If you are running Keystone using the Eventlet-based process, you will use the keystone-all command to start the Keystone services. This command will start both the Service API and the Administration API in a single process.
You can confirm that Keystone was started successfully by running ps -aux | grep keystone, which should show you several keystone-all processes. The output should look similar to the following output:
You can also check this by running pgrep -l keystone. The output from this command should look similar to this output:
You can use the openstack client or the keystone command-line client to double check whether Keystone is running properly. Before you use the client, make sure that you have sourced the credentials in your openrc file or be prepared to pass the required auth attributes in with the command. If you forget to take one of these steps, you may see an error like the following...