DL3061: Dockerfile should start with FROM or ARG
Error Security
Why This Matters
A valid Dockerfile must begin with a FROM instruction (or ARG instructions before FROM for build-time variables). Any other instruction before FROM is invalid and will cause the build to fail. This rule catches structural errors early before they reach the build system.
How to Fix
Ensure FROM is the first non-ARG instruction
Before (incorrect)
RUN echo hello
FROM ubuntu:22.04After (correct)
FROM ubuntu:22.04
RUN echo helloRule Details
- Rule Code
- DL3061
- Severity
- Error
- Category
- Security