How can two containers in the same Pod communicate with each other (for example, client and database)?

In Kubernetes, two containers running in the same Pod can communicate with each other via localhost because they share the network namespace.

This means that if one container runs a database on a port, for example, 5432, the other container in the same Pod can connect to it at localhost:5432.

Example:

• The container with the database listens on localhost:5432
• The client container makes a request to localhost:5432

Additionally, containers in the same Pod can share volumes for file exchange.

Thus, communication between containers in the same Pod occurs through the local network interface and shared resources, simplifying interaction and reducing network overhead.