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Docker’s lightweight virtualization may supplant our hypervisor-backed VMs at some point in the future, and change the way that tomorrow's Ruby applications are architected, packaged and deployed. Using Docker, your Ruby applications will sit atop an excellent platform for packing, shipping and running low-overhead, isolated execution environments. You will get a brief intro to the Docker ecosystem, get to know the tools and processes needed to create containerized Ruby applications, and learn best practices for interacting with the Docker API from Ruby. Help us caption & translate this video! http://amara.org/v/Fp8l/
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In the RubyConf 2014 presentation titled "Containerized Ruby Applications with Docker," Laura Frank discusses the integration of Docker technology with Ruby applications. Docker, a lightweight virtualization tool, offers a user-friendly interface for creating isolated execution environments termed containers, which package applications with low overhead. The talk is structured around three core questions: what Docker containers are, how to use Docker with Ruby, and how to architect Ruby applications effectively using Docker. Key Points Discussed: - **Introduction to Docker**: Docker provides an efficient way to package applications utilizing existing components of the Linux kernel, simplifying the development process for Ruby applications. Laura emphasizes the importance of understanding Docker as a packaging tool and its limited scope, notably that it does not handle job scheduling. - **Container vs. Virtual Machine**: The efficiency of containers over traditional virtual machines (VM) is illustrated through the sharing of libraries and fast boot times, highlighting significant performance benefits. - **Technical Components of Docker**: Laura introduces core components that make Docker operational: libcontainer, namespaces, control groups (cgroups), and the union file system, which together provide a lightweight and effective runtime. - **Docker Ecosystem**: The talk explains the Docker Hub as a collaborative platform for sharing Docker images and resources, and how official repositories ease the process for developers. - **Using Ruby with Docker**: Instruction on using Docker with Ruby includes understanding Docker images and how to construct a Dockerfile. A live demonstration is given, where Laura builds a simple Ruby application container and runs it, emphasizing the ease and speed compared to a traditional VM setup. - **Best Practices and Architecture**: The discussion transitions to Docker’s architecture, which promotes a service-oriented approach. Best practices regarding the use of configurations, like avoiding hardcoded sensitive information in Dockerfiles and using environment variables during runtime, are noted. Application templating tools like Fig and Panamax are recommended for streamlining deployment. - **Conclusion and Recommendations**: Laura concludes the session by sharing valuable resources available at Docker Hub and tips on optimizing Docker usage for Ruby applications. She strongly encourages leveraging tools like Boot2Docker for improved development experiences and stresses the importance of using templating for efficient project kick-offs. The presentation offers a detailed introduction to Docker tailored specifically for Ruby developers, bridging knowledge gaps while showcasing practical applications and effective workflows.
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