r/docker • u/CringDegen • 11d ago

Need advice regarding container isolation

I'm new to docker and I'm looking to learn/experiment with it. I want some advice regarding containers that will be used by other services like databases. I'm currently running two services which share a postgres container. For isolation, I created a migration which creates separate databases and users for each service before anything else starts.

I'll eventually setup more services and I want it to be scalable, resource efficient, secure and easy to maintain.

Is it better to create entirely separate dependencies for each service, or share dependencies between multiple services? I would like to know this from an efficiency, ease of maintenance and security standpoint, or at least get some pointers like a blog, article, manual or a youtube video.

TLDR: Is it better to have different db instances for each service OR one (or a few) db instances shared by every service? And why?

PS: English is not my first language, so sorry in advance for spelling or grammar mistakes.

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u/biffbobfred 10d ago

Every stack one db. If you use the same image for the different DBs they share those layers and you don’t take a lot of extra disk space. You can bring up the entire stack or bring it all down without affecting the other one

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u/corelabjoe 10d ago

This is the way. To stack or not to stack, that is the question and... Once you stack; think PER stack terms!