Building a Docker Image from Dockerfile

Lets create some application files, assuming we will be working with a Python application
1. Create python app file vim app.py
```
from flask import Flask

app = Flask(__name__)

@app.route('/')
def counter():
    return '0'
```
  save the file ESC + wq!
2. Create python app dependency definition file vim requirements.txt
```
Flask==0.12
```
  save the file ESC + wq!

Now lets create a Dockerfile for the python application vim Dockerfile

FROM python:2.7-alpine

RUN mkdir /app
WORKDIR /app

COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt

COPY . .

LABEL maintainer="WebMagic Informatica <info@13.233.215.83>" \
version="1.0"

CMD flask run --host=0.0.0.0 --port=5000

save the file ESC + wq!

Build flask application docker image using
docker image build -t web1 .
Inspect image
docker image inspect web1
Tag image
docker image build -t web1:1.0 .
Get list of docker images
docker image ls
Remove the created image using
docker image rm web1:1.0