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399224 (9) [Avatar] Offline
You can't put #comments at the end of Dockerfile lines, only on lines by themselves. Building the Dockerfile as-is results in the following error:

Error parsing reference: "node #A" is not a valid repository/tag

This is on page 11, in my version.
aidanhs (25) [Avatar] Offline
Hi, any `#A`, `#B` etc you saw will probably have been labels so the typesetter knew where to put the arrows when annotating code blocks in the final book - they should be gone now.

If this is still present in the final physical book or ebook, please let us know!