# Container Linux

> Linux distribution

**Wikidata**: [Q15984850](https://www.wikidata.org/wiki/Q15984850)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Container_Linux)  
**Source**: https://4ort.xyz/entity/container-linux

## Summary
Container Linux, also known as CoreOS, is a Linux distribution designed specifically for containerized applications, with a focus on simplicity and automation. It was created as a lightweight operating system optimized for running containers at scale.

## Key Facts
- Container Linux (also known as CoreOS) is a Linux distribution based on the Linux kernel.
- It was founded on October 3, 2013, and discontinued on May 26, 2020.
- The project was inspired by ChromiumOS and was affiliated with software engineer Kelsey Hightower.
- It was licensed under the Apache License and had its headquarters in San Francisco, United States.
- The distribution was replaced by Fedora CoreOS.
- It had a subreddit community (r/coreos) and was featured on Quora under the topic "CoreOS."

## FAQs
### Q: What is the main purpose of Container Linux?
A: Container Linux was designed as a lightweight operating system optimized for running containerized applications at scale.

### Q: When was Container Linux discontinued?
A: Container Linux was discontinued on May 26, 2020.

### Q: What was the inspiration for Container Linux?
A: Container Linux was inspired by ChromiumOS, with the goal of creating a minimal operating system for container deployment.

## Why It Matters
Container Linux played a significant role in the early adoption and standardization of container technologies by providing a minimal, automated operating system optimized specifically for container workloads. It addressed the challenge of managing complex container environments by simplifying the underlying infrastructure, making it easier for organizations to deploy and manage containers at scale. The project's focus on automation and simplicity helped establish patterns that influenced subsequent container operating systems and contributed to the broader adoption of containerization in enterprise environments.

## Notable For
- It was one of the first Linux distributions specifically designed for containerization, creating a minimal operating system optimized for running containers.
- The project was inspired by ChromiumOS, adapting its approach to create a lightweight container-focused OS.
- It introduced the concept of "etcd" as a core component for container orchestration and management.
- The distribution was known for its automated updates and self-healing capabilities, which were innovative for the time.
- It was developed with a focus on simplicity and automation, making it easier for developers and operations teams to manage containerized applications.

## Body
### Technical Foundation
Container Linux is a Linux distribution based on the Linux kernel and core GNU components, following the standard Linux distribution model. It was designed as a minimal operating system with a focus on containerization, removing unnecessary components to reduce complexity and improve performance for container workloads.

### Development and Timeline
The project was officially launched on October 3, 2013, with the first release marking the beginning of its development cycle. The distribution was developed by a team led by Kelsey Hightower, a software engineer and developer advocate. The project was inspired by ChromiumOS, which influenced its approach to creating a lightweight, automated operating system.

### Features and Architecture
Container Linux featured several key components designed for container management:
- **etcd**: A distributed key-value store used for service discovery and configuration management
- **Flannel**: A network overlay solution for container networking
- **Rkt**: A container runtime for running containers
- **CoreDNS**: A DNS service for container environments

The distribution emphasized automation through its "etcd" system, which provided self-healing capabilities and simplified cluster management. It also included tools for automated updates and system maintenance.

### Community and Support
The project maintained an active community through its subreddit (r/coreos) and had presence on platforms like Quora under the "CoreOS" topic. The distribution was supported by documentation and resources available on its website, which provided guidance for deployment and management.

### Transition and Legacy
Container Linux was discontinued on May 26, 2020, with the project being replaced by Fedora CoreOS. The transition marked the end of an era for the original CoreOS project, though the name and some concepts continued through the Fedora CoreOS initiative. The discontinuation reflected the evolution of container technologies and the consolidation of related projects within the broader Linux ecosystem.

## References

1. [Crunchbase](http://www.crunchbase.com/organization/coreos)
2. [Source](https://www.digitalocean.com/community/tutorials/an-introduction-to-coreos-system-components)
3. Quora