Using OpenStack Compute

OpenStack Identity Service underpins all of the OpenStack services. With OpenStack Image Service configured to use OpenStack Identity Service, the OpenStack Compute environment can now be used.

Getting ready

To begin with, log in to an Ubuntu client and ensure that Nova client is available. If it isn’t, it can be installed as follows:

sudo apt-get update
sudo apt-get python-novaclient

How to do it...

To use OpenStack Identity Service as the authentication mechanism in our OpenStack environment, we need to set our environment variables accordingly. For our demo user, this is achieved as follows:

  1. With the Nova client installed, we use them by configuring our environment with the appropriate environment variables. We do this as follows:
    export OS_TENANT_NAME=cookbook
export OS_USERNAME=admin
export OS_PASSWORD=openstack
export OS_AUTH_URL=https://192.168.100.200:5000/v2.0/
export OS_NO_CACHE=1
export OS_KEY=/vagrant/cakey.pem
export OS_CACERT=/vagrant/ca.pem

    Tip

    Add these to a file called novarc in your home area. We can then source these credentials each time by simply executing the following command:

    novarc

    Note that if the user credential environment variables have been set in a shell that has the SERVICE_TOKEN and SERVICE_ENDPOINT environment variables. These will override our user credentials set in this step. Remove the SERVICE_TOKEN and SERVICE_ENDPOINT variables before continuing.

  2. To access any Linux instances that we launch, we must create a key pair that allows us to access our cloud instance. Key pairs are SSH private and public key combinations that together allow you to access a resource. You keep the private portion safe, but you’re able to give the public key to anyone or any computer without fear or compromise to your security. However, only your private portion will match enabling you to be authorized. Cloud instances rely on key pairs for access. We create a key pair using Nova client with the following commands:
    nova keypair-add demo > demo.pem 
chmod 0600 *.pem
  3. We can test that this is successful by issuing some nova commands, for example:
    nova list
nova credentials

How it works...

Configuring our environment to use OpenStack Identity Service for authentication for Nova client, so that we can launch our instances, involves manually creating an environment resource file with the appropriate environment variables in.

Our environment passes on our username, password, and tenant to OpenStack Identity Service for authentication and passes back—behind the scenes—an appropriate token that validates our user. This allows us to seamlessly spin up instances within our tenancy (project) of cookbook.

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