Fix quota calculation for storage test [bug 1715333]

https://bugs.launchpad.net/kloudbuster/+bug/1715333

Only calculate cinder quota for client tenant
use the storage configs vm count and disk size (not the flavor disk size)

Add INFO to display the calculated disk and volume quotas

Only lookup for flavors ond image once at the kloud level (instead of every instance)

Change-Id: Ic92d962d6765e682e3158d7b52d7c7f3310b09bc

.testr.conf

@@ -1,7 +0,0 @@
-[DEFAULT]
-test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
-             OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
-             OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
-             ${PYTHON:-python} -m subunit.run discover -t ./ . $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

LICENSE

@@ -173,4 +173,3 @@
       defend, and hold each Contributor harmless for any liability
       incurred by, or claims asserted against, such Contributor by reason
       of your accepting any such warranty or additional liability.
-

MANIFEST.in

@@ -2,5 +2,4 @@ include AUTHORS
 include ChangeLog
 exclude .gitignore
 exclude .gitreview
-
 global-exclude *.pyc

babel.cfg

@@ -1,2 +1 @@
 [python: **.py]
-

kloudbuster/base_compute.py

@@ -16,6 +16,7 @@ import os
 import time
 
 import log as logging
+from novaclient.exceptions import BadRequest
 
 LOG = logging.getLogger(__name__)
 
@@ -60,15 +61,14 @@ class BaseCompute(object):
         5. Security group instance
         6. Optional parameters: availability zone, user data, config drive
         """
-
+        kloud = self.network.router.user.tenant.kloud
-        # Get the image id and flavor id from their logical names
+        image = kloud.vm_img
-        image = self.find_image(image_name)
+        flavor = kloud.flavors[flavor_type]
-        flavor_type = self.find_flavor(flavor_type)
 
         # Also attach the created security group for the test
         instance = self.novaclient.servers.create(name=self.vm_name,
                                                   image=image,
-                                                  flavor=flavor_type,
+                                                  flavor=flavor,
                                                   key_name=keyname,
                                                   nics=nic,
                                                   availability_zone=avail_zone,
@@ -118,17 +118,12 @@ class BaseCompute(object):
         if self.instance and self.vol:
             attached_vols = self.novaclient.volumes.get_server_volumes(self.instance.id)
             if len(attached_vols):
-                self.novaclient.volumes.delete_server_volume(self.instance.id, self.vol.id)
+                try:
-
+                    self.novaclient.volumes.delete_server_volume(self.instance.id, self.vol.id)
-    def find_image(self, image_name):
+                except BadRequest:
-        """
+                    # WARNING Some resources in client cloud are not cleaned up properly.:
-        Given a image name return the image id
+                    # BadRequest: Invalid volume: Volume must be attached in order to detach
-        """
+                    pass
-        try:
-            image = self.novaclient.glance.find_image(image_name)
-            return image
-        except Exception:
-            return None
 
     def find_flavor(self, flavor_type):
         """
@@ -287,16 +282,21 @@ class Flavor(object):
     def list(self):
         return self.novaclient.flavors.list()
 
-    def create_flavor(self, name, ram, vcpus, disk, ephemeral, override=False):
+    def create_flavor(self, flavor_dict):
-        # Creating flavors
+        '''Delete the old flavor with same name if any and create a new one
-        if override:
-            self.delete_flavor(name)
-        return self.novaclient.flavors.create(name=name, ram=ram, vcpus=vcpus,
-                                              disk=disk, ephemeral=ephemeral)
 
-    def delete_flavor(self, name):
+        flavor_dict: dict with following keys: name, ram, vcpus, disk, ephemeral
+        '''
+        name = flavor_dict['name']
+        flavor = self.get(name)
+        if flavor:
+            LOG.info('Deleting old flavor %s', name)
+            self.delete_flavor(flavor)
+        LOG.info('Creating flavor %s', name)
+        return self.novaclient.flavors.create(**flavor_dict)
+
+    def delete_flavor(self, flavor):
         try:
-            flavor = self.novaclient.flavors.find(name=name)
             flavor.delete()
         except Exception:
             pass

kloudbuster/kb_runner_base.py

@@ -183,7 +183,7 @@ class KBRunner(object):
                 else:
                     LOG.error('[%s] received invalid command: %s' + (vm_name, cmd))
 
-            log_msg = "%d Succeed, %d Failed, %d Pending... Retry #%d" %\
+            log_msg = "VMs: %d Ready, %d Failed, %d Pending... Retry #%d" %\
                       (cnt_succ, cnt_failed, len(clist), retry)
             if sample_count != 0:
                 log_msg += " (%d sample(s) received)" % sample_count

kloudbuster/kloudbuster.py

@@ -56,8 +56,17 @@ LOG = logging.getLogger(__name__)
 class KBVMCreationException(Exception):
     pass
 
+class KBFlavorCheckException(Exception):
+    pass
+
+# flavor names to use
+FLAVOR_KB_PROXY = 'KB.proxy'
+FLAVOR_KB_CLIENT = 'KB.client'
+FLAVOR_KB_SERVER = 'KB.server'
+
 class Kloud(object):
-    def __init__(self, scale_cfg, cred, reusing_tenants,
+
+    def __init__(self, scale_cfg, cred, reusing_tenants, vm_img,
                  testing_side=False, storage_mode=False, multicast_mode=False):
         self.tenant_list = []
         self.testing_side = testing_side
@@ -67,9 +76,9 @@ class Kloud(object):
         self.multicast_mode = multicast_mode
         self.credentials = cred
         self.osclient_session = cred.get_session()
-        self.flavor_to_use = None
         self.vm_up_count = 0
         self.res_logger = KBResLogger()
+        self.vm_img = vm_img
         if testing_side:
             self.prefix = 'KBc'
             self.name = 'Client Kloud'
@@ -92,8 +101,43 @@ class Kloud(object):
         LOG.info("Creating kloud: " + self.prefix)
         if self.placement_az:
             LOG.info('%s Availability Zone: %s' % (self.name, self.placement_az))
+        # A dict of flavors indexed by flavor name
+        self.flavors = {}
+
+    def select_flavor(self):
+        # Select an existing flavor that Flavor check
+        flavor_manager = base_compute.Flavor(self.nova_client)
+        fcand = {'vcpus': sys.maxint, 'ram': sys.maxint, 'disk': sys.maxint}
+        # find the smallest flavor that is at least 1vcpu, 1024MB ram and 10MB disk
+        for flavor in flavor_manager.list():
+            flavor = vars(flavor)
+            if flavor['vcpus'] < 1 or flavor['ram'] < 1024 or flavor['disk'] < 10:
+                continue
+            if flavor['vcpus'] < fcand['vcpus']:
+                fcand = flavor
+            elif flavor['vcpus'] == fcand['vcpus']:
+                if flavor['ram'] < fcand['ram']:
+                    fcand = flavor
+                elif flavor['ram'] == fcand['ram'] and flavor['disk'] < fcand['disk']:
+                    fcand = flavor
+            find_flag = True
+
+        if find_flag:
+            LOG.info('Automatically selecting flavor %s to instantiate VMs.' % fcand['name'])
+            return fcand
+        LOG.error('Cannot find a flavor which meets the minimum '
+                  'requirements to instantiate VMs.')
+        raise KBFlavorCheckException()
 
     def create_resources(self, tenant_quota):
+        def create_flavor(fm, name, flavor_dict, extra_specs):
+            flavor_dict['name'] = name
+            flv = fm.create_flavor(flavor_dict)
+            if extra_specs:
+                flv.set_keys(extra_specs)
+            self.flavors[name] = flv
+            self.res_logger.log('flavors', vars(flv)['name'], vars(flv)['id'])
+
         if self.reusing_tenants:
             for tenant_info in self.reusing_tenants:
                 tenant_name = tenant_info['name']
@@ -112,7 +156,17 @@ class Kloud(object):
         for tenant_instance in self.tenant_list:
             tenant_instance.create_resources()
 
-        if not self.reusing_tenants:
+        # Create/reuse flavors for this cloud
+        if self.reusing_tenants:
+            # If tenants are reused, we do not create new flavors but pick one
+            # existing that is good enough
+            flavor = self.select_flavor()
+            if self.testing_side:
+                self.flavors[FLAVOR_KB_PROXY] = flavor
+                self.flavors[FLAVOR_KB_CLIENT] = flavor
+            else:
+                self.flavors[FLAVOR_KB_SERVER] = flavor
+        else:
             # Create flavors for servers, clients, and kb-proxy nodes
             nova_client = self.tenant_list[0].user_list[0].nova_client
             flavor_manager = base_compute.Flavor(nova_client)
@@ -125,35 +179,29 @@ class Kloud(object):
             else:
                 flavor_dict['ephemeral'] = 0
             if self.testing_side:
-                flv = flavor_manager.create_flavor('KB.proxy', override=True,
+                proxy_flavor = {
-                                                   ram=2048, vcpus=1, disk=0, ephemeral=0)
+                    "vcpus": 1,
-                self.res_logger.log('flavors', vars(flv)['name'], vars(flv)['id'])
+                    "ram": 2048,
-                flv = flavor_manager.create_flavor('KB.client', override=True, **flavor_dict)
+                    "disk": 0,
-                self.res_logger.log('flavors', vars(flv)['name'], vars(flv)['id'])
+                    "ephemeral": 0
+                }
+                create_flavor(flavor_manager, FLAVOR_KB_PROXY, proxy_flavor, extra_specs)
+                create_flavor(flavor_manager, FLAVOR_KB_CLIENT, flavor_dict, extra_specs)
             else:
-                flv = flavor_manager.create_flavor('KB.server', override=True, **flavor_dict)
+                create_flavor(flavor_manager, FLAVOR_KB_SERVER, flavor_dict, extra_specs)
-                self.res_logger.log('flavors', vars(flv)['name'], vars(flv)['id'])
-            if extra_specs:
-                flv.set_keys(extra_specs)
 
 
     def delete_resources(self):
-        # Deleting flavors created by KloudBuster
+
-        try:
+        if not self.reusing_tenants:
-            nova_client = self.tenant_list[0].user_list[0].nova_client
+            for fn, flavor in self.flavors.iteritems():
-        except Exception:
+                LOG.info('Deleting flavor %s', fn)
-            # NOVA Client is not yet initialized, so skip cleaning up...
+                try:
-            return True
+                    flavor.delete()
+                except Exception as exc:
+                    LOG.warning('Error deleting flavor %s: %s', fn, str(exc))
 
         flag = True
-        if not self.reusing_tenants:
-            flavor_manager = base_compute.Flavor(nova_client)
-            if self.testing_side:
-                flavor_manager.delete_flavor('KB.client')
-                flavor_manager.delete_flavor('KB.proxy')
-            else:
-                flavor_manager.delete_flavor('KB.server')
-
         for tnt in self.tenant_list:
             flag = flag & tnt.delete_resources()
 
@@ -256,7 +304,6 @@ class KloudBuster(object):
         self.storage_mode = storage_mode
         self.multicast_mode = multicast_mode
 
-
         if topology and tenants_list:
             self.topology = None
             LOG.warning("REUSING MODE: Topology configs will be ignored.")
@@ -289,6 +336,8 @@ class KloudBuster(object):
         self.fp_logfile = None
         self.kloud = None
         self.testing_kloud = None
+        self.server_vm_img = None
+        self.client_vm_img = None
 
     def get_hypervisor_list(self, cred):
         ret_list = []
@@ -314,64 +363,79 @@ class KloudBuster(object):
 
         return ret_list
 
-    def check_and_upload_images(self, retry_count=150):
+    def check_and_upload_image(self, kloud_name, image_name, image_url, sess, retry_count):
+        '''Check a VM image and upload it if not found
+        '''
+        glance_client = glanceclient.Client('2', session=sess)
+        try:
+            # Search for the image
+            img = glance_client.images.list(filters={'name': image_name}).next()
+            # image found
+            return img
+        except StopIteration:
+            sys.exc_clear()
+
+        # Trying to upload image
+        LOG.info("KloudBuster VM Image is not found in %s, trying to upload it..." % kloud_name)
+        if not image_url:
+            LOG.error('Configuration file is missing a VM image pathname (vm_image_name)')
+            return None
         retry = 0
+        try:
+            LOG.info("Uploading VM Image from %s..." % image_url)
+            with open(image_url) as f_image:
+                img = glance_client.images.create(name=image_name,
+                                                  disk_format="qcow2",
+                                                  container_format="bare",
+                                                  visibility="public")
+                glance_client.images.upload(img.id, image_data=f_image)
+            # Check for the image in glance
+            while img.status in ['queued', 'saving'] and retry < retry_count:
+                img = glance_client.images.get(img.id)
+                retry += 1
+                LOG.debug("Image not yet active, retrying %s of %s...", retry, retry_count)
+                time.sleep(2)
+            if img.status != 'active':
+                LOG.error("Image uploaded but too long to get to active state")
+                raise Exception("Image update active state timeout")
+        except glance_exception.HTTPForbidden:
+            LOG.error("Cannot upload image without admin access. Please make "
+                      "sure the image is uploaded and is either public or owned by you.")
+            return None
+        except IOError as exc:
+            # catch the exception for file based errors.
+            LOG.error("Failed while uploading the image. Please make sure the "
+                      "image at the specified location %s is correct: %s",
+                      image_url, str(exc))
+            return None
+        except keystoneauth1.exceptions.http.NotFound as exc:
+            LOG.error("Authentication error while uploading the image: " + str(exc))
+            return None
+        except Exception:
+            LOG.error(traceback.format_exc())
+            LOG.error("Failed while uploading the image: %s", str(exc))
+            return None
+        return img
+
+    def check_and_upload_images(self, retry_count=150):
         image_name = self.client_cfg.image_name
         image_url = self.client_cfg.vm_image_file
-        kloud_name_list = ['Server kloud', 'Client kloud']
+        self.server_vm_img = self.check_and_upload_image('Server kloud',
-        session_list = [self.server_cred.get_session(),
+                                                         image_name,
-                        self.client_cred.get_session()]
+                                                         image_url,
-        for kloud, sess in zip(kloud_name_list, session_list):
+                                                         self.server_cred.get_session(),
-            glance_client = glanceclient.Client('2', session=sess)
+                                                         retry_count)
-            try:
+        if self.server_vm_img is None:
-                # Search for the image
+            return False
-                img = glance_client.images.list(filters={'name': image_name}).next()
+        if self.client_cred == self.server_cred:
-                continue
+            self.client_vm_img = self.server_vm_img
-            except StopIteration:
+        else:
-                sys.exc_clear()
+            self.client_vm_img = self.check_and_upload_image('Client kloud',
-
+                                                             image_name,
-            # Trying to upload images
+                                                             image_url,
-            LOG.info("KloudBuster VM Image is not found in %s, trying to upload it..." % kloud)
+                                                             self.client_cred.get_session(),
-            if not image_url:
+                                                             retry_count)
-                LOG.error('Configuration file is missing a VM image pathname (vm_image_name)')
+        return self.client_vm_img is not None
-                return False
-            retry = 0
-            try:
-                LOG.info("Uploading VM Image from %s..." % image_url)
-                with open(image_url) as f_image:
-                    img = glance_client.images.create(name=image_name,
-                                                      disk_format="qcow2",
-                                                      container_format="bare",
-                                                      visibility="public")
-                    glance_client.images.upload(img.id, image_data=f_image)
-                # Check for the image in glance
-                while img.status in ['queued', 'saving'] and retry < retry_count:
-                    img = glance_client.images.get(img.id)
-                    retry += 1
-                    LOG.debug("Image not yet active, retrying %s of %s...", retry, retry_count)
-                    time.sleep(2)
-                if img.status != 'active':
-                    LOG.error("Image uploaded but too long to get to active state")
-                    raise Exception("Image update active state timeout")
-            except glance_exception.HTTPForbidden:
-                LOG.error("Cannot upload image without admin access. Please make "
-                          "sure the image is uploaded and is either public or owned by you.")
-                return False
-            except IOError as exc:
-                # catch the exception for file based errors.
-                LOG.error("Failed while uploading the image. Please make sure the "
-                          "image at the specified location %s is correct: %s",
-                          image_url, str(exc))
-                return False
-            except keystoneauth1.exceptions.http.NotFound as exc:
-                LOG.error("Authentication error while uploading the image: " + str(exc))
-                return False
-            except Exception:
-                LOG.error(traceback.format_exc())
-                LOG.error("Failed while uploading the image: %s", str(exc))
-                return False
-            return True
-        return True
 
     def print_provision_info(self):
         """
@@ -408,8 +472,7 @@ class KloudBuster(object):
             for ins in server_list:
                 ins.user_data['role'] = 'HTTP_Server'
                 ins.user_data['http_server_configs'] = ins.config['http_server_configs']
-                ins.boot_info['flavor_type'] = 'KB.server' if \
+                ins.boot_info['flavor_type'] = FLAVOR_KB_SERVER
-                    not self.tenants_list['server'] else self.kloud.flavor_to_use
                 ins.boot_info['user_data'] = str(ins.user_data)
         elif test_mode == 'multicast':
             # Nuttcp tests over first /25
@@ -433,8 +496,7 @@ class KloudBuster(object):
                 ins.user_data['multicast_listener_address_start'] = listener_addr_start
                 ins.user_data['ntp_clocks'] = clocks
                 ins.user_data['pktsizes'] = self.client_cfg.multicast_tool_configs.pktsizes
-                ins.boot_info['flavor_type'] = 'KB.server' if \
+                ins.boot_info['flavor_type'] = FLAVOR_KB_SERVER
-                    not self.tenants_list['server'] else self.kloud.flavor_to_use
                 ins.boot_info['user_data'] = str(ins.user_data)
 
     def gen_client_user_data(self, test_mode):
@@ -457,8 +519,7 @@ class KloudBuster(object):
                 ins.user_data['target_shared_interface_ip'] = server_list[idx].shared_interface_ip
                 if role == 'Multicast_Client':
                     ins.user_data['ntp_clocks'] = clocks
-                ins.boot_info['flavor_type'] = 'KB.client' if \
+                ins.boot_info['flavor_type'] = FLAVOR_KB_CLIENT
-                    not self.tenants_list['client'] else self.testing_kloud.flavor_to_use
                 ins.boot_info['user_data'] = str(ins.user_data)
         else:
             for idx, ins in enumerate(client_list):
@@ -466,8 +527,7 @@ class KloudBuster(object):
                 ins.user_data['vm_name'] = ins.vm_name
                 ins.user_data['redis_server'] = self.kb_proxy.fixed_ip
                 ins.user_data['redis_server_port'] = 6379
-                ins.boot_info['flavor_type'] = 'KB.client' if \
+                ins.boot_info['flavor_type'] = FLAVOR_KB_CLIENT
-                    not self.tenants_list['client'] else self.testing_kloud.flavor_to_use
                 ins.boot_info['user_data'] = str(ins.user_data)
 
     def gen_metadata(self):
@@ -505,12 +565,15 @@ class KloudBuster(object):
         tenant_quota = self.calc_tenant_quota()
         if not self.storage_mode:
             self.kloud = Kloud(self.server_cfg, self.server_cred, self.tenants_list['server'],
+                               self.server_vm_img,
                                storage_mode=self.storage_mode, multicast_mode=self.multicast_mode)
             self.server_vm_create_thread = threading.Thread(target=self.kloud.create_vms,
                                                             args=[vm_creation_concurrency])
             self.server_vm_create_thread.daemon = True
         self.testing_kloud = Kloud(self.client_cfg, self.client_cred,
-                                   self.tenants_list['client'], testing_side=True,
+                                   self.tenants_list['client'],
+                                   self.client_vm_img,
+                                   testing_side=True,
                                    storage_mode=self.storage_mode,
                                    multicast_mode=self.multicast_mode)
         self.client_vm_create_thread = threading.Thread(target=self.testing_kloud.create_vms,
@@ -528,8 +591,7 @@ class KloudBuster(object):
 
         self.kb_proxy.vm_name = 'KB-PROXY'
         self.kb_proxy.user_data['role'] = 'KB-PROXY'
-        self.kb_proxy.boot_info['flavor_type'] = 'KB.proxy' if \
+        self.kb_proxy.boot_info['flavor_type'] = FLAVOR_KB_PROXY
-            not self.tenants_list['client'] else self.testing_kloud.flavor_to_use
         if self.topology:
             proxy_hyper = self.topology.clients_rack[0]
             self.kb_proxy.boot_info['avail_zone'] = \
@@ -661,6 +723,7 @@ class KloudBuster(object):
         self.fp_logfile = None
 
     def get_tenant_vm_count(self, config):
+        # this does not apply for storage mode!
         return (config['routers_per_tenant'] * config['networks_per_router'] *
                 config['vms_per_network'])
 
@@ -721,35 +784,50 @@ class KloudBuster(object):
         return [server_quota, client_quota]
 
     def calc_nova_quota(self):
-        total_vm = self.get_tenant_vm_count(self.server_cfg)
         server_quota = {}
-        server_quota['instances'] = total_vm
-        server_quota['cores'] = total_vm * self.server_cfg['flavor']['vcpus']
-        server_quota['ram'] = total_vm * self.server_cfg['flavor']['ram']
-
         client_quota = {}
-        total_vm = self.get_tenant_vm_count(self.client_cfg)
+        if self.storage_mode:
+            # in case of storage, the number of VMs is to be taken from the
+            # the storage config
+            total_vm = self.client_cfg['storage_stage_configs']['vm_count']
+        else:
+            total_vm = self.get_tenant_vm_count(self.server_cfg)
+            server_quota['instances'] = total_vm
+            server_quota['cores'] = total_vm * self.server_cfg['flavor']['vcpus']
+            server_quota['ram'] = total_vm * self.server_cfg['flavor']['ram']
+            LOG.info('Server tenant Nova quotas: instances=%d vcpus=%d ram=%dMB',
+                     server_quota['instances'],
+                     server_quota['cores'],
+                     server_quota['ram'])
+            total_vm = self.get_tenant_vm_count(self.client_cfg)
+
+        # add 1 for the proxy
         client_quota['instances'] = total_vm + 1
         client_quota['cores'] = total_vm * self.client_cfg['flavor']['vcpus'] + 1
         client_quota['ram'] = total_vm * self.client_cfg['flavor']['ram'] + 2048
-
+        LOG.info('Client tenant Nova quotas: instances=%d vcpus=%d ram=%dMB',
+                 client_quota['instances'],
+                 client_quota['cores'],
+                 client_quota['ram'])
         return [server_quota, client_quota]
 
     def calc_cinder_quota(self):
-        total_vm = self.get_tenant_vm_count(self.server_cfg)
+        # Cinder quotas are only set for storage mode
-        svr_disk = self.server_cfg['flavor']['disk']
+        # Since storage mode only uses client tenant
+        # Server tenant cinder quota is only used for non-storage case
+        # we can leave the server quota empty
         server_quota = {}
-        server_quota['gigabytes'] = total_vm * svr_disk \
-            if svr_disk != 0 else -1
-        server_quota['volumes'] = total_vm
 
-        total_vm = self.get_tenant_vm_count(self.client_cfg)
+        # Client tenant quota is based on the number of
-        clt_disk = self.client_cfg['flavor']['disk']
+        # storage VMs and disk size per VM
+        # (note this is not the flavor disk size!)
         client_quota = {}
-        client_quota['gigabytes'] = total_vm * clt_disk + 20 \
+        if self.storage_mode:
-            if clt_disk != 0 else -1
+            storage_cfg = self.client_cfg['storage_stage_configs']
-        client_quota['volumes'] = total_vm
+            vm_count = storage_cfg['vm_count']
-
+            client_quota['gigabytes'] = vm_count * storage_cfg['disk_size']
+            client_quota['volumes'] = vm_count
+            LOG.info('Cinder quotas: volumes=%d storage=%dGB', vm_count, client_quota['gigabytes'])
         return [server_quota, client_quota]
 
     def calc_tenant_quota(self):

kloudbuster/tenant.py

@@ -18,14 +18,10 @@ import base_storage
 
 from keystoneclient import exceptions as keystone_exception
 import log as logging
-import sys
 import users
 
 LOG = logging.getLogger(__name__)
 
-class KBFlavorCheckException(Exception):
-    pass
-
 class KBQuotaCheckException(Exception):
     pass
 
@@ -99,30 +95,6 @@ class Tenant(object):
         neutron_quota.update_quota(self.tenant_quota['neutron'])
 
     def check_quota(self):
-        # Flavor check
-        flavor_manager = base_compute.Flavor(self.kloud.nova_client)
-        find_flag = False
-        fcand = {'vcpus': sys.maxint, 'ram': sys.maxint, 'disk': sys.maxint}
-        for flavor in flavor_manager.list():
-            flavor = vars(flavor)
-            if flavor['vcpus'] < 1 or flavor['ram'] < 1024 or flavor['disk'] < 10:
-                continue
-            if flavor['vcpus'] < fcand['vcpus']:
-                fcand = flavor
-            if flavor['vcpus'] == fcand['vcpus'] and flavor['ram'] < fcand['ram']:
-                fcand = flavor
-            if flavor['vcpus'] == fcand['vcpus'] and flavor['ram'] == fcand['ram'] and\
-               flavor['disk'] < fcand['disk']:
-                fcand = flavor
-            find_flag = True
-
-        if find_flag:
-            LOG.info('Automatically selects flavor %s to instantiate VMs.' % fcand['name'])
-            self.kloud.flavor_to_use = fcand['name']
-        else:
-            LOG.error('Cannot find a flavor which meets the minimum '
-                      'requirements to instantiate VMs.')
-            raise KBFlavorCheckException()
 
         # Nova/Cinder/Neutron quota check
         tenant_id = self.tenant_id