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Creating an image

1. Create a single Dockerfile in ~/dockerfile/Dockerfile

FROM centos
VOLUME /Users/sundar.rajagopalan/Downloads
VOLUME /Users/sundar.rajagopalan/docker-dir
RUN ["useradd", "builder"]
RUN ["yum", "install", "rpm-build", "-y"]
RUN ["yum", "install", "redhat-rpm-config", "-y"]
RUN ["yum", "install", "wget", "-y"]
RUN ["install", "-d", "-o", "builder", "-m", "755", "/home/builder/rpmbuild"]
WORKDIR "/home/builder/rpmbuild"
RUN ["install", "-d", "-o", "builder", "-m", "755", "BUILD", "RPMS", "SOURCES", "SPECS", "SRPMS"]
ENTRYPOINT ["/bin/bash"]

1. docker build -t rpmtest .

   This creates an image called “rpmtest”

2. Verify that the image exists by doing a:

   docker images

3. Launch an instance with:

   docker run -i -t -v /Users/sundar.rajagopalan/Downloads:/downloads /Users/sundar.rajagopalan/build:/build --name firstone rpmtest

4. Start a stopped instance with:

   docker start -a -i <container_id>

Commands for regular user

1. Connecting to an existing container docker attach <container_id or container_name>

2. Removing an image docker rmi <image_name>

Remove old docker containers:

docker rm $(docker ps -q -f status=exited)