Set Up a Simple Infrastructure with OCI Terraform

Use Terraform to set up a simple infrastructure in your Oracle Cloud Infrastructure account.

Key tasks include how to:

Copy existing scripts from other Terraform tutorials.
Edit the scripts to combine all the resources in one directory.
Run an apply command to create the following resources:
- a compartment
- a virtual cloud network
- a compute instance

A diagram of the components needed to create a simple Infrastructure with Terraform. From a local Linux environment, the user creates a virtual cloud network with Terraform. This network has a public subnet and a compuete instance that can be reached from the internet. The network also has a private subnet that connects to the internet through a NAT gateway, and also privately connects to the Oracle Services Network. The CIDR block for the virtual cloud network is 10.0.0.0/16, for the public subnet is 10.0.0.0/24, and for the private subnet is 10.0.1.0/24.A diagram of a user connected from a local machine to an Oracle Cloud Infrastructure tenancy.

For more information, see:

Before You Begin

To successfully perform this tutorial, you must have the following:

Requirements

1. Prepare

Copy the scripts you created in previous Terraform tutorials into a new directory.

Copy Declared Resources

In your $HOME directory, create a directory called tf-simple-infrastructure and change to that directory.
```
mkdir tf-simple-infrastructure
```
```
cd tf-simple-infrastructure
```
Copy the Terraform scripts from the tf-provider directory.
```
cp ../tf-provider/*.tf .
```
Note

Don't copy the state files (terraform.tfstate or terraform.tfstate.backup). These files contain the state of resources for their current directory. After you run the scripts in this new directory, you get a new state file.
Rename the outputs.tf file to outputs1.tf.
```
mv outputs.tf outputs1.tf
```
Copy the Terraform scripts from the tf-compartment directory.
```
cp ../tf-compartment/*.tf .
```
Note

Because you only need one provider file per directory, no harm is done when the copy command replaces one provider.tf file with another.
Rename the outputs.tf file to outputs2.tf.
```
mv outputs.tf outputs2.tf
```
Copy the Terraform scripts from the tf-compute directory.
```
cp ../tf-compute/*.tf .
```
Rename the outputs.tf file to outputs3.tf.
```
mv outputs.tf outputs3.tf
```
Copy the Terraform scripts from the tf-vcn directory.
```
cp ../tf-vcn/*.tf .
```
Rename the outputs.tf file to outputs4.tf.
```
mv outputs.tf outputs4.tf
```

Concatenate the four output files.

cat outputs1.tf outputs2.tf outputs3.tf outputs4.tf > outputs.tf

Remove the outputs1.tf, outputs2.tf, outputs3.tf, and outputs4.tf files from the tf-simple-infrastructure directory.
```
rm outputs1.tf outputs2.tf outputs3.tf outputs4.tf
```

Confirm that you have the following files in your directory.

ls

availability-domains.tf
compartment.tf
compute.tf
outputs.tf
private-security-list.tf
private-subnet.tf
provider.tf
public-security-list.tf
public-subnet.tf
vcn-module.tf
versions.tf

2. Edit the Scripts

Edit the scripts to assign a new name for your compartment and to replace all hard-coded OCIDs with references.

Update the Compartment Name

Open the compartment.tf file.

Update <your-compartment-name> with <your-new-compartment-name>, in case you already created <your-compartment-name> in the previous tutorials.

# Source from https://registry.terraform.io/providers/oracle/oci/latest/docs/resources/identity_compartment

resource "oci_identity_compartment" "tf-compartment" {
    # Required
    compartment_id = "<tenancy-ocid>"
    description = "Compartment for Terraform resources."
    name = "<your-new-compartment-name>"
}

Update Compartment References

Find the Reference to Compartment OCID

In the previous tutorials, you hard-coded the compartment OCID. Now, update <compartment-ocid> to reference the compartment from compartment.tf.

Find how the compartment OCID is referenced in the outputs.tf file.

grep -R compartment outputs.tf

Example output:

# Outputs for compartment
output "compartment-name" {
  value = oci_identity_compartment.tf-compartment.name
output "compartment-OCID" {
  value = oci_identity_compartment.tf-compartment.id

Copy the value for the compartment OCID into your notepad:
```
oci_identity_compartment.tf-compartment.id
```

Update Hard-Coded Compartment OCIDs

Find which files reference compartment_id.

grep -Rn compartment_id

Example output:

availability-domains.tf:7:  compartment_id = "<tenancy-ocid>"
compartment.tf:3:   compartment_id = "<tenancy-ocid>"
compute.tf:4:  compartment_id = "<compartment-ocid>"
private-security-list.tf:6:  compartment_id = "<compartment-ocid>"
private-subnet.tf:6:  compartment_id = "<compartment-ocid>"
public-security-list.tf:6:  compartment_id = "<compartment-ocid>"
public-subnet.tf:6:  compartment_id = "<compartment-ocid>"
vcn-module.tf:9:  compartment_id = "<compartment-ocid>"

Note

The availability-domains.tf and compartment.tf files both point to the <tenancy-ocid>. For example, the compartment.tf file points to the tenancy as its parent compartment and then creates a compartment underneath it. Don't edit the compartment_id in these two files.

Except for availability-domains.tf and compartment.tf files, in the remaining files that result from your grep command, replace compartment_id = "<compartment-ocid>" with:
```
compartment_id = oci_identity_compartment.tf-compartment.id
```

Update Subnet References

Find the Reference to Subnet OCID

In the tutorial Create a Compute Instance, you hard-coded the public subnet that hosts the compute instance. Now, update the compute.tf file to reference the public-subnet-OCID from the public-subnet.tf file.

Find how subnet OCID is referenced in the outputs.tf file.

grep -R subnet outputs.tf

Example output:

...
# Outputs for private subnet
output "private-subnet-name" {
  value = oci_core_subnet.vcn-private-subnet.display_name
output "private-subnet-OCID" {
  value = oci_core_subnet.vcn-private-subnet.id
# Outputs for public subnet
output "public-subnet-name" {
  value = oci_core_subnet.vcn-public-subnet.display_name
output "public-subnet-OCID" {
  value = oci_core_subnet.vcn-public-subnet.id

Copy the value for the public subnet OCID into your notepad:
```
oci_core_subnet.vcn-public-subnet.id
```

Update Hard-Coded Subnet OCIDs

Find which files reference subnet_id.

grep -Rn subnet_id

Example output:

compute.tf:19:        subnet_id = "<your-public-subnet-ocid>"

In the compute.tf file that results from your grep command, replace compartment_id = "<your-public-subnet-ocid>" with:
```
subnet_id = oci_core_subnet.vcn-public-subnet.id
```

Congratulations! All your scripts are now ready to run.

3. Create a Simple Infrastructure

Run your Terraform scripts to create a compartment, a virtual cloud network, and a compute instance in the public subnet.

Run the Scripts

Initialize a working directory in the tf-simple-infrastructure directory.
```
terraform init
```

Create an execution plan and review the changes that Terraform plans to make to your account:

terraform plan

Example output:

....
Terraform will perform the following actions:

  # oci_core_instance.ubuntu_instance will be created
....
Plan: 14 to add, 0 to change, 0 to destroy.

Changes to Outputs:
  + all-availability-domains-in-your-tenancy              = [
....

Create your simple infrastructure with Terraform:
```
terraform apply
```
When prompted for confirmation, enter yes, for your resources to be created.

Watch the Creation in the Console (Optional)

Review the Outputs

Review the outputs in the output terminal.

Example of output displayed in terminal:

oci_identity_compartment.tf-compartment: Creating...
oci_identity_compartment.tf-compartment: Creation complete after 7s [id=xxx]
module.vcn.oci_core_vcn.vcn: Creating...
module.vcn.oci_core_vcn.vcn: Creation complete after 2s [id=xxx]
module.vcn.oci_core_internet_gateway.ig[0]: Creating...
module.vcn.oci_core_nat_gateway.nat_gateway[0]: Creating...
module.vcn.oci_core_default_security_list.lockdown[0]: Creating...
module.vcn.oci_core_service_gateway.service_gateway[0]: Creating...
oci_core_security_list.private-security-list: Creating...
oci_core_security_list.public-security-list: Creating...
module.vcn.oci_core_internet_gateway.ig[0]: Creation complete after 1s [id=xxx]
module.vcn.oci_core_route_table.ig[0]: Creating...
oci_core_security_list.public-security-list: Creation complete after 1s [id=xxx]
module.vcn.oci_core_default_security_list.lockdown[0]: Creation complete after 1s [id=xxx]
oci_core_security_list.private-security-list: Creation complete after 1s [id=xxx]
module.vcn.oci_core_route_table.ig[0]: Creation complete after 1s [id=xxx]
oci_core_subnet.vcn-public-subnet: Creating...
module.vcn.oci_core_nat_gateway.nat_gateway[0]: Creation complete after 2s [id=xxx]
module.vcn.oci_core_service_gateway.service_gateway[0]: Creation complete after 3s [id=xxx]
module.vcn.oci_core_route_table.service_gw[0]: Creating...
module.vcn.oci_core_route_table.nat[0]: Creating...
module.vcn.oci_core_route_table.service_gw[0]: Creation complete after 0s [id=xxx]
module.vcn.oci_core_route_table.nat[0]: Creation complete after 1s [id=xxx]
oci_core_subnet.vcn-private-subnet: Creating...
oci_core_subnet.vcn-public-subnet: Creation complete after 2s [id=xxx]
oci_core_instance.ubuntu_instance: Creating...
oci_core_subnet.vcn-private-subnet: Creation complete after 2s [id=xxx]
oci_core_instance.ubuntu_instance: Still creating... [10s elapsed]
oci_core_instance.ubuntu_instance: Still creating... [20s elapsed]
oci_core_instance.ubuntu_instance: Still creating... [30s elapsed]
oci_core_instance.ubuntu_instance: Creation complete after 38s [id=xxx]

Apply complete! Resources: 14 added, 0 changed, 0 destroyed.

References:

What's Next

Congratulations! You have successfully created a simple infrastructure using Terraform, in your Oracle Cloud Infrastructure account.

Now that you know how to use data sources, resources and modules, go ahead and add new objects from Oracle Cloud Infrastructure Provider to your simple infrastructure.

To explore more information about development with Oracle products, check out these sites:

Oracle Cloud Infrastructure Documentation Try Free Tier

Set Up a Simple Infrastructure with OCI Terraform

Before You Begin 🔗

1. Prepare 🔗

2. Edit the Scripts 🔗

3. Create a Simple Infrastructure 🔗

What's Next 🔗

Oracle Cloud Infrastructure Documentation
Try Free Tier

Before You Begin

1. Prepare

2. Edit the Scripts

3. Create a Simple Infrastructure

What's Next