Lecture 5 Notes

Part 1: Setup

Go ahead and launch an EC2 instance and SSH onto it by following the instructions here.

Make to open up SSH and HTTP to all addresses.

Part 2: Checking Hardware

SSH onto your new instance:

$ ssh -i your-ssh-key.pem [email protected]

Inspect the CPU/memory:

$ sudo lshw

Inspect the disk storage:

$ lsblk

Part 3: Running a Basic Web Server

Create a simple HTML file:

$ mdkir web && cd web

$ echo "Hello World! From <your name>" > index.html

OR

$ vim index.html

Now run a Python HTTP server on port 80:

$ sudo python3 -m http.server 80

Navigate to your IP address via your browser.

Attempt to navigate to my website via the IP address on the board.

Part 4: Experimenting with Security Groups

Edit your security group to limit HTTP access to just your IP address.

You can double check that it matches your IP address by googling "What's my IP address".

Can you access your neighbors site?

Attempt to navigate to my website via the IP address on the board. Does it still work?

Part 5: Long Running Tasks

You can use the & to run commands in the background:

$ ping 8.8.8.8 &

OR

$ sudo python3 -m http.server 80 &

However, if you exit your shell then those commands stop.

We can keep commands alive (aka ignore the shutdown signals) by using nohup:

$ nohup sudo python3 -m http.server 80 &

If you exit, your server will continue to run!

Part 6: Second Web Server

Let's run a second server on the same EC2 instance.

Create a new folder api in the home directory:

$ mkdir ~/api && cd ~/api

Create a different HTML file in that folder and run a web server on port 8000.

$ python3 -m http.server 8000

What happens when you navigate to http://<your ip address>:8000? How do you fix this?

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