docker build specify dockerfile code example

Example 1: docker build

docker build -t [tag] .

Example 2: docker build from dockerfile

$ docker build - < Dockerfile

Example 3: dockerfile example

FROM ubuntu:18.04
COPY . /app
RUN make /app
CMD python /app/app.py

Example 4: how to create docker image from custom filename

cat DockerFile.debian.foo | docker build -t debian.foo -

Example 5: multiple run dockerfile

RUN cd /
    git clone https://github.com/
    cd /fileadmin/
    bundle install
    rake db:migrate
    bundle exec rails runner "eval(File.read 'createTestUser.rb')"
    mkdir /pending
    mkdir /live
    chmod 777 /pending
    chmod 777 /live

Example 6: dockerfile run app cmd

RUN apt-get install python3
CMD echo "Hello world"
ENTRYPOINT echo "Hello world"