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Containerfirst is a software development and deployment methodology that prioritizes the use of containerization technologies from the outset of a project. Instead of treating containers as an afterthought, containerfirst embeds them into the core design and architecture. This approach leverages the benefits of containerization, such as isolation, portability, and consistency, throughout the entire application lifecycle. Developers build and test applications within containers, ensuring that the runtime environment closely matches the production environment. This significantly reduces the "it works on my machine" problem. Deployment pipelines are designed to build and deploy container images directly, streamlining the release process. Infrastructure management often shifts towards orchestrators like Kubernetes or Docker Swarm to manage and scale containerized applications efficiently. The containerfirst philosophy encourages immutable infrastructure, where applications are deployed as new container images rather than updating existing ones. This promotes reliability and simplifies rollbacks. Key advantages include faster development cycles, improved deployment reliability, simplified scaling, and better resource utilization. It is a natural evolution for organizations adopting microservices architectures and seeking greater agility and operational efficiency.