The Docker engine can be useful for lone developers who need a lightweight, clean environment for testing, but without a need for complex orchestration. If Docker is available on your system and everyone around you is familiar with the Docker toolchain, then Docker Community Edition ( docker-ce ) is a great way to get started with containers. Enterprise Edition (EE) While the Community Edition Docker is a free Docker platform and is mostly suited for individual developers and small organizations, the Enterprise Edition Docker comes with licensing cost and is suitable for business-critical production apps. Now that you have downloaded and installed the Portworx OCI bundle, you can use the px-runc install command from the bundle to configure your installation. The px-runc command is a helper tool that configures and runs the Portworx runC container. The following example shows how you can use px-runc to install Portworx:.

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Docker is a game-changer. But it is not a one-size-fits-all solution.There are many good things about Docker. It packs, ships, and runs applications as a lightweight, portable, and self-sufficient containerization tool. Docker is great for businesses of all sizes. When you are working on a piece of code in. Docker is proud to support the Open Source community. Qualifying OSS projects can get no-cost Docker accounts to support their contributors and end users.

As a developer, you have probably heard of Docker at some point in your professional life. And you're likely aware that it has become important tech for any application developer to know.

If you have no idea of what I'm talking about, no worries – that's what this article is for.

We'll go on a journey to discover what is this Docker everyone is talking about and what you can do with it. By the end, we'll also create, publish, and run our first Docker image.

But first, let's lay the foundation for our story. I'll be using this amazing article by Rani Osnat that explains the whole history of containers in more depth. And I'll summarize it here so we can focus on the important parts.

A Little Bit of Container History

Docker is a container runtime. A lot of people think that Docker was the first of its kind, but this is not true – Linux containers have existed since the 1970s.

Docker is important to both the development community and container community because it made using containers so easy that everyone started doing it.

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What are containers?

Containers, or Linux Containers, are a technology that allows us to isolate certain kernel processes and trick them into thinking they're the only ones running in a completely new computer.

Avast free silent install. Avast antivirus installation files. Online installer. This lightweight version of our installer only takes up a few MB of disk space. All other components are downloaded during installation, so an Internet connection is necessary. Offline installer. The complete installation package, usually larger than 200MB, containing all.

Different from Virtual Machines, a container can share the kernel of the operating system while only having their different binaries/libraries loaded with them.

In other words, you don't need to have whole different OS (called guest OS) installed inside your host OS. You can have several containers running within a single OS without having several different guest OS's installed.

This makes containers much smaller, faster, and more efficient. While a VM can take about a minute to spin up and can weigh several Gigabytes, a container weighs, on average, 400 to 600mb (the biggest ones).

They also take only seconds to spin up. This is mostly because they don't have to spin a whole operating system before running the process.

And this all began with six characters.

The beginning of containers

The history of containers begins in 1979 with Unix v7. At that time, I wasn't even born, and my father was 15 years old. Did containers already exist in 1979? No!

In 1979, the Unix version 7 introduced a system call called chroot, which was the very beginning of what we know today as processvirtualization.

The chroot call allowed the kernel to change the apparent root directory of a process and its children.

In short, the process thinks it's running alone in the machine, because its file system is segregated from all other processes. This same syscall was introduced in BSD in 1982. But it was only two decades later when we had the first widespread application of it.

In 2000, a hosting provider was searching for better ways to manage their customers' websites, since they were all installed in the same machine and competed for the same resources.

This solution was called jails, and it was one of the first real attempts to isolate stuff at the process level. Jails allowed any FreeBSD users to partition the system into several independent, smaller systems (which are called jails). Each jail can have its own IP config and system config.

Jails were the first solution to expand the uses of chroot to allow not only the segregation at the filesystem level, but also virtualizing users, network, sub-systems and so on.

In 2008, LXC (LinuXContainers) was launched. It was, at the time, the first and most complete implementation of a container management system. It used control groups, namespaces, and a lot of what was built until then. The greatest advancement was that it was used straight from a Unix kernel, it didn't require any patches.

Docker

Finally, in 2010, Solomon Hykes and Sebastien Pahl created Docker during the Y Combinator startup incubator group. In 2011 the platform was launched.

Originally, Hykes started the Docker project in France as part of an internal project within dotCloud, a PaaS company that was shut down in 2016.

Docker didn't add much to the container runtimes at the time – the greatest contribution from Docker to the container ecosystem was the awareness. Its easy-to-use CLI and concepts democratized the use of containers to common developers, and not only to deep hacking companies that needed containers for some reason.

After 2013, several companies started adopting Docker as default container runtime because it standardized the use of containers worldwide. In 2013, Red Hat announced a Docker collaboration, in 2014 it was time for Microsoft, AWS, Stratoscale, and IBM.

In 2016, the first version of Docker for a different OS than Linux was announced. Windocks released a port of Docker's OSS project designed to run on Windows. And, by the end of the same year, Microsoft announced that Docker was now natively supported on Windows through Hyper-V.

In 2019, Microsoft announced the WSL2, which made possible for Docker to run on Windows without the need of a virtualized machine on Hyper-V. Docker is now natively multiplatform while still leveraging Linux's container approach.

Finally, in 2020, Docker became the worldwide choice for containers. This happened not necessarily because it's better than others, but because it unifies all the implementations under a single easy-to-use platform with a CLI and a Daemon. And it does all of this while using simple concepts that we'll explore in the next sections.

How Does Docker Work?

Docker packages an application and all its dependencies in a virtual container that can run on any Linux server. This is why we call them containers. Because they have all the necessary dependencies contained in a single piece of software.

Docker is composed of the following elements:

a Daemon, which is used to build, run, and manage the containers
a high-level API which allows the user to communicate with the Daemon,
and a CLI, the interface we use to make this all available.

Docker Containers

Containers are abstractions of the app layer. They package all the code, libraries, and dependencies together. This makes it possible for multiple containers to run in the same host, so you can use that host's resources mo