Programming Sockets in Python

| programming | python |

EDIT: I am sorry for derping out of control. When I initially published this post it was called “Programming Web Sockets in Python”, this is just flat out wrong. What we are making here is just a regular socket. Web Sockets and regular sockets are similar but are certainly not the same thing. I hope you will still find this useful! Sockets are pretty much the basis of how applications work on the Internet. Python makes it super easy to get started programming sockets. In this brief introduction we will create a simple server that greets the user when it receives incoming requests from the client application. Due to my recent obsession with Linux Containers we will also be implementing this inside of two containers. Containers make it really simple to simulate a network because you can create additional hosts in seconds.

Creating your Containers

I am running Ubuntu 14.04. So creating two additional containers can be achieved by running the following as the root user.
lxc-create -t download -n pyServer 


  Choose ubuntu, trusty, amd64 when prompted
  
    
  




  Then clone the first container
  
    
  



lxc-clone -o pyServer -n pyClient

Running the Server

Now that we have created our containers lets jump into our server container and fire up our simple server application. We can start up the container by issuing the following command as root: lxc-start -n pyServer -d, this will start the container as a daemon. Let’s go ahead and get into by attaching the container. I like to do this inside of screen so that we can easily get in and out of the container. Create a screen session screen -dRR pyServer and once inside the screen attach the container lxc-attach -n pyServer Once we are inside the container we need to install python and launch our simple server.
apt-get install python vim pyServer.py
Inside of vim (or your favorite text editor) we need to enter the following simple python code.
from socket import *  

serverPort = 12000

serverSocket = socket(AF_INET, SOCK_DGRAM)

serverSocket.bind((’’, serverPort))

print “The server is ready to rock and roll!"


while 1:  

    name, clientAddress = serverSocket.recvfrom(2048)  

    response = “Hello “ + str(name) + ”! You are really good at socket programming”  

    serverSocket.sendto(response, clientAddress)

The code should be pretty straightforward. We are creating a new serverSocket that is bound to port 12000. When it receives requests (which include a name) it responds with an encouraging message. Fire up this server by running python pyServer.py if all goes well you should see a message that states This server is ready to rock and roll! Exit the container (and the screen session) by pressing Ctrl+a and Ctrl+d

Running the Client

Now that we have our server up and running, lets get our client working as well. Before we move forward, lets grab the IP address of our server container because we will need it soon. You can get the IP by runninglxc-ls --fancy. Launch the client container, attach it in screen, and install python in the same way that we did previously.
lxc-start -n pyClient -d screen -dRR pyClient 
lxc-attach -n pyClient 
apt-get install python 
vim pyClient.py
In vim, lets create the pyClient.py program by entering the following code.
from socket import *  

# Replace the IP address in serverName with the IP of your container that you grabbed previously.


serverName = ‘10.0.3.211’
serverPort = 12000
clientSocket = socket(AF_INET, SOCK_DGRAM)

name = raw_input(‘Please enter your name:’)

clientSocket.sendto(name, (serverName, serverPort))


response, serverAddress = clientSocket.recvfrom(2048)
print response
clientSocket.close()

This code is also pretty straightforward. It asks the user for their name, sends it to the server, and prints the response. You can try this out now! Save the file and execute your python program by runningpython pyClient.py. After entering your name and pressing enter you should see a response from your server with the encouraging message. This was a pretty trivial exercise, but we can quickly see that we can expand upon this basic code to create much more interesting and complex applications. We can also leverage the power and simplicity of LXC to create a simulated large network for distributed applications.

Thank you for reading! Share your thoughts with me on bluesky, mastodon, or via email.

Check out some more stuff to read down below.

Most popular posts this month

Recent Favorite Blog Posts

This is a collection of the last 8 posts that I bookmarked.

Articles from blogs I follow around the net

“An absolute bare minimum of interactivity”

I mentioned Atari’s Pong recently, a game often considered to be the first videogame ever. It wasn’t, and as a matter of fact, it was a clone of one of the games from the first home console Magnavox Odyssey, released earlier in 1972: This is a 34-minute vi...

via Unsung August 28, 2026

You Know GDPR Is Good Based on Who Hates It

FDR has always been one of my favorite presidents, second maybe to Lincoln. Both were men the establishment assumed were one of them until, to their horror, they governed like they weren't. Both could trash the opposition in one breath and take the moral h...

via matduggan.com August 28, 2026

The growing divide between AI hype and software engineering reality

It is widely accepted that there is an AI bubble in the financial markets at the moment. The moderate opinion is however that LLMs are constantly improving and will eventually take over more and more tasks from humans and increase productivity. But are LLM...

via Optimized by Otto August 28, 2026

Generated by openring