Cloudformation template to provision three-tier App

The CloudFormation template will create TomCat Web Server, Jenkins Server, and 2 MySQL multi-master replication:

• Download, install and configure Tomcat on Ubuntu instance.
• Download, install Jenkins server.
• Download MySQL on 2 ubuntu instances and create multi-master replication between these 2 instances

The template accepts the below parameters from the user:

• Instance Type (only t2.micro and t2.nano, and can be changed in the parameters section or using cfn mappings).
• SSH Key (select one from existence keys).
• Jenkins port number.
• Root volume size.
• Default availability zone.
• The Class B of the VPC (10.xxx.0.0/16), so if you enter 10, it will be 10.10.0.0/16

The CloudFormation will provision:

• VPC.
• 2 public subnets
• 2 private subnets
• Internet gateway for the public subnet
• Route tables for all subnets
• Route tables associations
• NACL for all subnets
• Security group to allow internet traffic from port 443 to the public subnet
• Security group to allow internal traffci from port 3360 t othe private subnet

• 4 instances as shown below

Instance	Subnet	Details
Jenkins Instance	Public Subnet A	Install Jenkins server
Tomcat server	Private Subnet A	Install and configure Tomcat server
MySQL master 1	Private Subnet A	MySQL multi-master replication
MySQL master 2	Private Subnet B	MySQL multi-master replication

The below are the IP ranges used for the subnets created:

Public Subnet A	Private Subnet A	Private Subnet A
10.xxx.0.0/20	10.xxx.16.0/20	10.xxx.48.0/20

NACLs and SGs are configured to allow all outbound, and inbound as below:

	NACL Public A	NACL Private A	NACL Private B
Port	443	443	3306
CIDR	0.0.0.0/0	10.xxx.0.0/20	3306