02-aws.md

Amazon Web Services

Note: this file only contains notes about the labs. For the theory, check the here.

We can interact with AWS using:

• AWS Management Console - remember to select the region;
• AWS CLI - a unified tool to manage your AWS services;
  • Useful to create scripts to automate tasks;
• AWS SDKs - for programming languages like Python, Java, Ruby, etc.
  • We will use the Java SDK in the labs.

EC2

Launching an Instance

1. Choose name, OS, AMI and architecture;
2. Select the instance type (e.g., t2.micro);
3. Create a key pair (.pem file) - used to connect to the instance;
4. Configure the security group (firewall rules) - you can create a new one or use an existing one;
5. In Advanced Details, you can enable Detailed Monitoring (CloudWatch).

Now you can launch the instance and connect to it using SSH:

ssh -i "key.pem" ec2-user@<public-ip>

Load Balancing and Auto Scaling

Create VM Image

1. Using the instance you created, install the necessary software;
2. Create an AMI from the instance, selecting a name.

Create Load Balancer

1. Create a Classic Load Balancer;
2. Select a name and the availability zones;
3. Select the security group;
4. Configure the health check.

Create Launch Template (similar to the creation of an instance)

1. Create a Launch Template;
2. Select the name and the AMI you created;
3. Select the instance type and the key pair;
4. Configure the security group.

Create Auto Scaling Group

1. Create an Auto Scaling Group;
2. Give it a name and select the launch template you created;
3. Select the availability zones - ⚠️ must be the same as the load balancer;
4. In the Advanced options, Attach to an existing load balancer, and choose the one you created;
5. Configure the health checks (Turn on Elastic Balancing health checks, grace period of 60s, and enable CloudWatch at the additional settings);
6. Configure the desired capacity and the minimum and maximum size;
7. Configure the scaling policies (you can create CloudWatch alarms and attach them to the scaling policies).