Multi-cloud deployments

When assessing the risks involved in running a service, it's easy to come to the realization that your organization is completely dependent on one cloud provider. A common desire to improve redundancy is to deploy services to multiple providers and spread the workload across Azure, GCP, Amazon, and others. This might seem like a great idea, but it also introduces a lot of complexity as different providers have different feature sets available, will need unique security arrangements, and be unable to share storage and secrets management.

While Terraform can help with this situation, it is often more achievable to aim for multiple regions within the same provider, and if several cloud providers are really required, to separate what's running in them based on how things interact. It's far easier to put a completely independent service somewhere else. There are parallels with the strategic approach and splitting a monolith into microservices...