CV-M003: Undefined network reference
Error Semantic
Why This Matters
A service references a network that is not defined in the top-level networks section. Docker Compose will fail to start with an error when a service references an undefined network. Either add the network to the top-level networks section or fix the network name in the service definition. The implicit "default" network does not need to be declared.
How to Fix
Define the referenced network in the top-level networks section.
Before (incorrect)
services:
web:
networks:
- backend
# No top-level networks definedAfter (correct)
services:
web:
networks:
- backend
networks:
backend:Rule Details
- Rule Code
- CV-M003
- Severity
- Error
- Category
- Semantic