Kubernetes Sidecar Container – Best Practices and Examples

Kubernetes Pods allow multiple containers to share the same network space and storage. One multi-container pattern is the sidecar container pattern, which separates concerns and keeps individual components isolated. Sidecar containers provide supplementary services or functionalities to support primary containers within a pod. Common use cases for sidecar containers include logging and monitoring, service discovery and load balancing, security and authentication, caching and content delivery, data synchronization and replication, and file watching and hot reloading. Implementing a sidecar container involves creating a ConfigMap API object to define the source of data and match what Fluentd should do with the data.