DL3021.md

Pattern: Missing / for COPY instruction

Issue: -

Description

If multiple <src> resources are specified, either directly or due to the use of a wildcard, then <dest> must be a directory, and it must end with a slash /.

Example of incorrect code:

FROM node:carbon
COPY package.json yarn.lock my_app

Example of correct code:

FROM node:carbon
COPY package.json yarn.lock my_app/

Further Reading

• Hadolint - DL3021
• Dockerfile reference - COPY