Lab #7: Create a Docker image with EXPOSE instruction
Pre-requisite:
Tested Infrastructure
| Platform | Number of Instance | Reading Time |
|---|---|---|
| Play with Docker | 1 | 5 min |
Pre-requisite
- Create an account with DockerHub
- Open PWD Platform on your browser
- Click on Add New Instance on the left side of the screen to bring up Alpine OS instance on the right side
Assignment:
- Create an image with expose instruction
- Create hello.py
- Create dockerfile
- Build dockerfile
- Run application
Creating directory
mkdir pythonexposeapp
cd pythonexposeapp
Creating hello.py
vi hello.py
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "welcome to Dockerlabs!! successfully done !!"
if __name__ == "__main__":
app.run()
Creating Dockerfile
vi Dockerfile
FROM python:3.5
# Update and install dependencies
RUN apt-get update
RUN pip install Flask
# Add code
ADD . /opt/webapp/
# Set the working directory
WORKDIR /opt/webapp
# Set environment variables
ENV FLASK_APP=hello.py
# Expose the application's port
EXPOSE 5000
# Run the application
CMD ["flask", "run", "--host=0.0.0.0"]
Building Dockerfile
docker build -t pythonapp:v1 .
Running Docker image
sangam$ docker run -p 5000:5000 pythonapp:v1
* Serving Flask app "hello.py"
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: off
* Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
172.17.0.1 - - [17/Aug/2019 12:21:20] "GET / HTTP/1.1" 200 -
172.17.0.1 - - [17/Aug/2019 12:21:20] "GET /favicon.ico HTTP/1.1" 404 -
By now, the application should be accessible http://0.0.0.0:5000/
Contibutor
Next » VOLUME_instruction