Docker-Python

Python CGI with Docker

A simple python script which can be served as CGI script using Apache2 in Ubuntu Docker Container. Demo app is deployed at GCP.

Create a Dockerbuild file

    FROM ubuntu:17.10
    RUN apt-get update -y; \
        apt-get install -y apache2; \
        a2enmod cgi; \
        apt-get install python2.7 -y; \
        apt-get install python-pip -y; \
        apt-get install python2.7-dev -y; \
        pip install requests;
    ENTRYPOINT service apache2 start && /bin/bash
    EXPOSE 80

Build the Image

    docker build -t ubuntu17 .
    

    [root@instance-2 testing]# docker images
    REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
    ubuntu17            latest              b6c34fda4057        4 minutes ago       477MB

Prepare the CGI script

Script name : myapp , permission : chmod +x myapp

 
    #!/usr/bin/env python2.7
    import os
    import requests
    import json

    class Python_CGI(object):
            """docstring for Python_CGI"""
            def __init__(self, url):
                    self.url = url

            def __call__(self):
                    res = requests.get(self.url+"?api_key=DEMO_KEY")
                    print "Content-Type: text/html"
                    print
                    print """
                    <TITLE>CGI script ! Python Weather API call</TITLE>
                    <H1>Neo - Lookup</H1>
                    <H2>MyAPP at Compute Instance in GCE</H2>
                    """+"\n Request URL : "+self.url+" \n ,status code: "+str(res.status_code)+"\n<pre>"+json.dumps(res.json(), indent=3, sort_keys=True)+"</pre>"
                    return
    Python_CGI(os.environ.get("QUERY_STRING").split("=")[1])()

Create and Run a Docker Container to serve CGI Script

Placing the python script under apache2 default CGI folder . Exposing container port 80 to 80 in compute instance and added a firewall ingress rule in GCP. I am also mounting local directory cgi-bin which contins python script to /usr/lib/cgi-bin in docker container.

    docker run -d -p 80:80 -v "$(pwd)"/cgi-bin/:/usr/lib/cgi-bin ubuntu17
    


    [root@instance-2 testing]# docker ps
    CONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                  NAMES
    c606244ddfe4        ubuntu17            "/bin/sh -c 'servi..."   About a minute ago   Up About a minute   0.0.0.0:80->80/tcp   pensive_brahmagupta

Test the CGI script

  http://XX.XXX.XXX.XX/cgi-bin/myapp?url=https://api.nasa.gov/EPIC/api/natural/date/2015-10-31