Install the CloudWatch agent in your VMs to get critical information like available memory. Host your app servers in the same availability zone as your database, for lower latency and lower cost (inter-AZ traffic within the same region is also charged). And to increase availability, because hosting the app servers and database in two zones means that either zone failure takes down your service.
EC2 DevOps Tips
EC2 DevOps Tips
EC2 DevOps Tips
Install the CloudWatch agent in your VMs to get critical information like available memory. Host your app servers in the same availability zone as your database, for lower latency and lower cost (inter-AZ traffic within the same region is also charged). And to increase availability, because hosting the app servers and database in two zones means that either zone failure takes down your service.