A Kubernetes multi-container pod is a single Pod that contains multiple containers, which work together to achieve a common goal. These containers share the same network namespace, IP address, and storage volumes, enabling them to communicate easily and share data.

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Common Use Cases:

1. Sidecar Pattern: A helper container (e.g., logging, proxy) that enhances the main application.
2. Adapter Pattern: A container that translates or formats data for the main application.
3. Ambassador Pattern: A container that acts as a proxy between the main app and external services.

Key Features:

• Shared Network: Containers communicate via localhost.
• Shared Storage: Use shared volumes for data exchange between containers.
• Tightly Coupled Services: All containers in a Pod are managed as a single unit.

For example, a Pod might have:

• App Container: Runs the main app.
• Logging Container: Collects logs from the app and sends them to an external system.

This architecture simplifies deployment and operation of closely related containers.