Answer
cgroups enforce limits on CPU, RAM, I/O, and PIDs. Exceeding limits causes throttling or OOM kills.
Quick Answer
cgroups (control groups) are a Linux kernel feature that limits and monitors resource usage. Docker uses them to cap how much CPU, RAM, I/O, and network a container can consume. A container with --memory=512m cannot use more than 512MB of RAM — the kernel enforces it, not the app itself.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ