Oracle Cloud Infrastructure (OCI) provides a wide range of cloud services, and these services can be managed and configured using OCI’s REST API. Below are some key aspects to consider when working with OCI APIs:

Authentication

Authentication in OCI typically involves creating a private/public key pair. The public key is uploaded to the Oracle Cloud dashboard, and the private key is used for signing API requests.

API Endpoint

API endpoints differ based on the cloud service you are interacting with and the data center/region. The base format usually looks like:

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https://service.region.oraclecloud.com/resource_path

API Request Format

A typical API request to Oracle Cloud Infrastructure uses HTTPS methods like GET, POST, PUT, and DELETE. Headers usually include Authorization, opc-request-id, and Content-Type.

Code Example

Here’s a Python example using the requests library to list all the instances in a compartment:

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import requests

from oci import signers

# Initialize the signer with the user’s private key, user OCID, tenant OCID, and public fingerprint

signer = signers.get_api_signer(

    private_key_file_location=’path/to/private_key.pem’,

    api_key_fingerprint=’API_KEY_FINGERPRINT’,

    user_ocid=’USER_OCID’,

    tenancy_ocid=’TENANCY_OCID’

)

# Prepare the request

compartment_id = ‘YOUR_COMPARTMENT_ID’

endpoint = f’https://iaas.us-phoenix-1.oraclecloud.com/20160918/instances?compartmentId={compartment_id}’

method = ‘GET’

headers = {

    ‘Content-Type’: ‘application/json’,

    ‘opc-request-id’: ‘unique-request-id’

}

# Sign the request

signer.sign(method, headers, None, endpoint)

# Make the API request

response = requests.get(endpoint, headers=headers)

if response.status_code == 200:

    print(response.json())

else:

    print(f’Failed to list instances: {response.content}’)

Rate Limiting

OCI APIs have rate limits, so when sending bulk requests, ensure to handle 429 – Too Many Requests errors.