FROM centos:7 MAINTAINER Some Team <firstname.lastname@example.org> RUN yum update && yum install -y emacs
Note: each command creates a layer, so try to squeeze stuff into a single command.
Then build it like this:
docker build -t test/myemacs .
And run it like this:
docker run test/emacs emacs .bashrc
If you add this line to the Dockerfile:
then you can directly run the container and pass the args without mentioning the command, i.e.
docker run test/emacs .bashrc
COPY in a Dockerfile instructs docker to copy a file from the host to the container. e.g.
COPY entrypoint.sh /
VOLUME is used to just use the host’s filesystem for persistent data. e.g.
To do it at run time, do this:
docker run -it -v `pwd`:/root arunsrin/testpy
Instead of VOLUME, if you use ADD or COPY, it’ll be baked into the image and available to anyone who downloads it. e.g. requirements.txt. Use ADD or COPY for making it part of the image, and VOLUME for sharing data between host and container. Unlike COPY, ADD also accepts URLs as a source, and unpacks it if its an archive. e.g.
ADD . /python-oauth
When running a command like
docker build -t asda/asd . , the ‘.’ is
the build context. It’s contents are tar’d and sent to the docker
daemon so that ADD and COPY commands work seamlessly. Don’t run this
on a large folder like