Points to be considered to migrate an application from On Premises to AWS

Below are some of the tips how to Design an application migration and which component has to placed in which level below are some of the tips for the same

1) If it is publicly accessed web application then we need to design in such a way that initial request is hitting Route 53 then to ELB

Request will hit Route53 from there request will be forwarded to ELB

2) Number of Subnet's to be created

a) Management subnet, ( Antivirus, to check valid Request), 

In Management subnet we will have all management related activities like antivirus, firewall... Even we can place ELB will be in management subnet.

b) Web Subnet

Where web application resides. This subnet can either be public or priavte based on application. Inbound rule for this subnet will be like  all traffic from management

c) Application Subnet 

Where the actual application resides. Inbound for this subnet will be like all traffic from web subnet  and outbound will be like all traffic to web and data db subnet

d) DB subnet 

Ports for application for DB will be different, so it is better to create a seperate subnet for DB. Because opening the ports for application in Security group will open the port to DB instances as well. So it is better to create different subnet. Inbound - only from application

Available tools to migrate.

racemi - migration 80 mb chunks, during migration it will create a timestamp replica for disk

migration