Answer
CRIU saves process state, TCP sessions, and memory; Docker restores it on another host.
Quick Answer
CRIU (Checkpoint/Restore In Userspace) freezes a running container, captures its full memory state and process tree to disk, then restores it on another host. Docker supports experimental CRIU integration for container live migration. It's used for zero-downtime maintenance, workload migration, and speeding up slow startup apps.
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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