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Configure a Back End for a Web Application

In this lab, we set up a back end for the existing front end of a web application. We do this by creating a proper folder that will hold the code of our back end. Then we proceed to create a systemd file which will be used to start, stop, and get the status of this process at any given time. In addition to this, we will daemonize the process in this manner. In general, we might ask ourselves what does this have to do with Apache web server? If we have a front-end web application served to us via the Apache web server, there likely exists a back end that will fetch the content to be presented by the front end. In addition to this, Apache web server doesn't necessarily need to be configured to serve websites. It can also serve as a reverse proxy for various API's and serve pretty much any content imaginable. Therefore, it stands to reason we should know how to configure Apache web server to interact not only with the user, website, or front end, but the back end as well.

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Path Info

Clock icon Intermediate
Clock icon 1h 0m
Clock icon Oct 18, 2019

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Table of Contents

  1. Challenge

    Create a New Directory for the Back End and Move `` to the Newly-Created Directory

    mkdir /home/cloud_user/Backend
    sudo mv /home/cloud_user/HardeningApache-master/ /home/cloud_user/Backend/
    sudo chown cloud_user:cloud_user /home/cloud_user/Backend/
  2. Challenge

    Install Dependencies: python36.x86_64, python36-devel.x86_64, "Development Tools", python36-pip, Flask, flask-cors, psutil, and tcpdump, then Open Port 65535 with `firewalld`

    sudo yum install epel-release
    sudo yum update
    sudo yum install python36
    sudo yum install python36-devel
    sudo yum groupinstall "Development Tools"
    sudo yum install python36-pip
    ln -s /usr/local/bin/pip3 /usr/bin/pip3
    sudo pip3 install Flask
    sudo pip3 install flask-cors
    sudo pip3 install psutil
    sudo yum install tcpdump
    sudo firewall-cmd --permanent --add-port=65535/tcp
    sudo firewall-cmd --reload
  3. Challenge

    Create a systemd File for Our Back End Called "flaskapp.service" in `/etc/systemd/system/`

    sudo vim /etc/systemd/system/flaskapp.service
    ExecStart=/usr/local/bin/flask run -h -p 65535

    Save and Close

    sudo systemctl daemon-reload
    sudo systemctl start flaskapp
    sudo systemctl enable flaskapp
  4. Challenge

    Configure the Front End to Be Able to Access the Back End and Test If the Back End Works

    vim /var/www/html/index.html

    Insert the Server Public IP address here

    var base_url = 'http://<Server_Public_IP>:65535';

    Save and close


    Test if it works

    curl http://<Server_Public_IP>:65535/log_messages

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