add Docker exercises

# I use CentOS latest

FROM centos:latest

# I set the work directory

WORKDIR /home/mpi4py

# I copy the content of the current dir into /home/mpi4py

COPY . /home/mpi4py

# Install some sw

RUN yum install -y  vim wget epel-release

RUN yum install -y gsl gsl-devel gcc gcc-gfortran make autoconf patch automake 

RUN yum install -y mpich-3.2 mpich-3.2-devel mpich-3.2-autoload environment-modules 

RUN yum install -y python-devel numpy python-matplotlib python2-pip

# I set some env virables

ENV MPI_INCLUDE=/usr/include/mpich-3.2-x86_64

ENV MPI_PYTHON_SITEARCH=/usr/lib64/python2.7/site-packages/mpich-3.2

ENV MPI_LIB=/usr/lib64/mpich-3.2/lib

ENV MPI_BIN=/usr/lib64/mpich-3.2/bin

ENV MPI_COMPILER=mpich-3.2-x86_64

ENV MPI_SYSCONFIG=/etc/mpich-3.2-x86_64

ENV MPI_SUFFIX=_mpich-3.2

ENV MPI_MAN=/usr/share/man/mpich-3.2

ENV MPI_HOME=/usr/lib64/mpich-3.2

ENV MPI_FORTRAN_MOD_DIR=/usr/lib64/gfortran/modules/mpich-3.2-x86_64

ENV PATH="/usr/lib64/mpich-3.2/bin:${PATH}"

# install some python modules

RUN pip install --upgrade pip

RUN pip install mpi4py

RUN pip install astropy

RUN pip install ipython

# Use an official Python runtime as a parent image

FROM python:2.7-slim

# Set the working directory to /app

WORKDIR /app

# Copy the current directory contents into the container at /app

COPY . /app

# Install any needed packages specified in requirements.txt

RUN pip install --trusted-host pypi.python.org -r requirements.txt

# Make port 80 available to the world outside this container

EXPOSE 80

# Define environment variable

ENV NAME World

# Run app.py when the container launches

CMD ["python", "main.py"]

from flask import Flask

import os

import socket

visits = 0

app = Flask(__name__)

@app.route("/")

def hello():

    try:

        with open( "count.txt", "r" ) as f:

             count = f.read()

    except:

 	     count = 0  

    html = "<h3>Hello {name}!</h3>" \

           "<b>Hostname:</b> {hostname}<br/>" \

           "<b>Visits:</b> {visits}"

    count = int(count)

    with open( "count.txt", "w" ) as f:

         f.write( str(count+1) )

    return html.format(name=os.getenv("NAME", "world"), hostname=socket.gethostname(), visits=count)

if __name__ == "__main__":

    app.run(host='0.0.0.0', port=80)