DevOps Classroomnotes 23/Dec/2021

Activity 2 AWS infra continued

• Adding Database:
• Creating Db subnet group from two db subnets Refer Here
• Now lets create a database from the resource Refer Here.
• Refer Here for the changes done
• Generally it is a good idea to show some outputs to the users whenever they execute terraform apply
• For writing outputs Refer Here for official documentation
• Lets add two simple outputs and see the terraform output while apply

output "web1_publicip" {
    value = aws_instance.web_instance_1.public_ip
}

output "db_endpoint" {
    value = aws_db_instance.db.endpoint
}

* Lets create more outputs
* vpc id
* subnet id
* security group ids
* ec2 ip address
* db endpoint
* ec2 url => http://<publicip>

• Terraform has inbuilt functions which will help us Refer Here
• Now applying format function and using the outputs section Refer Here for the changes.
  

Dependencies in Terraform

• We can generate a graph from terraform command which will generate dot format, which can be used to create a graph
  
• Terraform has two kinds of dependencies
• implicit
  • Created by referring attributes of one resource in another
• explicit
  • Using depends_on