Terraform (contd)

• Third way of Authentication & Authorization in AWS using CLI
  • Install AWS CLI Refer Here
• Current state of Terraform Template:
  • The template create a vpc with fixed cidr range in a fixed region.
• Lets try to make the template generic
  • A variable in a terraform template can accept the input from the user
  • for input variables Refer Here
• For the changes done Refer Here
• Desigining Varaibles:
  • Ensure you have right set of optional variable (Variable with default ) & required variables
  • In many cases too many variables is not a good design. If the values can be calculated try calculating them
• To apply above mentioned best practices, lets calculate subnet cidr ranges, for this lets take help from terraform functions Refer Here and expressions Refer Here
• Finding cidrsubnet functions. Refer Here
• Refer Here for the changes
• For AZs lets use format function of string Refer Here
• Each Region in AWS will have different az’s and lets configure this Refer Here for the changes