Installing Docker

Prerequisites

1) Uninstall old versions:

sudo yum remove -y docker \

docker-client \

docker-client-latest \

docker-common \

docker-latest \

docker-latest-logrotate \

docker-logrotate \

docker-engine

2) Install Docker CE

Add the Utilities needed for Docker:

sudo yum install -y yum-utils \

device-mapper-persistent-data \

lvm2

3) Set up the stable repository:

sudo yum-config-manager \

--add-repo \

https://download.docker.com/linux/centos/docker-ce.repo

4) Install Docker CE:

sudo yum -y install docker-ce

5) Enable and start Docker:

sudo systemctl start docker && sudo systemctl enable docker

Add netsetostech2 to the docker group:

sudo usermod -aG docker netsetostech2

Installing a Flask Application on Debian based system

mkdir netsetostech

cd netsetostech

mkdir web

cd web

create a file app.py

from flask import Flask

app = Flask(__name__)

@app.route('/')

def hello_netsetos():

return "Netsetos, Hello there!"

if __name__ == '__main__':

app.run(debug=True, host='0.0.0.0')

Create a file requirements.txt

Flask==0.12

Create a Dockerfile

# Dockerfile - this is a comment. Delete me if you want.

FROM python:3.7

COPY . /app

WORKDIR /app

RUN pip install -r requirements.txt

ENTRYPOINT ["python"]

CMD ["app.py"]

Docker build command

docker build -t netsetos:latest .

docker run -d -p 5000:5000 netsetos