Answer
PID namespaces isolate process trees so containers cannot see each other’s processes.
Quick Answer
Docker uses PID namespaces to give each container its own process ID space. Inside the container, the main process is always PID 1. Processes in different containers have overlapping PID numbers that are completely separate — a PID 42 in container A has nothing to do with PID 42 in container B or the host.
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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