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How do you run a web server on EC2?
\nI've used AWS Lambda and/or Cloudformation extensively but was curious to see how difficult it is to spin up a EC2 instance and expose the right ports from the command line. Using AWS' command line interface This is a good approach for testing and playing with tools and has advantages over Cloudformation. Debugging Cloudformation can be a huge pain. Also creating and updating stacks can take a bit longer than simply running an instance from terminal.
\n aws --version.
What parameters do we need to run an instance? We need:
\nBefore running any commands, export the AWS region you want to use so that you're not prompted for every command. I'll be using us-east-1.
\nexport AWS_DEFAULT_REGION=us-east-1
\nThis identifies the instance on Amazon's marketplace. We'll stick with defaults and use the latest Amazon Linux Image.
\nRun:
\naws ssm get-parameters --names /aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2 --query 'Parameters[0].[Value]' --output text
\nAs of this writing, the latest Amazon Linux AMI is ami-0922553b7b0369273.
\nWhen you create an EC2 instance on aws.amazon.com using the UI you're prompted to use an existing private key or create a new one. The private key is just the label associated with a set of public and private keys allowing SSH access to your instance.
\nThis command lists all of your existing key pairs:
\naws ec2 describe-key-pairs | jq -r '.KeyPairs'
\nIf you don't have any keys, you can create a new one:
\naws ec2 create-key-pair --key-name webserver | jq -r '.KeyMaterial' > ~/.ssh/webserver.pem
\nThis command saves the RSA key material to ~/.ssh/webserver.pem.
\nAWS accounts have a default VPC, subnet, and set of security groups.
\nRather than create a new subnet we'll just use one of the subnets associated with the default VPC.
\nHere's how you list subnets:
\naws ec2 describe-subnets | jq -r '.Subnets'
\nFor a web server, we'll use two security groups: a default security group associated with the default VPC, and a custom security group that exposes ports 22 (SSH), 80 (HTTP), and 443 (HTTPS).
\nGet the default security group ID as follows:
\naws ec2 describe-security-groups --group-name default | jq -r '.SecurityGroups[0].GroupId'
\nAnd create a new security group:
\naws ec2 create-security-group --group-name webserver --description webserver | jq -r '.GroupId'
\nNow we need to run authorize-security-group-ingress three times (once for each port).
\naws ec2 authorize-security-group-ingress --group-name webserver --protocol tcp --port 22 --cidr '0.0.0.0/0'\naws ec2 authorize-security-group-ingress --group-name webserver --protocol tcp --port 80 --cidr '0.0.0.0/0'\naws ec2 authorize-security-group-ingress --group-name webserver --protocol tcp --port 443 --cidr '0.0.0.0/0'
\nWe need to expose port 22 for SSH access, port 80 - the port that our node server will listen to, and port 443 for HTTPS.
\nUser data lets us run scripts when the instance is launched. In this case, we need to install node and npm on the EC2 instance when it's created. Create a new file (e.g., user-data.sh) and add:
\n#!/bin/bash -v\nsu ec2-user -c \"curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash\"\nsu ec2-user -c \"source /home/ec2-user/.nvm/nvm.sh && nvm install node\"\nsu ec2-user -c \"source /home/ec2-user/.nvm/nvm.sh && nvm use node\"\nln -s /home/ec2-user/.nvm/versions/node/v10.11.0/bin/node /usr/bin/node\nln -s /home/ec2-user/.nvm/versions/node/v10.11.0/bin/npm /usr/bin/npm\nmkdir -p /var/www\necho -e \"require('http').createServer((req, res) => {\" > /var/www/server.js\necho -e \" res.setHeader('content-type', 'text/plain')\" > /var/www/server.js\necho -e \" res.end('OK')\" > /var/www/server.js\necho -e \"}).listen(process.env.PORT || 80)\" > /var/www/server.js\nnode /var/www/server.js
\nWe'll supply the path to the user-data.sh script as a parameter when we create the EC2 instance like so:
\naws ec2 run-instances --user-data file://path/to/your/user-data.sh
\nHere's what everything looks like together:
\n","avatar":"https://s3.amazonaws.com/contentkit/static/cjn3l18390lyt0158i8qxs5dc/aws.png"}}}}