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Wow, thank you so much for taking the time to answer. I really do appreciate it.
Going off of what you said, I am going to take what I currently have, scale it back, and attempt to get more separation between services.
Again, thank you!
Happy to help.
Containerization and virtualization can help with the separation of services - especially in an environment where you can't throw hardware at the problem. Containers like Docker/podman and LXD/LXC aren't "perfect" (isolation-wise) but do provide a layer of isolation between things that run in the container and the host (as well as other services). A compromised service would still need to find a way out of the container (adding a layer of protection). But they still all share the same physical resources and kernel so any vulnerabilities in the kernel would potentially be vulnerable (keep your systems up-to-date). A full VM like VirtualBox or VMWare will provide greater separation at the cost of using more resources.
Docker's isolation is generally "good enough" for the most part though. Your aggressors are more likely to be bot nets scanning for low-hanging fruit (poorly configured services, known exploits, default admin passwords, etc.) rather than targeted attacks by state-funded hackers anyway.