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To authenticate access to OpenStack services, you must first issue anauthentication request with a payload of credentials to OpenStack Identity toget an authentication token.

Credentials are usually a combination of your user name and password,and optionally, the name or ID of the project of your cloud.Ask your cloud administrator for your user name, password, and project sothat you can generate authentication tokens. Alternatively, you cansupply a token rather than a user name and password.

When you send API requests, you include the token in the X-Auth-Tokenheader. If you access multiple OpenStack services, you must get a token foreach service. A token is valid for a limited time before it expires. A tokencan also become invalid for other reasons. For example, if the roles for auser change, existing tokens for that user are no longer valid.

Authentication and API request workflow¶

1. Request an authentication token from the Identity endpoint that yourcloud administrator gave you. Send a payload of credentials in therequest as shown in Authenticate. If the request succeeds, the serverreturns an authentication token.

2. Send API requests and include the token in the X-Auth-Tokenheader. Continue to send API requests with that token until the servicecompletes the request or the Unauthorized (401) error occurs.

3. If the Unauthorized (401) error occurs, request another token.

The examples in this section use cURL commands. For information about cURL,see http://curl.haxx.se/. For information about the OpenStack APIs, seeCurrent API versions.

Authenticate¶

The payload of credentials to authenticate contains these parameters:

In a typical OpenStack deployment that runs Identity, you can specify yourproject name, and user name and password credentials to authenticate.

First, export your project name to the OS_PROJECT_NAME environmentvariable, your project domain name to the OS_PROJECT_DOMAIN_NAMEenvironment variable, your user name to the OS_USERNAMEenvironment variable, your password to the OS_PASSWORD environmentvariable and your user domain name to the OS_USER_DOMAIN_NAMEenvironment variable.

The example below uses an endpoint from an installation of Ocata by followingthe installation guide. However, you can also use $OS_AUTH_URL as anenvironment variable as needed to change the URL.

Then, run this cURL command to request a token:

If the request succeeds, it returns the Created(201) response codealong with the token as a value in the X-Subject-Token response header.The header is followed by a response body that has an object of typetoken which has the token expiration date and time in the form'expires_at':'datetime' along with other attributes.

The following example shows a successful response:

Note

In the above request, the query string nocatalog is used as youjust want to get a token and do not want the service catalog(if it is available for the user) cluttering the output.If a user wants to get the service catalog, this query string neednot be appended to the URL.

Send API requests¶

This section shows how to make some basic Compute API calls. For a completelist of Compute API calls, seeCompute API.

Export the token ID to the OS_TOKEN environment variable. For example:

The token expires every hour by default,though it can be configured differently - seethe expiration option in thethe Identity Service Configuration Guide.

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Export the project name to the OS_PROJECT_NAME environmentvariable. For example:

Then, use the Compute API to list flavors, substituting the ComputeAPI endpoint with one containing your project ID below:

Export the $OS_PROJECT_ID from the token call, and thenuse the Compute API to list images:

Export the $OS_PROJECT_ID from the token call, and thenuse the Compute API to list servers:

OpenStack command-line clients¶

For scripting work and simple requests, you can use a command-line client likethe openstack-client client. This client enables you to use the Identity,Compute, Block Storage, and Object Storage APIs through a command-lineinterface. Also, each OpenStack project has a related client project thatincludes Python API bindings and a command-line interface (CLI).

For information about the command-line clients, see OpenStackCommand-Line Interface Reference.

Install the clients¶

Use pip to install the OpenStack clients on a Mac OS X or Linux system. Itis easy and ensures that you get the latest version of the client from thePython Package Index. Also, pip lets youupdate or remove a package.

You must install the client for each project separately, but thepython-openstackclient covers multiple projects.

Install or update a client package:

Where PROJECT is the project name.

For example, install the openstack client:

To update the openstack client, run this command:

To remove the openstack client, run this command:

Before you can issue client commands, you must download and source theopenrc file to set environment variables.

For complete information about the OpenStack clients, including how to sourcethe openrc file, see OpenStack End User Guide,OpenStack Administrator Guide,and OpenStack Command-Line Interface Reference.

Launch an instance¶

To launch instances, you must choose a name, an image, and a flavor foryour instance.

To list available images, call the Compute API through the openstackclient:

To list flavors, run this command:

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To launch an instance, note the IDs of your desired image and flavor.

To launch the my_instance instance, run the openstackservercreatecommand with the image and flavor IDs and the server name:

Note

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For information about the default ports that the OpenStack components use,see Firewalls and default portsin the OpenStack Installation Guide.