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What you think about sandbox applications (like docker) over a PaaS can it mitigate a heterogeneous scenario?

Containers almost always for local dev environments. I don't recommend containers in production unless you're going all in on a container scheduler (like Kubernetes). Without running multiple containers on the same virtual machine (and and orchestrator performing the work for you), you're adding an additional layer of abstraction with no benefit.

Thanks for the reply, but can you explain (or provide some reference) about why not to use containers-only in production?

I know that I will add a layer of abstraction, however from a Dev perspective I have some benefit like a byte-to-byte compatible test/prod env that I haven't to worry about dependencies per example.

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