Explain the concept of a Sidecar container in Kubernetes architecture and its main purpose

A Sidecar container in Kubernetes is an additional container that runs alongside the main container in a single Pod and extends its functionality. It shares the network stack and volumes with the main container, allowing them to interact closely.

The primary purpose of a Sidecar is to perform auxiliary tasks such as:

• Logging and metrics collection
• Proxy servers or traffic routing services
• Updating configurations or certificates
• Caching or data synchronization

For example, if you have an application that writes logs, a Sidecar can collect these logs and send them to a centralized monitoring system without burdening the main container.