Answer
Docker embeds a DNS server inside each network; containers register by name for service discovery.
Quick Answer
Docker's embedded DNS server (127.0.0.11) resolves container names to IPs on user-defined networks. When a container's IP changes (on restart), Docker updates the DNS entry automatically. This works only on user-defined networks — containers on the default bridge use IPs directly, not names.
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