Hey everyone! I'm currently working on a web app that spans three different cloud accounts (AWS primary, AWS secondary, and Azure secondary), and each of these has two Kubernetes clusters running PostgreSQL in containers. My goal is to be able to switch deployments between accounts if we run out of credits or if there's a disaster. We're using ArgoCD for app deployments and Terraform for infrastructure management.
The main challenge I'm facing is keeping the database synchronized across accounts to ensure a smooth transition.
I'm considering a few replication options: native PostgreSQL logical replication, Bucardo, and SymmetricDS. My priorities are low risk of data loss, reduced operations complexity, and keeping costs reasonable. I have a few questions about this setup:
- For a multi-cloud, containerized PostgreSQL environment like this, which replication method would you recommend?
- Is real-time replication necessary, or is it overkill?
- Has anyone had experience with these tools in a multi-cloud Kubernetes context?
Thanks for any insights you can provide!
3 Answers
You're dealing with a tricky situation here—with both disaster recovery (DR) and credit-switching happening. For the replication part, I'd suggest going with the native PostgreSQL logical replication. It's reliable and doesn't add complexity like Bucardo or SymmetricDS.
You'll have to watch out for replication lag and any schema changes, but keeping it simple is often better. If your recovery point objective (RPO) is stringent, then real-time might be necessary; otherwise, going async could work fine for less critical apps. Just ensure that your replication layer stays independent of the Kubernetes lifecycle to avoid issues during pod restarts. Also, think carefully about whether credit-switching is worth the potential operational headaches it brings!
Honestly, the costs for setting this system could get pretty steep, and if AWS runs into major outages, none of it might matter. Sometimes, it's better to accept some downtime and just work through it. Evaluating the worth of the entire setup against potential risks is crucial here.
I suggest checking out Aurora Global for AWS if you're looking to replicate across regions. It simplifies the process of having a multi-region setup and can manage read replicas on the AWS side that can sync to Azure. It saves you from the complexity of managing the details yourself.
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