diff --git a/planetstack/observer/steps/garbage_collector.py b/planetstack/observer/steps/garbage_collector.py
index f03577c..4b6dfaf 100644
--- a/planetstack/observer/steps/garbage_collector.py
+++ b/planetstack/observer/steps/garbage_collector.py
@@ -8,4 +8,198 @@
 
 	def call(self):
 		pass
-        
+
+    def run(self):
+        try:
+            logger.info('gc start')
+            #self.sync_roles()
+            self.gc_tenants()
+            self.gc_users()
+            self.gc_user_tenant_roles()
+            self.gc_slivers()
+            self.gc_sliver_ips()
+            self.gc_external_routes()
+        except:
+            traceback.print_exc() 
+
+    def gc_roles(self):
+        """
+         all role that don't already exist in keystone. Remove keystone roles that
+        don't exist in planetstack
+        """
+        # sync all roles that don't already in keystone  
+        keystone_roles = self.driver.shell.keystone.roles.findall()
+        keystone_role_names = [kr.name for kr in keystone_roles]
+        pending_roles = Role.objects.all()
+        pending_role_names = [r.role_type for r in pending_roles] 
+        # don't delete roles for now 
+        """ 
+        # delete keystone roles that don't exist in planetstack
+        for keystone_role in keystone_roles:
+            if keystone_role.name == 'admin':
+                continue
+            if keystone_role.name not in pending_role_names:
+                try:
+                    self.manager.driver.delete_role({id: keystone_role.id})
+                except:
+                    traceback.print_exc()
+        """
+
+    def gc_tenants(self):
+        """
+        Remove sites and slices that no don't exist in openstack db if they 
+        have an enacted time (enacted != None).
+        """ 
+        # get all sites that where enacted != null. We can assume these sites
+        # have previously been synced and need to be checed for deletion.
+        sites = Site.objects.filter(enacted__isnull=False)
+        site_dict = {}
+        for site in sites:
+            site_dict[site.login_base] = site
+
+        # get all slices that where enacted != null. We can assume these slices
+        # have previously been synced and need to be checed for deletion.
+        slices = Slice.objects.filter(enacted__isnull=False)
+        slice_dict = {}
+        for slice in slices:
+            slice_dict[slice.name] = slice
+
+        # delete keystone tenants that don't have a site record
+        tenants = self.driver.shell.keystone.tenants.findall()
+        system_tenants = ['admin','service']
+        for tenant in tenants:
+            if tenant.name in system_tenants: 
+                continue
+            if tenant.name not in site_dict and tenant.name not in slice_dict:
+                try:
+                    self.driver.delete_tenant(tenant.id)
+                    logger.info("deleted tenant: %s" % (tenant))
+                except:
+                    logger.log_exc("delete tenant failed: %s" % tenant)
+
+
+    def gc_users(self):
+        """
+        Remove users that no don't exist in openstack db if they have an 
+        enacted time (enacted != None).
+        """ 
+        # get all users that where enacted != null. We can assume these users
+        # have previously been synced and need to be checed for deletion.
+        users = User.objects.filter(enacted__isnull=False)
+        user_dict = {}
+        for user in users:
+            user_dict[user.kuser_id] = user
+
+        # delete keystone users that don't have a user record
+        system_users = ['admin', 'nova', 'quantum', 'glance', 'cinder', 'swift', 'service']
+        users = self.driver.shell.keystone.users.findall()
+        for user in users:
+            if user.name in system_users:
+                continue
+            if user.id not in user_dict:
+                try:
+                    #self.manager.driver.delete_user(user.id)
+                    logger.info("deleted user: %s" % user)
+                except:
+                    logger.log_exc("delete user failed: %s" % user)
+                    
+
+    def gc_user_tenant_roles(self):
+        """
+        Remove roles that don't exist in openstack db if they have 
+        an enacted time (enacted != None).
+        """
+        # get all site privileges and slice memberships that have been enacted 
+        user_tenant_roles = defaultdict(list)
+        for site_priv in SitePrivilege.objects.filter(enacted__isnull=False):
+            user_tenant_roles[(site_priv.user.kuser_id, site_priv.site.tenant_id)].append(site_priv.role.role)
+        for slice_memb in SliceMembership.objects.filter(enacted__isnull=False):
+            user_tenant_roles[(slice_memb.user.kuser_id, slice_memb.slice.tenant_id)].append(slice_memb.role.role)  
+ 
+        # Some user tenant role aren't stored in planetstack but they must be preserved. 
+        # Role that fall in this category are
+        # 1. Never remove a user's role that their home site
+        # 2. Never remove a user's role at a slice they've created.
+        # Keep track of all roles that must be preserved.     
+        users = User.objects.all()
+        preserved_roles = {}
+        for user in users:
+            tenant_ids = [s['tenant_id'] for s in user.slices.values()]
+            tenant_ids.append(user.site.tenant_id) 
+            preserved_roles[user.kuser_id] = tenant_ids
+
+ 
+        # begin removing user tenant roles from keystone. This is stored in the 
+        # Metadata table.
+        for metadata in self.driver.shell.keystone_db.get_metadata():
+            # skip admin roles
+            if metadata.user_id == self.manager.driver.admin_user.id:
+                continue
+            # skip preserved tenant ids
+            if metadata.user_id in preserved_roles and \
+               metadata.tenant_id in preserved_roles[metadata.user_id]: 
+                continue           
+            # get roles for user at this tenant
+            user_tenant_role_ids = user_tenant_roles.get((metadata.user_id, metadata.tenant_id), [])
+
+            if user_tenant_role_ids:
+                # The user has roles at the tenant. Check if roles need to 
+                # be updated.
+                user_keystone_role_ids = metadata.data.get('roles', [])
+                for role_id in user_keystone_role_ids:
+                    if role_id not in user_tenant_role_ids: 
+                        user_keystone_role_ids.pop(user_keystone_role_ids.index(role_id))
+            else:
+                # The user has no roles at this tenant. 
+                metadata.data['roles'] = [] 
+            #session.add(metadata)
+            logger.info("pruning metadata for %s at %s" % (metadata.user_id, metadata.tenant_id))
+ 
+    def gc_slivers(self):
+        """
+        Remove slivers that no don't exist in openstack db if they have 
+        an enacted time (enacted != None).
+        """
+        # get all slivers where enacted != null. We can assume these users
+        # have previously been synced and need to be checed for deletion.
+        slivers = Sliver.objects.filter(enacted__isnull=False)
+        sliver_dict = {}
+        for sliver in slivers:
+            sliver_dict[sliver.instance_id] = sliver
+
+        # delete sliver that don't have a sliver record
+        ctx = self.driver.shell.nova_db.ctx 
+        instances = self.driver.shell.nova_db.instance_get_all(ctx)
+        for instance in instances:
+            if instance.uuid not in sliver_dict:
+                try:
+                    # lookup tenant and update context  
+                    tenant = self.driver.shell.keystone.tenants.find(id=instance.project_id)
+                    driver = self.driver.client_driver(tenant=tenant.name) 
+                    driver.destroy_instance(instance.uuid)
+                    logger.info("destroyed sliver: %s" % (instance))
+                except:
+                    logger.log_exc("destroy sliver failed: %s" % instance) 
+                
+
+    def gc_sliver_ips(self):
+        """
+        Update ips that have changed.
+        """
+        # fill in null ip addresses
+        slivers = Sliver.objects.filter(ip=None)
+        for sliver in slivers:
+            # update connection
+            self.manager.init_admin(tenant=sliver.slice.name)
+            servers = self.manager.driver.shell.nova.servers.findall(id=sliver.instance_id)
+            if not servers:
+                continue
+            server = servers[0]
+            ips = server.addresses.get(sliver.slice.name, [])
+            if ips and sliver.ip != ips[0]['addr']:
+                sliver.ip = ips[0]['addr']
+                sliver.save()
+                logger.info("updated sliver ip: %s %s" % (sliver, ips[0]))
+
+    def gc_external_routes(self):
+        pass
diff --git a/planetstack/observer/steps/sync_external_routes.py b/planetstack/observer/steps/sync_external_routes.py
index 6c22c8b..cbaf490 100644
--- a/planetstack/observer/steps/sync_external_routes.py
+++ b/planetstack/observer/steps/sync_external_routes.py
@@ -11,10 +11,10 @@
 		pass
 
 	def call(self):
-		routes = self.manager.driver.get_external_routes()
-		subnets = self.manager.driver.shell.quantum.list_subnets()['subnets']
+		routes = self.driver.get_external_routes()
+		subnets = self.driver.shell.quantum.list_subnets()['subnets']
 		for subnet in subnets:
 			try:
-				self.manager.driver.add_external_route(subnet, routes)
+				self.driver.add_external_route(subnet, routes)
 			except:
 				logger.log_exc("failed to add external route for subnet %s" % subnet)
diff --git a/planetstack/observer/steps/sync_network_slivers.py b/planetstack/observer/steps/sync_network_slivers.py
index 9e24fae..4466174 100644
--- a/planetstack/observer/steps/sync_network_slivers.py
+++ b/planetstack/observer/steps/sync_network_slivers.py
@@ -26,7 +26,7 @@
 		for sliver in slivers:
 			slivers_by_instance_id[sliver.instance_id] = sliver
 
-		ports = self.manager.driver.shell.quantum.list_ports()["ports"]
+		ports = self.driver.shell.quantum.list_ports()["ports"]
 		for port in ports:
 			if port["id"] in networkSlivers_by_port:
 				# we already have it
diff --git a/planetstack/observer/steps/sync_networks.py b/planetstack/observer/steps/sync_networks.py
index e64f0a4..f87d241 100644
--- a/planetstack/observer/steps/sync_networks.py
+++ b/planetstack/observer/steps/sync_networks.py
@@ -38,13 +38,19 @@
 												   end = end)
 				network.subnet = cidr
 				network.subnet_id = subnet['id']
+                # add subnet as interface to slice's router
+                self.driver.add_router_interface(router['id'], subnet['id'])
+                # add external route
+                self.driver.add_external_route(subnet)
 
 	def sync_record(self, site):
 		if network.owner and network.owner.creator:
 				try:
 					# update manager context
-					self.driver.init_caller(network.owner.creator, network.owner.name)
+                    real_driver = self.driver
+                    self.driver = self.driver.client_driver(network.owner.creator, network.owner.name)
 					self.save_network(network)
+                    self.driver = real_driver
 					logger.info("saved network: %s" % (network))
 				except Exception,e:
 					logger.log_exc("save network failed: %s" % network)	
diff --git a/planetstack/observer/steps/sync_sliver_ips.py b/planetstack/observer/steps/sync_sliver_ips.py
index d69fd5d..d231d13 100644
--- a/planetstack/observer/steps/sync_sliver_ips.py
+++ b/planetstack/observer/steps/sync_sliver_ips.py
@@ -12,8 +12,8 @@
 		return slivers
 
 	def sync_record(self, sliver):
-		self.manager.init_admin(tenant=sliver.slice.name)
-		servers = self.manager.driver.shell.nova.servers.findall(id=sliver.instance_id)
+        driver = self.driver.client_driver(tenant=sliver.slice.name)  
+		servers = driver.shell.nova.servers.findall(id=sliver.instance_id)
 		if not servers:
 			return
 		server = servers[0]
diff --git a/planetstack/observer/steps/sync_users.py b/planetstack/observer/steps/sync_users.py
index 3f509ef..aa665be 100644
--- a/planetstack/observer/steps/sync_users.py
+++ b/planetstack/observer/steps/sync_users.py
@@ -28,8 +28,9 @@
 				self.driver.delete_user_role(user.kuser_id, user.site.tenant_id, 'admin')
 
 		if user.public_key:
-			self.init_caller(user, user.site.login_base)
-			self.save_key(user.public_key, user.keyname)
-			self.init_admin()
+            driver = self.driver.client_driver(caller=user, tenant=user.site.login_base) 
+            key_fields =  {'name': user.keyname,
+                           'public_key': user.public_key}
+            driver.create_keypair(**key_fields)
 
 		user.save()