IP Networks Example

This terraform configuration creates an example IP network topology based on the scenario illustrated in the Oracle Compute Cloud About IP Networks documentation.

This example configures the IP Networks and IP Address on the IP Networks as shown in the diagram. The Private IP Addresses on the Shared Network, and two Public IP Addresses will vary as they are dynamically allocated.

In addition this example also configures an SSH key for access to all of the instances and copies the ssh private key to the Instance_3 and Instance_4 to enable sshing through the instances on the private IP networks.

This configuration will create:

• 5 Compute Instances: Instance_1, Instance_2, Instance_3, Instance_4, Instance_5
• 3 IP Networks: IP_Network1, IP_Network2, IP_Network3
• 1 IP Network Exchange: IPExchange
• 1 SSH Key: ip-network-example-key
• 2 Public IP Reservations: reservation1, reservation2

Usage

Set account variables

Create a terraform.tfvars to set the Oracle Compute Cloud authentication credentials.

Setup SSH Keys for instance access

First create an ssh key pair to be used access the instances. The following will create id_rsa and id_rsa.pub in the local directory.

$ ssh-keygen -f ./id_rsa -N "" -q

Alternatively the ssh_public_key and ssh_private_key variables can be set in terraform.tfvars to the file location of an existing ssh key pair.

Apply the configuration

This example uses modules, to prepare terraform the use the module first run

$ terraform get

Review the configuraion terraform will create

$ terraform plan

Now apply the configuration

$ terraform apply

Wait for the configuration to complete

Access the instances and check the configuration

You can ssh directly to Instance_3 and Instance_4. The Public IP Addresses assinged to these instances is output at the end of the terraform apply.

e.g. SSH to Instance_3

$ ssh [email protected] -i ./id_rsa

Once connected to the Instance_3 you can access Instance_2 and Instance_1 using the staically assigned IP addresses in the IP Networks. Instance_4 and Instance_5 are not accessable from Instance_3 as they are on a different IP Network.

[opc@instance3 ~]$ ping 192.168.3.11
PING 192.168.3.11 (192.168.3.11) 56(84) bytes of data.
64 bytes from 192.168.3.11: icmp_seq=1 ttl=64 time=0.586 ms

[opc@instance3 ~]$ ssh [email protected]
[opc@instance1 ~]$

Destroy the configuration

Cleanup all instances and resources created

$ terraform destroy