K8S Notes
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Networking
- Microservice Architecture and Network Communication:
- Microservice architecture relies heavily on network communication.
- Unlike monolithic applications, microservices implement interfaces for making requests.
- Example: A service providing a list of products in an e-commerce application.
- Network Namespaces and Unique IP Addresses:
- Each container in microservices has its unique IP address, facilitated by network namespaces.
- Allows multiple containers to open the same network port, enabling scenarios like multiple containerized web servers using port 8080.
- Port Mapping for External Accessibility:
- Containers can map a port from the container to a port on the host system.
- Facilitates external access to the application.
- Overlay Networks for Inter-Container Communication:
- Overlay networks enable communication between containers across hosts.
- Places containers in a virtual network spanning host systems.
- Simplifies communication without requiring complex networking and routing configurations by system administrators.
- Benefits of Overlay Networks:
- Facilitate easy communication between containers.
- Eliminate the need for intricate networking and routing setup.
- Most overlay networks handle IP address management automatically.
- Container Networking Standards - Container Network Interface (CNI):
- Most modern container networking implementations are based on the Container Network Interface (CNI).
- CNI is a standard enabling the creation and configuration of network plugins.
- Allows easy swapping of different plugins in various container orchestration platforms.
