PG005: Inconsistent instruction casing
Info Best Practice
Why This Matters
Docker instructions are case-insensitive, but mixing uppercase and lowercase (e.g., FROM with run) creates an inconsistent, messy appearance. The Docker documentation and community convention is to use UPPERCASE for all instructions. Inconsistent casing makes the Dockerfile harder to scan and signals to reviewers that the file may not have been carefully maintained.
How to Fix
Use consistent uppercase for all Dockerfile instructions
Before (incorrect)
FROM node:20
run npm install
COPY . .After (correct)
FROM node:20
RUN npm install
COPY . .Rule Details
- Rule Code
- PG005
- Severity
- Info
- Category
- Best Practice