Create a vpc for ntier
- Basic ntier architecture with high availability and fault tolerance
- In AWS we have Regions and Zones
- subnets are scoped to Zones
- The AWS VPC with subnets
- In this vpc we have a default route table
- All the internal communications with in vpc is allowed
- With every vpc created we get a default
- security group
- network acl
- security group
- Lets create an ec2 instance in web1 subnet
- To connect to this ec2 instance from outside lets use
ssh -i <path to pem> ubuntu@<public-ip>
* This will not work as vpc doesnot have internet connectivity.
* Lets create internet gateway and attach this to vpc
* Now enable route between route table and internet gateway.
* Navigate to route table then routes
* Lets try to connect ssh from laptop again
* Lets look at network interface which is called as elastic network interface by aws
* Security Group is attached to network interface which allows only the packets with entries written in security group