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Deep Dive into Docker Containers for Rails Developers by Christopher Rigor This is a sponsored talk by Engine Yard. Containers have gained popularity the past few years but they have been around much longer than that. In this talk, we'll dive into the internals of a container. If you have used or heard about Docker containers but are unsure how they work, this talk is for you. You’ll also learn how to run Rails in production-ready container environments like Kubernetes.
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This talk, titled "Deep Dive into Docker Containers for Rails Developers," presented by Christopher Rigor at RailsConf 2017 and sponsored by Engine Yard, explores the intricacies of Docker containers specifically for Ruby on Rails developers. Rigor begins by discussing the significance of containers in modern development, noting their growing popularity and the need to understand their internals for effective deployment in production environments. **Key Points:** - **Introduction to Containers:** Containers are described as lightweight alternatives to virtual machines that provide environment isolation using Linux kernel features—namespaces and cgroups. This allows developers to run applications in a controlled environment without the overhead of a full VM. - **Reasons for Using Containers:** Rigor lists several advantages, including the ability to scale applications easily, mitigate dependency issues, and enhance deployment velocity. For Rails developers, using containers can simplify the process of running applications across different environments and swiftly manage multiple server setups. - **Container Internals:** The talk dives into the internal mechanisms of containers, explaining how they are built using namespaces for process isolation and cgroups for resource management. Rigor emphasizes that containers are effectively processes that share the same host but operate in isolated environments. - **Practical Implementation:** Rigor outlines a suggested approach to deploying a Rails application within a container, involving setting up namespaces and applying resource limits to manage the application efficiently. He provides detailed examples, demonstrating how to configure network interfaces and manage dependencies within the container setup. - **Security Considerations:** Security is a vital topic, with Rigor discussing the importance of employing multiple layers of security. He covers the use of Linux security modules like AppArmor and SELinux, capabilities management, and the significance of namespace isolation to protect host resources. - **Running Containers in Production:** The talk concludes with insights into orchestration systems like Kubernetes, which automate the management of containers in production. Rigor highlights the need for developers to leverage established platforms to abstract the complexities of container management while still maximizing the advantages containers offer. In summary, Rigor inspires Rails developers to explore the container ecosystem, emphasizing the maturity of technologies available and encouraging the use of containers for building scalable, production-ready applications. While cautioning against running databases in containers due to potential risks, he advocates for deploying Rails applications within them to take advantage of their scalability and efficiency.
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