What is Docker Container? Function, Components, Benefits & Evolution

Docker‘ is a Platform set as a Service (PaaS) product intended to deliver software in the form of packages, which are termed as containers. It uses OS-level virtualization standards, wherein the kernel allows multiple instances of isolated user-space such as containers, partitions, zones, virtual kernels, etc.

These behave as real computers simulating the way programs are run in them. On a regular operating system, we see the resources the computer program is running. In containers, we can only see the contents and the devices allocated to the container when the programs are run in it.

For several developers in the industry today, Docker is the accepted standard for developing and sharing containerized apps, across the desktop and the cloud. Containers are a standardized unit of software. Developers use it to isolate an app from its environment. Due to their lightweight characteristics, several docker containers (typically above eight containers per host) can be run on a single server or VM, simultaneously.

#docker #docker architecture #docker container

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What is Docker Container? Function, Components, Benefits & Evolution

What is Docker Container? Function, Components, Benefits & Evolution

Docker‘ is a Platform set as a Service (PaaS) product intended to deliver software in the form of packages, which are termed as containers. It uses OS-level virtualization standards, wherein the kernel allows multiple instances of isolated user-space such as containers, partitions, zones, virtual kernels, etc.

These behave as real computers simulating the way programs are run in them. On a regular operating system, we see the resources the computer program is running. In containers, we can only see the contents and the devices allocated to the container when the programs are run in it.

For several developers in the industry today, Docker is the accepted standard for developing and sharing containerized apps, across the desktop and the cloud. Containers are a standardized unit of software. Developers use it to isolate an app from its environment. Due to their lightweight characteristics, several docker containers (typically above eight containers per host) can be run on a single server or VM, simultaneously.

#docker #docker architecture #docker container

Mikel  Okuneva

Mikel Okuneva

1602317778

Ever Wondered Why We Use Containers In DevOps?

At some point we’ve all said the words, “But it works on my machine.” It usually happens during testing or when you’re trying to get a new project set up. Sometimes it happens when you pull down changes from an updated branch.

Every machine has different underlying states depending on the operating system, other installed programs, and permissions. Getting a project to run locally could take hours or even days because of weird system issues.

The worst part is that this can also happen in production. If the server is configured differently than what you’re running locally, your changes might not work as you expect and cause problems for users. There’s a way around all of these common issues using containers.

What is a container

A container is a piece of software that packages code and its dependencies so that the application can run in any computing environment. They basically create a little unit that you can put on any operating system and reliably and consistently run the application. You don’t have to worry about any of those underlying system issues creeping in later.

Although containers were already used in Linux for years, they became more popular in recent years. Most of the time when people are talking about containers, they’re referring to Docker containers. These containers are built from images that include all of the dependencies needed to run an application.

When you think of containers, virtual machines might also come to mind. They are very similar, but the big difference is that containers virtualize the operating system instead of the hardware. That’s what makes them so easy to run on all of the operating systems consistently.

What containers have to do with DevOps

Since we know how odd happenings occur when you move code from one computing environment to another, this is also a common issue with moving code to the different environments in our DevOps process. You don’t want to have to deal with system differences between staging and production. That would require more work than it should.

Once you have an artifact built, you should be able to use it in any environment from local to production. That’s the reason we use containers in DevOps. It’s also invaluable when you’re working with microservices. Docker containers used with something like Kubernetes will make it easier for you to handle larger systems with more moving pieces.

#devops #containers #containers-devops #devops-containers #devops-tools #devops-docker #docker #docker-image

Docker Architecture Overview & Docker Components [For Beginners]

If you have recently come across the world of containers, it’s probably not a bad idea to understand the underlying elements that work together to offer containerisation benefits. But before that, there’s a question that you may ask. What problem do containers solve?

After building an application in a typical development lifecycle, the developer sends it to the tester for testing purposes. However, since the development and testing environments are different, the code fails to work.

Now, predominantly, there are two solutions to this – either you use a Virtual Machine or a containerised environment such as Docker. In the good old times, organisations used to deploy VMs for running multiple applications.

So, why did they started adopting containerisation over VMs? In this article, we will provide detailed explanations of all such questions.

#docker containers #docker engine #docker #docker architecture

Haylie  Conn

Haylie Conn

1623747973

Implementing Non-Trivial Containerized Systems: Picking Components

We’ll use Icecast, Liquidsoap, youtube-dl, and FFmpeg as the base components for creating our radio station.

So, you want to start a radio station, eh?

This is the first part of a multi-part series on designing and building non-trivial containerized solutions. We’re making a radio station using off-the-shelf components and some home-spun software, all on top of Docker, Docker Compose, and eventually, Kubernetes.
In this part, we’re going to explore how the different parts of the system interface with one another, to set the stage for our next post, where we Dockerize everything!

I first met Icecast (https://icecast.org/) when I worked at a web-hosting startup around the turn of the millennium. One night, one of my co-workers and I had the crazy idea to load a bunch of audio files on the networked file server and stream them to our workstations. We could listen to music while we worked 90+ hours a week. Strange times. After realizing it wasn’t as simple as exporting .ogg files over HTTP, we found Icecast (and its pal, Ices2) and built a rudimentary, local-network broadcast radio station.

#open source #cloud #tutorial #docker #containers #docker containers #docker container

Iliana  Welch

Iliana Welch

1597368540

Docker Tutorial for Beginners 8 - Build and Run C++ Applications in a Docker Container

Docker is an open platform that allows use package, develop, run, and ship software applications in different environments using containers.
In this course We will learn How to Write Dockerfiles, Working with the Docker Toolbox, How to Work with the Docker Machine, How to Use Docker Compose to fire up multiple containers, How to Work with Docker Kinematic, Push images to Docker Hub, Pull images from a Docker Registery, Push stacks of servers to Docker Hub.
How to install Docker on Mac.

#docker tutorial #c++ #docker container #docker #docker hub #devopstools