DL3048.md

Pattern: Invalid label key

Issue: -

Description

Not all strings are supported as label keys.

Example of incorrect code:

LABEL +?not..valid--key="foo"

Example of correct code:

FROM ubuntu:20
RUN wget --progress=dot:giga https://example.com/big_file.tar

LABEL valid-key.label="bar"

Further Reading

• docker docs - Docker object labels
• Hadolint - DL3048