Prepare to Provision the Infrastructure Resources

Install Terraform on the on-premises source database host system and generate the required keys to create the infrastructure resources in Oracle Cloud.

Install Terraform

Terraform is a third-party tool that you can use to efficiently provision and manage resources in Oracle Cloud Infrastructure.

On UNIX-like or Linux systems, including Oracle Linux, you can install Terraform by downloading and extracting the Terraform package for your operating system.

Install Terraform version 0.12.16+ on a local computer.

1. Go to https://releases.hashicorp.com/terraform/.
2. Click the required version, and download the appropriate package depending on your operating system.
3. Extract the package to the path /usr/local/bin/.
   You can extract Terraform to any other directory on your local host. Ensure that the directory is included in the PATH variable.
   Terraform is installed and ready to use.
4. Verify the installation.

   terraform -v

   The Terraform version is displayed.

Generate an API Signing Key

You must provide an RSA key pair in the privacy-enhanced mail (PEM) format to enable Terraform to authenticate with Oracle Cloud Infrastructure. Note that this API signing key is not the same as the SSH key pair that you use to access your instances. You can use OpenSSL to generate the API signing key.

1. Create a hidden subdirectory in your home directory to store the PEM key.

   mkdir ~/.oci

2. Generate a private key (size: 2048 bits or higher).

   openssl genrsa -out ~/.oci/key_name.pem 2048

3. Change the permissions on the private key file, to ensure that only you can read the key.

   chmod go-rwx ~/.oci/key_name.pem

4. Generate the public key for the private key.

   openssl rsa -pubout -in ~/.oci/key_name.pem -out ~/.oci/key_name_public.pem

You can store the keys in any directory of your choice.

Make a note of the location.

Upload the API Signing Key Using the Console

After you generate an API signing key, you must upload the public key for the associated user in Oracle Cloud Infrastructure. The first time you upload an API signing key, you must use the web console. Subsequently, you can also use the API to upload an API key.

1. Sign in to the Oracle Cloud Infrastructure Console.
2. From the services menu, select Identity, and then select Users.
3. On the Users page, click the user you want to upload the key for.
4. On the user details page, click Add Public Key.
5. Copy the public key value from the ~/.oci/key_name_public.pem file, and paste it in the PUBLIC KEY field.
6. Click Add.
   The key is uploaded, and its fingerprint is displayed.
7. Copy the fingerprint. You'll need it later.

Generate an SSH Key Pair for the Bastion Host

An SSH key pair is used to enable secure access to instances. You generate an key pair on your local host. The Terraform modules then add the public key to the bastion host. When you connect to the bastion host, you provide the private key to authenticate access.

• Use the ssh-keygen utility and generate an SSH key pair. Don’t set a passphrase for the key pair.

  ssh-keygen -t rsa -N "" -b 2048 -C "key_name" -f path/root_name

  • -t rsa: Specifies that the key pair should be generated using the RSA algorithm

  • -N "": Specifies the passphrase that you want to associate with this key pair. Don’t enter anything between the quotation marks. Create the key pair without a passphrase.

  • -b 2048: Specifies that you want to generate a 2048-bit key. This value is the default (and the minimum recommended) value.

  • -C "key_name": Specifies the name of the key pair.

  • -f path/root_name: Specifies the directory where the key pair is saved and the root name for the public and private key. The public key has .pub appended to the root name.

The SSH key pair is generated and saved in the directory that you specified. Make a note of the full path and name of the key files.