Step 1 - create a host.
Create a host VM to run docker on. As it happens, I have an old Windows8 PC that I run as a HyperV server, but any server would do. I assigned my VM a single core and 1.5Gb of RAM which has been more than adequate for this project.
- Install Ubuntu18.04 server - select "Docker" option during install
- Set a static IP (or use DNS if you have some locally)
Step 2 - create a container.
I created a Flask app that simply returns "HELLO FLASKY" when queried by a web browser. I adapted the instructions from here
SSH into your VM (I used putty on a Windows PC, but use whatever floats your boat)
Run the following bash commands from console:
Enter python code into nano:
Create a Dockerfile using nano:
NEXT STEPS :
Further container thoughts
MONGO
Create a folder ~/data
Created a Mongo container
I created a Flask app that simply returns "HELLO FLASKY" when queried by a web browser. I adapted the instructions from here
SSH into your VM (I used putty on a Windows PC, but use whatever floats your boat)
Run the following bash commands from console:
mkdir ~/helloflasky
cd ~/helloflasky
sudo nano helloFlasky.py
Enter python code into nano:
from flask import Flask
app = Flask(__name__)
@app.route("/")
def greeting():
return "<h1 style='color:green'>Hello Flasky!</h1>"
if __name__ == "__main__":
app.run(host='0.0.0.0')
...save and exit nano
If python tools are installed locally (python3, python3-dev, python3-pip, flask), test the app on http://localhost:5000
Create a Dockerfile using nano:
sudo nano Dockerfile
Enter dockerfile into nano:
FROM python
LABEL maintainer="Nik"
RUN apt-get update
RUN apt-get install -y python3 python3-dev python3-pip nginx
RUN pip3 install uwsgi
RUN pip3 install flask
COPY ./ ./app
WORKDIR ./app
CMD python3 helloFlasky.py
...save and exit nano
Build container image
sudo docker build -t hello-flasky .
Create a container bound to TCP:5000
sudo docker run -p 5000:5000 -d hello-flasky
Check it using a web browser on http://host_ip:5000
NEXT STEPS :
- Run the app using uwsgi or gunicorn.
- Wrapper with NGINX.
- Create a data container (probably Mongo)
- Have helloFlasky get data from second container
- CI/CD
Further container thoughts
MONGO
Create a folder ~/data
Created a Mongo container
docker run -d -p 27017:27017 -v /home/nik/data:/data/db mongo
Tested with Robo 3T client (Windows)
