Docker is not a good fit for applications that require stable, long-term data storage, very complex multi-container apps unless used with orchestration tools, or high-performance computing that demands direct hardware access. It struggles with software that uses graphics interfaces or low-level system controls. Tiny, simple apps can be affected by Docker’s overhead. Docker containers do not provide the same level of isolation as virtual machines, so they may not be secure enough for some sensitive workloads. Overall, Docker is limited in scenarios involving persistent storage, heavy computation, complex scaling without orchestration, or tasks requiring full system isolation.
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