Docker containers live in their isolated worlds, but they often need to communicate with each other and the outside world. Understanding Docker networking is crucial for building and managing distributed applications effectively. This guide explores the key concepts and commands, making Docker networking less intimidating.
Core Concepts: The Foundation of Docker Networking
- Container Networking Model (CNM): Docker employs the CNM to manage networks within containers. It comprises essential elements like:
- Sandboxes: Isolated units containing a container’s networking components, utilizing namespaces for separation.
- Endpoints: Connectors bridging sandboxes to networks, allowing multiple connections per sandbox.
- Networks: Collections of interconnected endpoints, enabling communication within a network segment.
- Docker Network Drivers: These handle the implementation of CNM concepts, translating high-level commands into actual network configurations. Docker offers various drivers for different deployment scenarios.
- IPAM Drivers: Responsible for allocating IP addresses and subnets within networks, ensuring no conflicts arise.
