DevOps Classroom Series – 07/Mar/2021

Terraform in AWS

• Now we need to create a database instance in aws

• To create a database

  • we need to create a db subnet group which specifies database subnets
  • We need to create a rds db instance with mysql/postgres/oracle/sqlserver.
  • In this series i will be creating a mysql based rds instance

• Manual Steps:

  • Create a db subnet group

• Terraform:

  • Lets create a new file called as rds.tf
  • The resource for db subnet group Refer Here
  • Refer Here for the changeset

• Now we need to create a db instance. Manual Steps are shown below

• Now lets try to create a db instance from terraform provider documentation. Refer Here

• Refer Here for the changes added to create rds instance

• Now we are supposed to create ec2 instances in app subnet and web subnet

• Lets refactor the terraform template so that we have network.tf to create network elements , rds.tf to create database elements

• Since having one large network.tf is not readable lets create multiple tf files

• Refer Here for the changeset

• So we need to create ec2 instance in web subnet and install required softwares and deploy the application and same scenario for app subnet

• So this is just not creation of resource, we need to login into vm’s (ec2 instances) from terraform and execute the application deployment script (shell script/Chef cookbook/Ansible)

• The above operations are referred as provisioning