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The Twelve-Factor Container (by Casey West)

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Published on Nov 14, 2016

Recording of Casey West's presentation "The Twelve-Factor Container: Designing Containers for Repeatability, Reliability and Portability" at ContainerDays NYC 2016 on Nov 3rd, 2016.
Slides:
https://speakerdeck.com/caseywest/abs...
Event: http://dynamicinfradays.org/events/20...

Adam Wiggins' seminal essay "The Twelve-Factor App" is widely considered canon for building cloud-native applications. Casey will examine how the twelve factors manifest in a container world, and will discuss their implications for what you can and cannot do with containers if you want to maintain repeatability, reliability, and portability.

Containers rose in popularity on an oft used metaphor: lightweight virtual machines. The idea of even more efficient resource utilization makes sense. Unfortunately, it's a problematic metaphor.

There is overlap in ideal capabilities between VMs and containers but it isn't complete. Containers represent a constrained set of capabilities compared to virtual machines in order to make fine-grained guarantees about resource constraints and process isolation. Newcomers to the container ecosystem begin with a "lightweight VM" understanding and fall victim to specific anti-patterns.

Casey will examine these anti-patterns and other common pitfalls in containerization and will describe how you can avoid them - a discussion relevant both for developers who wish to gain greater understanding of the environment their applications are deployed to, and operators interested in the benefits of containers for their architecture.

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