Haraka's Storage Needs

[ptiseo-mcs]

I'm looking to create a scalable deployment of Haraka. While Haraka doesn't function as a mail store, I presume it maintains transient mail queues or files for messages in transit. So, how would that work in a containerized environment? What happens to messages if a container terminates unexpectedly? Would I need some form of shared file storage for mail queues across instances to prevent message loss during scaling events? Do I use a queue plugin, and all instances use it for transient needs?

[msimerson]

Most every containerized environment has some form of persistent storage. Those don't do, depend on other services that provide that persistence. There's a handful of ways one could deal with this. Here's a few that I've seen:

1. shared file system that persists across deployments
2. store all messages in a database (example: wildduck using mongodb)
3. save messages to a queue (like RabbitMQ)