Deploying WebApp with AWS VPC using TERRAFORM
AWS Cloud provides Network As A Service(NAAS) through VPC(Virtual Private Cloud).
?A virtual private cloud (VPC) is a virtual network dedicated to your AWS account. It is logically isolated from other virtual networks in the AWS Cloud. You can launch your AWS resources, such as Amazon EC2 instances, into your VPC.
PROBLEM STATEMENT:
We have to create a web portal for our company with all the security as much as possible.So, we use Wordpress software with dedicated database server.Database should not be accessible from the outside world for security purposes.We only need to public the WordPress to clients.
Steps:
1) Write a Infrastructure as code using terraform, which automatically create a VPC.
2) In that VPC we have to create 2 subnets:
a) public subnet [ Accessible for Public World! ]
b) private subnet [ Restricted for Public World! ]
3) Create a public facing internet gateway for connect our VPC/Network to the internet world and attach this gateway to our VPC.
4) Create a routing table for Internet gateway so that instance can connect to outside world, update and associate it with public subnet.
5) Launch an ec2 instance which has Wordpress setup already having the security group allowing port 80 so that our client can connect to our wordpress site.Also attach the key to instance for further login into it.
6) Launch an ec2 instance which has MYSQL setup already with security group allowing port 3306 in private subnet so that our wordpress vm can connect with the same.Also attach the key with the same.
Wordpress instance has to be part of public subnet so that our client can connect our site.
mysql instance has to be part of private subnet so that outside world can't connect to it.
We write the entire code in vpc.tf file. As soon as we run the command terraform apply the entire architecture will be created.
PROVIDER
We have to mention that we want to use aws provider.
CREATING VPC
We have to mention ip address range we want for our vpc.
CREATING PUBLIC SUBNET
For creating public ip we have to mention that we want public ip .
CREATING PRIVATE SUBNET
CREATING INTERNET GATEWAY
CREATING ROUTE TABLE
CONNECTING PUBLIC SUBNET TO ROUTE TABLE
CREATING SECURITY GROUP FOR WORDPRESS INSTANCE
This security group allows port no. 80 for wordpress and port no. 22 for ssh to login into the instance.It has ICMP enabled also.
LAUNCHING WORDPRESS INSTANCE
CREATING SECURITY GROUP FOR MYSQL
LAUNCHING MYSQL INSTANCE
TERRAFORM APPLY COMMAND
This creates the entire architecture.
