As a beginner in Docker or container, people always ask why I can't put all the application in a single container and deploy it to anywhere?
Well, technically you can but here are some considerations.
| Multiple Applications in Multiple Containers | Multiple Applications in a Single Container | |
|---|---|---|
| Isolation | Each application runs in its own environment | All applications share the same environment |
| Scaling | Different parts of an application can be scaled independently | All applications must be scaled together |
| Upgrades | One part of an application can be upgraded without affecting the rest | Upgrading one application may require restarting all applications |
| Reuse | Easier to reuse prebuilt images | Not as straightforward to reuse prebuilt images |
| Simplicity | Need to manage networking between containers | No need to manage networking between containers |
| Tightly-Coupled Processes | Not a concern if applications are loosely coupled | Might be a requirement if applications are tightly coupled |
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