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14.2.4 Running Terraform Configuration
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Run the command window
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Go to the path where the configuration file is located
[opc@bastion-host example_vcn]$ ls -la total 12 drwxrwxr-x. 2 opc opc 63 Jan 18 09:50 . drwxrwxr-x. 3 opc opc 25 Jan 18 09:46 .. -rw-rw-r--. 1 opc opc 359 Jan 18 09:47 provider.tf -rw-rw-r--. 1 opc opc 479 Jan 18 09:50 terraform.tfvars -rw-rw-r--. 1 opc opc 284 Jan 18 09:47 vcn.tf -
Run initialization
When initialization is performed, the OCI Provider used by provider.tf is automatically downloaded under the .terraform folder.
terraform init- Execution example
[opc@bastion-host example_vcn]$ terraform init Initializing the backend... Initializing provider plugins... - Finding latest version of hashicorp/oci... - Installing hashicorp/oci v4.59.0... - Installed hashicorp/oci v4.59.0 (signed by HashiCorp) ... [opc@bastion-host example_vcn]$ ls -la total 20 drwxrwxr-x. 3 opc opc 4096 Jan 18 09:51 . drwxrwxr-x. 3 opc opc 25 Jan 18 09:46 .. drwxr-xr-x. 3 opc opc 23 Jan 18 09:51 .terraform -rw-r--r--. 1 opc opc 1002 Jan 18 09:51 .terraform.lock.hcl -rw-rw-r--. 1 opc opc 359 Jan 18 09:47 provider.tf -rw-rw-r--. 1 opc opc 479 Jan 18 09:50 terraform.tfvars -rw-rw-r--. 1 opc opc 284 Jan 18 09:47 vcn.tf [opc@bastion-host example_vcn]$ ls -la .terraform total 4 drwxr-xr-x. 3 opc opc 23 Jan 18 09:51 . drwxrwxr-x. 3 opc opc 4096 Jan 18 09:51 .. drwxr-xr-x. 3 opc opc 35 Jan 18 09:51 providers -
Check the execution plan
If you run the plan command, you can see the plan that is being carried out on the actual OCI.
terraform plan- Execution example
[opc@bastion-host example_vcn]$ terraform plan Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols: + create Terraform will perform the following actions: # oci_core_virtual_network.vcn1 will be created + resource "oci_core_virtual_network" "vcn1" { + cidr_block = "10.0.0.0/16" + cidr_blocks = (known after apply) + compartment_id = "ocid1.compartment.oc1..aaaaaaaaqcgintvsf3giria27rztelhvr4n6gra5wcvtj2bxzm3ukrk7aq7q" + default_dhcp_options_id = (known after apply) + default_route_table_id = (known after apply) + default_security_list_id = (known after apply) + defined_tags = (known after apply) + display_name = "vcn1" + dns_label = "vcn1" + freeform_tags = (known after apply) + id = (known after apply) + ipv6cidr_blocks = (known after apply) + is_ipv6enabled = (known after apply) + state = (known after apply) + time_created = (known after apply) + vcn_domain_name = (known after apply) } Plan: 1 to add, 0 to change, 0 to destroy. Changes to Outputs: + vcn1_ocid = [ + (known after apply), ] ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if you run "terraform apply" now. -
Run
When executed, the Terraform plan is applied to the actual OCI, creating the associated OCI resource. Also, after execution, you can query the outout variable through the terraform output command.
terraform apply-
Execution example
[opc@bastion-host example_vcn]$ terraform apply Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols: + create Terraform will perform the following actions: # oci_core_virtual_network.vcn1 will be created + resource "oci_core_virtual_network" "vcn1" { + cidr_block = "10.0.0.0/16" + cidr_blocks = (known after apply) + compartment_id = "ocid1.compartment.oc1..aaaaaaaaqcgintvsf3giria27rztelhvr4n6gra5wcvtj2bxzm3ukrk7aq7q" + default_dhcp_options_id = (known after apply) + default_route_table_id = (known after apply) + default_security_list_id = (known after apply) + defined_tags = (known after apply) + display_name = "vcn1" + dns_label = "vcn1" + freeform_tags = (known after apply) + id = (known after apply) + ipv6cidr_blocks = (known after apply) + is_ipv6enabled = (known after apply) + state = (known after apply) + time_created = (known after apply) + vcn_domain_name = (known after apply) } Plan: 1 to add, 0 to change, 0 to destroy. Changes to Outputs: + vcn1_ocid = [ + (known after apply), ] Do you want to perform these actions? Terraform will perform the actions described above. Only 'yes' will be accepted to approve. Enter a value: yes oci_core_virtual_network.vcn1: Creating... oci_core_virtual_network.vcn1: Creation complete after 1s [id=ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q] Apply complete! Resources: 1 added, 0 changed, 0 destroyed. Outputs: vcn1_ocid = [ "ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q", ]
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Check the execution result
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Open the navigation menu in the OCI console. Go to Networking » Virtual Cloud Networks.
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Select the Comparment specified in Terraform Configuration.
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You can check the created VCN as shown in the picture.
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State Management
- When terraform apply is executed again, it is displayed that there is no change to apply because the resource has already been executed before and below.
[opc@bastion-host example_vcn]$ terraform apply oci_core_virtual_network.vcn1: Refreshing state... [id=ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q] No changes. Your infrastructure matches the configuration. Terraform has compared your real infrastructure against your configuration and found no differences, so no changes are needed. Apply complete! Resources: 0 added, 0 changed, 0 destroyed. Outputs: vcn1_ocid = [ "ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q", ]-
Terraform State management files
When terraform setting is executed, terraform.tfstate file is created as shown below after execution, and resource status is managed by recording id and related properties of the created resource. So, even if terraform apply is executed again, the current state of the OCI resource of the id managed by tfstate is checked (refreshed) and the plan to be applied is compared with the state to be changed, and then reflected.
[opc@bastion-host example_vcn]$ ls -la total 24 drwxrwxr-x. 3 opc opc 4096 Jan 18 10:06 . drwxrwxr-x. 3 opc opc 25 Jan 18 09:46 .. drwxr-xr-x. 3 opc opc 23 Jan 18 09:51 .terraform -rw-r--r--. 1 opc opc 1002 Jan 18 09:51 .terraform.lock.hcl -rw-rw-r--. 1 opc opc 359 Jan 18 09:47 provider.tf -rw-rw-r--. 1 opc opc 2152 Jan 18 10:06 terraform.tfstate -rw-rw-r--. 1 opc opc 479 Jan 18 09:50 terraform.tfvars -rw-rw-r--. 1 opc opc 284 Jan 18 09:47 vcn.tf [opc@bastion-host example_vcn]$ cat terraform.tfstate { "version": 4, "terraform_version": "1.1.3", "serial": 2, "lineage": "b9cd2a13-5ef9-f1e1-ffc9-ea5b2964955d", "outputs": { "vcn1_ocid": { "value": [ "ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q" ], "type": [ "tuple", [ "string" ] ] } }, "resources": [ { "mode": "managed", "type": "oci_core_virtual_network", "name": "vcn1", "provider": "provider[\"registry.terraform.io/hashicorp/oci\"]", "instances": [ { "schema_version": 0, "attributes": { "cidr_block": "10.0.0.0/16", "cidr_blocks": [ "10.0.0.0/16" ], "compartment_id": "ocid1.compartment.oc1..aaaaaaaaqcgintvsf3giria27rztelhvr4n6gra5wcvtj2bxzm3ukrk7aq7q", "default_dhcp_options_id": "ocid1.dhcpoptions.oc1.ap-seoul-1.aaaaaaaaun4ti33kubad7cqexhe4npgwy773lldor7xxfbbu2lu5yz3q6uaa", "default_route_table_id": "ocid1.routetable.oc1.ap-seoul-1.aaaaaaaammsdhhl7czlkrxeji7eqot6tkiyfcvrhuqvf4hh3cra3rt3m2e2a", "default_security_list_id": "ocid1.securitylist.oc1.ap-seoul-1.aaaaaaaadmiqjfjkiw7k73lxwbilgci2xrzehxud3ezfujmt3gtjenocsoaa", "defined_tags": { "Oracle-Tags.CreatedBy": "sandboxer", "Oracle-Tags.CreatedOn": "2022-01-18T10:00:51.322Z" }, "display_name": "vcn1", "dns_label": "vcn1", "freeform_tags": {}, "id": "ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q", "ipv6cidr_blocks": [], "is_ipv6enabled": false, "state": "AVAILABLE", "time_created": "2022-01-18 10:00:51.389 +0000 UTC", "timeouts": null, "vcn_domain_name": "vcn1.oraclevcn.com" }, "sensitive_attributes": [], "private": "eyJlMmJmYjczMC1lY2FhLTExZTYtOGY4OC0zNDM2M2JjN2M0YzAiOnsiY3JlYXRlIjoxMjAwMDAwMDAwMDAwLCJkZWxldGUiOjEyMDAwMDAwMDAwMDAsInVwZGF0ZSI6MTIwMDAwMDAwMDAwMH19" } ] } ] }
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Delete
To delete the resource previously created with Terraform, you can run the following command:
terraform destroy-
Execution example
[opc@bastion-host example_vcn]$ terraform destroy oci_core_virtual_network.vcn1: Refreshing state... [id=ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q] Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols: - destroy Terraform will perform the following actions: # oci_core_virtual_network.vcn1 will be destroyed - resource "oci_core_virtual_network" "vcn1" { - cidr_block = "10.0.0.0/16" -> null - cidr_blocks = [ - "10.0.0.0/16", ] -> null - compartment_id = "ocid1.compartment.oc1..aaaaaaaaqcgintvsf3giria27rztelhvr4n6gra5wcvtj2bxzm3ukrk7aq7q" -> null - default_dhcp_options_id = "ocid1.dhcpoptions.oc1.ap-seoul-1.aaaaaaaaun4ti33kubad7cqexhe4npgwy773lldor7xxfbbu2lu5yz3q6uaa" -> null - default_route_table_id = "ocid1.routetable.oc1.ap-seoul-1.aaaaaaaammsdhhl7czlkrxeji7eqot6tkiyfcvrhuqvf4hh3cra3rt3m2e2a" -> null - default_security_list_id = "ocid1.securitylist.oc1.ap-seoul-1.aaaaaaaadmiqjfjkiw7k73lxwbilgci2xrzehxud3ezfujmt3gtjenocsoaa" -> null - defined_tags = { - "Oracle-Tags.CreatedBy" = "sandboxer" - "Oracle-Tags.CreatedOn" = "2022-01-18T10:00:51.322Z" } -> null - display_name = "vcn1" -> null - dns_label = "vcn1" -> null - freeform_tags = {} -> null - id = "ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q" -> null - ipv6cidr_blocks = [] -> null - is_ipv6enabled = false -> null - state = "AVAILABLE" -> null - time_created = "2022-01-18 10:00:51.389 +0000 UTC" -> null - vcn_domain_name = "vcn1.oraclevcn.com" -> null } Plan: 0 to add, 0 to change, 1 to destroy. Changes to Outputs: - vcn1_ocid = [ - "ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q", ] -> null Do you really want to destroy all resources? Terraform will destroy all your managed infrastructure, as shown above. There is no undo. Only 'yes' will be accepted to confirm. Enter a value: yes oci_core_virtual_network.vcn1: Destroying... [id=ocid1.vcn.oc1.ap-seoul-1.amaaaaaansfh2iiaduerl4znqr6sb2yng6j7x2yov4kqrsuhi452pcjxl52q] oci_core_virtual_network.vcn1: Destruction complete after 1s Destroy complete! Resources: 1 destroyed. -
Execution result
You can see vcn1 is gone as shown below.
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As an individual, this article was written with my personal time. There may be errors in the content of the article, and the opinions in the article are personal opinions.