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