Create minio docker image with content

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I would like to build a minio docker container for integration test purposes.

I would like to do the following in my Dockerfile.

  • Create the minio container
  • Create a test bucket
  • Copy a small amount of test data into a test bucket
  • Start the minio service

Test Data

./test-data/foo.txt
./test-data/bar.txt

FROM minio/minio

RUN mkdir -p /buckets/my-bucket 

COPY test-data /buckets/my-bucket/test-data"

EXPOSE 9000 9001

CMD [ "minio", "server", "/buckets", "--address", ":9000", "--console-address", ":9001" ]

I know that I could run mc in a separate container to populate my bucket, but that requires a little bit of orchestration.

Is there a way that I could accomplish these steps in a Dockerfile?

minio docker
1 Answers

A Dockerfile is just a collection of shell commands...so you can do pretty much anything you want. For example:

FROM docker.io/minio/minio:latest

COPY --from=docker.io/minio/mc:latest /usr/bin/mc /usr/bin/mc
RUN mkdir /buckets
RUN minio server /buckets & \
    server_pid=$!; \
    until mc alias set local http://localhost:9000 minioadmin minioadmin; do \
        sleep 1; \
    done; \
    mc mb local/bucket1; \
    echo this is file1 | mc pipe local/bucket1/file1; \
    echo this is file2 | mc pipe local/bucket1/file2; \
    kill $server_pid

CMD ["minio", "server", "/buckets", "--address", ":9000", "--console-address", ":9001"]

If we use the above Dockerfile to build an image named minio-demo, and then start a container like this:

$ docker run --rm -p 127.0.0.1:9000:9000 -p 127.0.0.1:9001:9001  minio-demo

We see:

$ mc alias set demo http://localhost:9000 minioadmin minioadmin
$ mc ls demo
[2022-07-07 22:01:35 EDT]     0B bucket1/
$ mc ls demo/bucket1
[2022-07-07 22:01:35 EDT]    14B STANDARD file1
[2022-07-07 22:01:35 EDT]    14B STANDARD file2
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