AWS EC2

Sign Up for AWS

https://aws.amazon.com/

Create Your Instance

1. From your AWS Console, type EC2 in the search bar. This will send you to the EC2 dashboard.

1. From the EC2 Dashboard, click "Launch Instance"

1. Choose the default image. You can click through the "Qick Start" options. It should indicate "free tier eligible".

2. Click to Configure Security Group. Add http - it will configure to port 80 automatically.

3. Click to "Launch"

4. After that a modal window will prompt you to either create or choose an existing .pem file.

   • Create a new one:
     1. Choose "Create a new key pair"
     2. Ideally give it a lower case name with no spaces.
     3. Click "Download key pair". AWS won't let you click "Launch Instances" until you download your key pair
     4. Using terminal, you'll need to cd to the directory that the .pem file is in and type the following: chmod 400 YOUR-PEM-FILE.pem

5. Click the link to take you to your instance page.

6. Eventually you'll see a green dot next to your instance, letting you know it's ready. Take note of of the "Public DNS" line. You'll use that url to [[SSH|SSH]] into your instance.

ssh

Go to your EC2 Dashboard.

Click on '# Running Instances'

Click the checkbox of the instance you want to SSH in to (Screenshot)

Copy the Public DNS to your clipboard.

In terminal, navigate to the directory your .pem file is in

ssh -i the-directory-your-pem-file-is-located/YOUR-PEM-FILE.pem ec2-user@PASTE-YOUR-PUBLIC-DNS-HERE

You've successfully SSH'ed if you see the following:

       __|  __|_  )
       _|  (     /   Amazon Linux AMI
      ___|\___|___|

https://aws.amazon.com/amazon-linux-ami/2017.03-release-notes/
1 package(s) needed for security, out of 1 available
Run "sudo yum update" to apply all updates.
[ec2-user@ip-172-31-12-226 ~]$

If you see Run "sudo yum update" to apply all updates. then run:

sudo yum update

Unprotected key file

If you see the following warning when trying to SSH:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0644 for 'YOUR-PEM-FILE.pem' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
Load key "dsi.pem": bad permissions
Permission denied (publickey).

Type the following:

chmod 400 YOUR-PEM-FILE.pem

After that, try the ssh command again.

Once you can log into the instance, prepare it for the express app:

sudo yum update
sudo yum install git
sudo su - root

Install nvm - instructions from here: https://github.com/creationix/nvm

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash

source ~/.bashrc

nvm install node

Setting up your own App

Fork this express basic app on github: https://github.com/wdi-sg/express-basic

Clone it to your computer.

So that you know that it's yours, make a single change in the app. response.send something different. Commit those changes and push them to your github repo.

Then inside the AWS instance, clone it, install the dependencies and start the app.

git clone [https://github.com/<YOUR USER>/express-basic.git]
cd express-basic
npm install
node index.js 80

Copy the "Public DNS" from the AWS console. Paste it into the browser to see your running app.

See the request handler console.log in the ssh terminal.

pairing exercise

Repeat the above steps