/AC3.2-PythonWebServer-1

A Web Server in Python

  • Hosting: AWS EC2
  • Webserver: Apache
  • Language: Python
  • Framework: Flask

EC2 - Elastic Cloud Computing

Creating

  1. Create an EC2 instance
  2. New security group
  3. New keypair

Connecting

Locally (on your laptop)

After you download the key (pem file) from AWS, save it to the .ssh directory in your home directory.

  mv got.pem ~/.ssh

Change the permissions on that file in order for ssh to work.

  chmod 400 got.pem

Access the remote computer. ssh = Secure shell.

ssh -i ~/.ssh/got.pem ec2-user@ec2-54-164-88-224.compute-1.amazonaws.com

This video is pretty good: https://www.youtube.com/watch?v=M2Wc8JIS-p8 However: I’d recommend keeping all your keys in ~/.ssh/

Installations

Environment

$ sudo yum update

Apache (Web Server)

$ sudo yum install -y httpd24

Python/Apache interoperability

$ sudo yum install mod24_wsgi-python27.x86_64

Flask framework

$ sudo pip install flask

Operation

Run the web server

$ sudo service httpd restart

Flask

Reference

Flask in AWS (one way):

chmod 711 . on home directory
mkdir ~/flaskapp
sudo ln -sT ~/flaskapp /var/www/html/flaskapp

$ cd ~/flaskapp
$ echo "Hello World" > index.html

# we can sanity test at this point
sudo vi /etc/httpd/conf/httpd.conf 
WSGIDaemonProcess flaskapp threads=5
WSGIScriptAlias / /var/www/html/flaskapp/flaskapp.wsgi

<Directory flaskapp>
    WSGIProcessGroup flaskapp
    WSGIApplicationGroup %{GLOBAL}
    Order deny,allow
    Allow from all
</Directory>

$ sudo service httpd restart

Database / Python

Installation

$ sudo yum install python27-pip
$ sudo yum install python27-devel
$ sudo yum install mysql27-devel
$ sudo yum install MySQL-python27

Monitoring

# hits
$ sudo tail -f /var/log/httpd/access_log

# errors
$ sudo tail -f /var/log/httpd/error_log

Other References

  1. Helpful but in PHP http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Tutorials.WebServerDB.CreateWebServer.html