[Solved] You run a container with:docker run --memory-reservation=200m myappBut the container uses 300MB memory and is not killed. Why? | Docker

Docker - Resource Management

You run a container with:
docker run --memory-reservation=200m myapp
But the container uses 300MB memory and is not killed. Why?

ABecause Docker ignores memory-reservation without a memory limit.

BBecause memory-reservation is a soft limit and does not kill the container.

CBecause the container has unlimited memory by default.

DBecause the container is using swap memory instead.

Step-by-Step Solution

Solution:

Step 1: Recall memory-reservation behavior
Memory reservation is a soft limit; exceeding it does not kill the container.
Step 2: Understand absence of hard limit
Without a hard memory limit, container can use more memory than reservation.
Final Answer:
Because memory-reservation is a soft limit and does not kill the container. -> Option B
Quick Check:
Soft limit exceeded = no kill [OK]

Quick Trick: Soft limit exceeded is allowed unless hard limit set [OK]

Common Mistakes:

Master "Resource Management" in Docker

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