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Security · medium

5. Container Security and Runtime Limits

Reducing container privilege and blast radius.

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Run processes as a non-root user, use minimal images, scan dependencies, and provide only the Linux capabilities a service needs. Read-only root filesystems, dropped capabilities, and resource limits reduce the impact of a compromise or runaway process.

Containers are not a complete security boundary by themselves. Keep the host kernel patched, avoid mounting the Docker socket into untrusted containers, and treat secrets as runtime-managed values rather than image-layer files.

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Check your understanding

  1. 1. Why should production containers avoid running as root?

  2. 2. Where should application secrets generally be supplied?

  3. 3. What do CPU and memory limits protect against?

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