require-dockerfile-from-instruction

Require Dockerfiles to declare a FROM instruction.

Targeted pattern scope

• Repository-root Dockerfile instruction set.

What this rule reports

This rule reports Dockerfiles missing any FROM statement.

Why this rule exists

A valid Docker build must declare a base image stage. Enforcing FROM avoids broken or ambiguous image definitions.

❌ Incorrect

WORKDIR /app
CMD ["node", "server.js"]

✅ Correct

FROM node:22-alpine
WORKDIR /app
CMD ["node", "server.js"]

When not to use it

Disable this rule only if Dockerfile generation guarantees FROM elsewhere.

Rule catalog ID: R105

Further reading

• Dockerfile reference: FROM