this post was submitted on 20 Oct 2025
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If you properly divide your instances between providers and regions and use load balancing which uses a corum of 3 availability model then it can be zero downtime pretty fairly guaranteed.
People be cheap and easy tho, so π€·ββοΈ
Dividing between providers is not what people would be doing if the resilience of cloud services were as is being memed about.
Doing so is phenomenally expensive.
It's demonstrably little more expensive than running more instances on the same provider. I only say -little- because there is a marginal administrative overhead.
It's phenomenally expensive from a practical standpoint, it takes an immense amount of engineering and devops effort to make this work for non trivial production applications.
It's egregiously expensive from an engineering standpoint. And most definitely more expensive from a cloud bill standpoint as well.
We're doing this right now with a non trivial production application built for this, and it's incredibly difficult to do right. It affects EVERYTHING, from the ground up. The level of standardization and governance that goes into just making things stable across many teams takes an entire team to make possible.
In my experience using containers has removed requirements for additional engineering cost to deploy between providers because a container is the same wherever it's running, and all the providers will offer container hosting, and most offer cluster private networking.
Deployment is simplified using something like octopus which can deploy to many destinations in a blue-green fashion with easy rollback.
Yes, containers make your application logic work.
That's the lowest hanging fruit on the tree.
Let's talk about persistence logic, fail forwards, data synchronization, and write queues next.
Let's also talk about cloud provider network egress costs.
Let's also talk about specific service dependencies that may not be replicatable across clouds, or even regions.
Oh, also provider specific deployment nuances, I AM differences, networking differences....etc
Containers are nice, but don't really cover things like firewalls, network configuration, identity management, and a whole host of other things, the configuration of which varies between providers.
Only if you engineered your stack using vendor neutral tools, which is not what each cloud provider encourages you to do.
Then the adminstrative overhead of multi-cloud gets phenomenally painful.
This is why OpenTofu exists.
Yeah, Terraform or it's FOSS fork would be ideal, but many of these infrastructures are setup by devs, using the "immediately in front of them" tools that each cloud presents. Decoupling everything back to neutral is the same nightmare as migrating any stack to any other stack.
Definitely. I go through that same nightmare every time I have to onboard some new acquisition whose devops was the startup cfo's nephew.
Infrastructure is there to be used by apps/services. It doesnβt matter how itβs created if infrastructure across providers does not provide same API. You canβt use GCP storage SDK to call AWS s3. Even if API would be same, nothing guarantees consistent behavior. Just like JPA provides API but implementations and DBs behavior are inconsistent
You can use the S3 API to interop with basically every major provider. For most core components there are either interop APIs or libraries that translate into provider-native APIs.
It's 100% doable to build a provider-agnostic stack from the iac all the way up to the application itself.
The administrative overhead and the overhead of engineering everything to with multiple vendors is what is massive