What is the difference between scaling up vs scaling out?

 In the context of AWS, here are the differences between scaling up vs scaling out:-

Scaling up(vertical scaling)

It includes increasing the capacity of the resources that existed such as uploading to a more powerful server with an even higher CPU.

This particular approach is very much suitable for the scenario where the bottleneck is primarily resource-bound on a single server, such as CPU or memory utilization reaching its limits

Here is the example coding given for vertical scaling::

// Example code for upgrading instance size in AWS
Const AWS = require(‘aws-sdk’);
Const ec2 = new AWS.EC2();
Const params = {
  InstanceId: ‘YOUR_INSTANCE_ID’,
  InstanceType: ‘NEW_INSTANCE_TYPE’ // e.g., ‘t3.large’
};
Ec2.modifyInstanceAttribute(params, (err, data) => {
  If (err) console.log(err, err.stack);
  Else console.log(‘Instance upgraded successfully:’, data);
});
Scaling out (Horizontal scaling)

Horizontal scaling involves adding more Instances and even servers for the task of distribution of the local across multiple machines

This particular approach is very much suitable in the scenario where the bottleneck is related to a specific component or service that can be scaled horizontally, such as web server or database.

Here is the example coding is given of scaling out:-

// Example code for creating an auto-scaling group in AWS
Const autoScaling = new AWS.AutoScaling();
Const params = {
  AutoScalingGroupName: ‘YOUR_AUTO_SCALING_GROUP_NAME’,
  LaunchConfigurationName: ‘YOUR_LAUNCH_CONFIGURATION_NAME’,
  MinSize: 2, // Minimum number of instances
  MaxSize: 10, // Maximum number of instances
  DesiredCapacity: 4 // Desired number of instances
};
autoScaling.createAutoScalingGroup(params, (err, data) => {
  if (err) console.log(err, err.stack);
  else console.log(‘Auto-scaling group created successfully:’, data);
});