How to copy multiple files in one layer using a Dockerfile

Question

The following Dockerfile contains four COPY layers   COPY README md    COPY package json    COPY gulpfile js    COPY   BUILD NUMBER      How to copy these files using one layer instead  The following was tried   COPY          BUILD NUMBER           README md           gulpfile           another file

User · Answer

It might be worth mentioning that you can also create a .dockerignore file, to exclude the files that you don't want to copy:

https://docs.docker.com/engine/reference/builder/#dockerignore-file

Before the docker CLI sends the context to the docker daemon, it looks for a file named .dockerignore in the root directory of the context. If this file exists, the CLI modifies the context to exclude files and directories that match patterns in it. This helps to avoid unnecessarily sending large or sensitive files and directories to the daemon and potentially adding them to images using ADD or COPY.

User · Answer

COPY README md package json gulpfile js   BUILD NUMBER      or  COPY     BUILD NUMBER    README md    gulpfile    another file           You can also use wildcard characters in the sourcefile specification  See the docs for a little more detail   Directories are special  If you write  COPY dir1 dir2      that actually works like  COPY dir1   dir2        If you want to copy multiple directories  not their contents  under a destination directory in a single command  you ll need to set up the build context so that your source directories are under a common parent and then COPY that parent

User · Answer

simple   COPY README md  package json gulpfile js   BUILD NUMBER      from the doc      If multiple  resources are specified  either directly or due to   the use of a wildcard  then  must be a directory  and it must   end with a slash

User · Answer

COPY  lt all gt   lt the gt   lt things gt   lt last-arg-is-destination gt    But here is an important excerpt from the docs       If you have multiple Dockerfile steps that use different files from   your context  COPY them individually  rather than all at once  This   ensures that each step   s build cache is only invalidated  forcing the   step to be re-run  if the specifically required files change    https   docs docker com develop develop-images dockerfile best-practices  add-or-copy

[dockerfile] How to copy multiple files in one layer using a Dockerfile?

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