Manager shares the current System kernel.”

“Can you give me a basic working architecture?”

“Imagine a kitchen. We pack up all the appliances and furniture, the pots and pans, the dish soap and hand towels. This is our container

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We can now take this container and drop it into whatever host apartment we want, and it will be the same kitchen. All we must do is connect lectricity and water to it, and then we're clear to start cooking (because we have all the appliances we need!)

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In much the same way, containers are like this kitchen. There can be different kinds of rooms as well as many of the same kinds of rooms. What matters is that the containers come packaged up with everything they need. source: Microsoft

Hello there !

“Well, that's amazing!! Is that the only problem it solves ?”

“Tell me how do you deploy a full stack Web app, for example?”

“Creating Instances for each Service in the stack, Installing Operating System for each Service, Configuring runtime environments for each Service, Adding security layer for each Service, and so on. And, the last and crucial one is connecting each Service to each other”

“Well, All that takes is huge cost and time, right?”

“Yeah!! But it's worth the time, right?”

“What if it doesn't work the same?, And for example, if it's a Nginx server, the service that doesn't require much storage, affording it much storage wouldn't lead to a hardware wastage?, And each instance doesn't use 90% of the OS-library services, having all those unnecessary services in the instance would do any great? Would doing that be okay?”

“That's really not okay. Is there any better ways to do it?”

“There are better ways to do that in containers. You could build few containers, that your services need, and cluster them together while exposing only the service that needs to be exposed.”

“Are they portable?”

“Because the container has everything it needs to run your application, they are very portable and can run on any machine. You can create and test containers locally, then deploy that same container image to your private cloud, public cloud or service provider.”

“Is there any app language restrictions?”

“With containers, developers can build an app in any language. These apps are completely portable and can run anywhere --- laptop, desktop, server, private cloud, public cloud or service provider --- without any code changes.”

“So you're telling me containers, doesn't just solve installing; configuring; adding security; etc., but also solves hardware wastage?”

“Exactly!”

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