Docker Security: Control Groups and Linux Capabilities

When running applications in production, securing your containerized environment is just as important as writing clean code. Without proper boundaries, a single compromised container can consume all host resources or gain unauthorized administrative access. This course provides a clear, text-based path to mastering the core Linux security mechanisms that keep your Docker containers isolated and secure. You will transition from running default, unrestricted containers to configuring highly secure, resource-constrained environments. By understanding how the underlying operating system limits processes, you will be able to protect your infrastructure from resource exhaustion attacks and privilege escalation. What you'll learn: - Understand the foundational security architecture of Docker containers and Linux namespaces - Configure Control Groups (cgroups) to limit CPU, memory, and swap usage - Apply Linux capabilities to restrict root privileges inside a container - Implement the principle of least privilege by dropping unnecessary system capabilities - Monitor container resource consumption to detect anomalies and potential security threats - Write secure Dockerfiles and compose files incorporating modern security best practices This course begins with essential security concepts and terminology, explaining how the Linux kernel isolates processes. From there, you will read through step-by-step configuration examples, learning how to apply resource constraints and drop capabilities in real-world scenarios. This course is designed for system administrators, DevOps engineers, and developers who are new to container security and want to build a solid foundation. No advanced security background is required, though basic familiarity with the command line and running simple Docker containers is helpful. Start reading today to build more secure, resilient containerized applications.