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I tried to put centos in docker and put Docker in it by relying on this site, but I stumbled at the command prompt
https://qiita.com/chisaki0606/items/a4b42af5c4735c94057a
vi DockerfileWhen I execute, a pink wavy line appears and the work is not finished even if it is enough
What should I do now
The environment is
MAc catalina
docker 19.03.13
is

  • Answer # 1

    Then open and edit with the vi command to write in the Dockerfile.

    $vi Dockerfile


    This will launch an editor for editing empty files.
    No matter how long you wait here, nothing happens.
    (It's just the editor launching and waiting for you to edit.)

    Using the launched editor, as described on the referenced site
    Do "Write the following contents in the Dockerfile" and save the file.

    Describe the following contents in the Dockerfile.

    FROM ruby: 2.5
    RUN apt-get update -qq&&apt-get install -y nodejs postgresql-client
    ... abbreviation ...

    If you don't know how to use vi, please check it yourself.