Answer
Docker assigns DNS records per network; services resolve each other by name.
Quick Answer
Docker's embedded DNS server (127.0.0.11) answers name lookups inside containers on user-defined networks. When container "web" queries "db", Docker's DNS returns the IP of the container named "db". On the default bridge network this doesn't work — only user-defined networks get DNS resolution by service name.
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.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ