Could you explain the internal mechanisms of Docker and how it manages containers?

Docker is a platform for building, shipping, and running applications in isolated containers. Internally, Docker uses Linux kernel features such as cgroups and namespaces to isolate processes and manage resources.

Main components and mechanisms:

• Images — templates for creating containers, containing the filesystem and configurations.
• Containers — running instances of images, isolated processes with their own namespace.
• Docker Engine — the server that manages images and containers.

When a container is started, Docker creates an isolated namespace for the process, limits resources via cgroups, and mounts the filesystem from the image. Containers operate as separate processes but use the host's kernel.

Thus, Docker manages containers by creating and controlling their lifecycle, ensuring isolation and efficient resource utilization.