Terraform

Using simple variables with Terraform for beginners

We can give all the variables and equal values in the source code tf files , but problem with that if you like to change the values , you have to modify everywhere in the main source code . It could be complex to implement in production env and it’s not easy to use.

So we can use variables in separate file , and refer those in the main source code .

Lets try to deploy security group with 3 input rules using variable in separate file .

variable file

here cidr_blocks values for each ingress rules not defined directly in the source code . Instead of that defined in variables.tf file. You can declare with any name for “onprem_ip”.

you can refer this in source code as “var.onprem_ip” . The advantage here is next time if you like to change the ip just update in varaibles.tf file onprem_ip default value to new desired value .

Now lets chane onprem_ip in variables.tf file and try

Now inbound rules source ip changed to 20.16.2.1/32.

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