Can we manage multiple environments in a single EKS cluster?

You might want to look at the concept of hybrid clusters in EKS, which allows for some flexibility. However, managing workloads across multiple clusters can be tricky, particularly when it comes to network charges and configuration. If you're just after an easier management interface, consider tools like Rancher instead, as it can help you manage your clusters better without overcomplicating things.

When it comes to running multiple environments in EKS, the answer really depends on what you're trying to achieve. If you mean managing development and production in one cluster, that can get messy. You risk mixing sensitive workloads with dev activities, leading to potential security issues. It's often safer to keep these environments separate to avoid complications, especially with testing and network configurations. However, if you're just running different services, you can absolutely do that within the same cluster using namespaces and proper resource management. Just keep your dev and prod workloads distinct!

There are some advanced options like using virtual clusters, but they can be complicated to set up. I haven't tried implementing them myself, but check out vCluster for more info: https://www.vcluster.com/! It might give you some ideas on how to manage separate environments effectively.