Mastering Kubernetes - Second Edition

Ambassador pattern

The ambassador pattern is about representing a remote service as if it were local and possibly enforcing a policy. A good example of the ambassador pattern is if you have a Redis cluster with one master for writes and many replicas for reads. A local ambassador container can serve as a proxy and expose Redis to the main application container on the localhost. The main application container simply connects to Redis on localhost:6379 (Redis's default port), but it connects to the ambassador running in the same pod, which filters the requests, sends write requests to the real Redis master, and read requests randomly to one of the read replicas. Just as we saw with the sidecar pattern, the main application has no idea what's ...