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2.10. Example: Creating NFS Data Storage using Python

When a Red Hat Enterprise Virtualization environment is first being created it is necessary to define at least a data storage domain, and an ISO storage domain. The data storage domain will be used to store virtual machine disk images while the ISO storage domain will be used to store installation media for guest operating systems.
The API class provides access to a storage domains collection, named storagedomains. This collection contains all the storage domains in the environment. The storagedomains collection can also be used to add and remove storage domains.

Note

The code provided in this example assumes that the remote NFS share has been pre-configured for use with Red Hat Enterprise Virtualization. Refer to the Red Hat Enterprise Virtualization Administration Guide for more information on preparing NFS shares for use.

Example 2.9. Creating NFS data storage using Python

This Python example adds an NFS data domain to the storagedomains collection. Adding an NFS storage domain in Python can be broken down into several steps:
  1. Identify the data center to which the storage must be attached, using the get method of the datacenters collection. 
    dc = api.datacenters.get(name="Default")
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  2. Identify the host that must be used to attach the storage, using the get method of the hosts collection. 
    h = api.hosts.get(name="Atlantic")
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  3. Define the Storage parameters for the NFS storage domain. In this example the NFS location 192.0.43.10/storage/data is being used. 
    s = params.Storage(address="192.0.43.10", path="/storage/data", type_="nfs")
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  4. Request creation of the storage domain, using the add method of the storagedomains collection. In addition to the Storage parameters it is necessary to pass:
    • A name for the storage domain.
    • The data center object that was retrieved from the datacenters collection.
    • The host object that was retrieved from the hosts collection.
    • The type of storage domain being added (data, iso, or export).
    • The storage format to use (v1, v2, or v3).
Once these steps are combined, the completed script is: 
from ovirtsdk.api import API
from ovirtsdk.xml import params

try:
    api = API (url="https://HOST",
               username="USER@DOMAIN",
               password="PASS",
               ca_file="ca.crt")

    dc = api.datacenters.get(name="Default")
    h = api.hosts.get(name="Atlantic")

    s = params.Storage(address="192.0.43.10", path="/storage/data", type_="nfs")
    sd_params = params.StorageDomain(name="data1", data_center=dc, host=h, type_="data", storage_format="v3", storage=s)

    try:
        sd = api.storagedomains.add(sd_params)
        print "Storage Domain '%s' added (%s)." % (sd.get_name())
    except Exception as ex:
        print "Adding storage domain failed: %s" % ex

    api.disconnect()

except Exception as ex:
    print "Unexpected error: %s" % ex
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If the add method call is successful then the script will output: 
Storage Domain 'data1' added (bd954c03-d180-4d16-878c-2aedbdede566).
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