Introduction to Keystone API

Keystone API is a robust and versatile framework used for identity services in OpenStack. This guide provides an in-depth look into the numerous APIs offered by Keystone, complete with practical examples and code snippets to help you effectively integrate and utilize these APIs in your application.

Keystone API Overview

Keystone offers a plethora of APIs for various identity management tasks. Here are some of the most commonly used APIs:

Creating a User

This API allows you to create a new user in the Keystone identity service.

 POST /v3/users {
  "user": {
    "name": "newuser",
    "domain_id": "default",
    "password": "supersecret"
  }
} 

Listing Users

This API retrieves a list of all users.

 GET /v3/users 

Getting User Details

This API fetches details of a specific user by their ID.

 GET /v3/users/{user_id} 

Updating a User

This API updates information about a specified user.

 PATCH /v3/users/{user_id} {
  "user": {
    "email": "newemail@example.com"
  }
} 

Deleting a User

This API deletes a user with a given ID.

 DELETE /v3/users/{user_id} 

Creating a Project

This API is used to create a new project under a specified domain.

 POST /v3/projects {
  "project": {
    "name": "newproject",
    "domain_id": "default"
  }
} 

Listing Projects

This API retrieves a list of all projects.

 GET /v3/projects 

Application Example using Keystone APIs

Below is an example of a simple application that utilizes the Keystone APIs to manage users and projects:

 import requests
BASE_URL = "http://keystone.example.com:5000/v3" TOKEN = "your-auth-token"
def create_user(name, password, domain_id):
    url = f"{BASE_URL}/users"
    headers = {"X-Auth-Token": TOKEN, "Content-Type": "application/json"}
    data = {
        "user": {
            "name": name,
            "domain_id": domain_id,
            "password": password
        }
    }
    response = requests.post(url, json=data, headers=headers)
    return response.json()

def list_users():
    url = f"{BASE_URL}/users"
    headers = {"X-Auth-Token": TOKEN}
    response = requests.get(url, headers=headers)
    return response.json()
    
# Creating a user user = create_user("newuser", "supersecret", "default") print("Created User:", user)
# Listing users users = list_users() print("List of Users:", users) 

In this example, we define two functions create_user and list_users that interact with the Keystone API to create a new user and list existing users, respectively.

Utilizing Keystone APIs, developers can efficiently manage user and project identities within OpenStack environments, significantly easing the management of complex cloud infrastructures.

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