Managing Default VCN Resources

When you create an oci_core_vcn resource, it will also create the following associated resources by default:

• oci_core_security_list
• oci_core_dhcp_options
• oci_core_route_table

These default resources will be implicitly created even if they are not specified in the Terraform configuration. Their OCIDs are returned by the following attributes under the oci_core_vcn resource:

• default_security_list_id
• default_dhcp_options_id
• default_route_table_id

Default resources must be configured in Terraform using a separate resource type. Here are the mappings between the resource and the new resource type to use for configuring default resources:

• oci_core_security_list => oci_core_default_security_list
• oci_core_dhcp_options => oci_core_default_dhcp_options
• oci_core_route_table => oci_core_default_route_table

Default resources types are configured in the same way as their non-default counterparts. The only difference is specifying the ID of the default resource using the manage_default_resource_id argument.

Consequently, the vcn_id is no longer necessary for default resources.

The following example modifies a VCN's default route table and DHCP options:

resource "oci_core_vcn" "vcn1" {
  cidr_block = "10.0.0.0/16"
  dns_label = "vcn1"
  compartment_id = var.compartment_id
  display_name = "vcn1"
}

# Gateway
## Internet Gateway
resource "oci_core_internet_gateway" "inetGw" {
    compartment_id = var.compartment_id
    display_name   = "inetGw"
    vcn_id         = oci_core_vcn.vcn1.id
}

resource "oci_core_default_dhcp_options" "default-dhcp-options" {
  manage_default_resource_id = oci_core_vcn.vcn1.default_dhcp_options_id

  #Required
  options {
    type = "DomainNameServer"
    server_type = "VcnLocalPlusInternet"
  }
}

  #Optional
  options {
    type = "SearchDomain"
    search_domain_names = [ "abc.com" ]
  }
}

resource "oci_core_default_route_table" "default-route-table" {
  manage_default_resource_id = oci_core_vcn.vcn1.default_route_table_id

    #Required
    compartment_id = var.compartment_id

    #Optional
    display_name = "default_route_table"
    route_rules {

        #Required
        network_entity_id = oci_core_internet_gateway.inetGw.id

        #Optional
        destination = "0.0.0.0/0"
        destination_type = "CIDR_BLOCK"
    }
}