.dockerignore mentioned files are not ignored

Question

I'm having in Dockerfile:

ENV DATARATOR_HOME /usr/local/share/datarator
RUN mkdir -p $DATARATOR_HOME
COPY . $DATARATOR_HOME

and .dockerignore file:

/Gemfile.lock
/coverage
/spec
*.bundle
*.so
*.o
*.a
mkmf.log
*.swp
/.*
/tmp
/log

However, once showing files in the built container, I can see also those that are supposed to be ignored:

/usr/local/share/datarator # ls -lha
total 128
drwxr-xr-x   10 root     root        4.0K Mar 29 21:01 .
drwxr-xr-x    4 root     root        4.0K Mar 29 21:00 ..
drwxr-xr-x    2 root     root        4.0K Mar 29 21:01 .bundle
-rw-rw-r--    1 root     root          24 Mar 29 20:37 .coveralls.yml
-rw-rw-r--    1 root     root          81 Mar 29 20:37 .dockerignore
drwxrwxr-x    8 root     root        4.0K Mar 29 20:37 .git
-rw-rw-r--    1 root     root          85 Mar 29 20:37 .gitignore
-rw-rw-r--    1 root     root        1.2K Mar 29 20:37 .travis.yml
-rw-rw-r--    1 root     root         509 Mar 29 20:37 .vimrc
-rw-rw-r--    1 root     root         959 Mar 29 20:37 Dockerfile
-rw-rw-r--    1 root     root          94 Mar 29 20:37 Gemfile
-rw-r--r--    1 root     root        2.7K Mar 29 21:01 Gemfile.lock
-rw-rw-r--    1 root     root         343 Mar 29 20:37 Guardfile
-rw-rw-r--    1 root     root        1.0K Mar 29 20:37 LICENSE.txt
-rw-rw-r--    1 root     root          71 Mar 29 20:37 Procfile
-rw-rw-r--    1 root     root       14.8K Mar 29 20:37 README.md
-rw-rw-r--    1 root     root         198 Mar 29 20:37 Rakefile
drwxrwxr-x    2 root     root        4.0K Mar 29 20:37 bin
drwxrwxr-x    2 root     root        4.0K Mar 29 20:37 config
-rw-rw-r--    1 root     root          97 Mar 29 20:37 config.ru
-rw-r--r--    1 root     root       16.0K Mar 29 21:01 datarator-0.0.1.gem
-rw-rw-r--    1 root     root        1.7K Mar 29 20:37 datarator.gemspec
drwxrwxr-x    4 root     root        4.0K Mar 29 20:37 lib
drwxrwxr-x    2 root     root        4.0K Mar 29 20:37 log
drwxrwxr-x    3 root     root        4.0K Mar 29 20:37 spec
drwxrwxr-x    2 root     root        4.0K Mar 29 20:37 tmp

How can I achieve having all those mentioned in the .dockerignore file ignored?

Answer 1

The .dockerignore rules follow the filepath/#Match.

Try (for testing) Gemfile.lock instead of /Gemfile.lock.

And check that the eol (end of line) characters are unix-style, not Windows style in your .dockerignore file.

Apparently, (docker 1.10, March 2016) using rule starting with / like /xxx ( or /.*) is not well supported.