dockerfile commands code example

Example 1: docker command

docker ps # current containers
docker run # create and start the container
docker create # create container
dokcer exec # to run commnads in container for once
docker volume # create a docker volume
docker network # create a docker network
docker rm # remove container 
docker images # list the images
docker rmi # remove image
docker build # build a new image from dockerfile
docker push # push your image to docker repo
docker pull # download an image from docker repo
docker commit # create an image from container

Example 2: docker ARG

$ docker build --build-arg some_variable_name=a_value

Example 3: dockerfile example

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

Example 4: how run dockerfile

# Use the official image as a parent image.
FROM node:current-slim

# Set the working directory.
WORKDIR /usr/src/app

# Copy the file from your host to your current location.
COPY package.json .

# Run the command inside your image filesystem.
RUN npm install

# Inform Docker that the container is listening on the specified port at runtime.
EXPOSE 8080

# Run the specified command within the container.
CMD [ "npm", "start" ]

# Copy the rest of your app's source code from your host to your image filesystem.
COPY . .

Example 5: dockerfile run app cmd

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