1:31:21.876 TRACE nova.wsgi LookupError: No section 'ec2' (prefixed by 'app' or 'application' or 'composite' or 'composit' or 'pipeline' or 'filter-app') found in config /etc/nova/api-paste.ini 2016-01-07 11:31:21.876 TRACE nova.wsgi 2016-01-07 11:31:21.877 CRITICAL nova [-] PasteAppNotFound: Could not load paste app 'ec2' from /etc/nova/api-paste.ini

looks like you need to correct your api-paste.ini

Here is an example: [root@platform2 ~]# cat /etc/nova/api-paste.ini

############
# Metadata #
############
[composite:metadata]
use = egg:Paste#urlmap
/: meta

[pipeline:meta]
pipeline = ec2faultwrap logrequest metaapp

[app:metaapp]
paste.app_factory = nova.api.metadata.handler:MetadataRequestHandler.factory

#######
# EC2 #
#######

# NOTE: this is now deprecated in favor of https://github.com/stackforge/ec2-api
[composite:ec2]
use = egg:Paste#urlmap
/: ec2cloud

[composite:ec2cloud]
use = call:nova.api.auth:pipeline_factory
noauth2 = ec2faultwrap logrequest ec2noauth cloudrequest validator ec2executor
keystone = ec2faultwrap logrequest ec2keystoneauth cloudrequest validator ec2executor

[filter:ec2faultwrap]
paste.filter_factory = nova.api.ec2:FaultWrapper.factory

[filter:logrequest]
paste.filter_factory = nova.api.ec2:RequestLogging.factory

[filter:ec2lockout]
paste.filter_factory = nova.api.ec2:Lockout.factory

[filter:ec2keystoneauth]                                                                                                                                     
paste.filter_factory = nova.api.ec2:EC2KeystoneAuth.factory

[filter:ec2noauth]
paste.filter_factory = nova.api.ec2:NoAuth.factory

[filter:cloudrequest]
controller = nova.api.ec2.cloud.CloudController
paste.filter_factory = nova.api.ec2:Requestify.factory

[filter:authorizer]
paste.filter_factory = nova.api.ec2:Authorizer.factory

[filter:validator]
paste.filter_factory = nova.api.ec2:Validator.factory

[app:ec2executor]
paste.app_factory = nova.api.ec2:Executor.factory

#############
# OpenStack #
#############

[composite:osapi_compute]
use = call:nova.api.openstack.urlmap:urlmap_factory
/: oscomputeversions
# starting in Liberty the v21 implementation replaces the v2
# implementation and is suggested that you use it as the default. If
# this causes issues with your clients you can rollback to the
# *frozen* v2 api by commenting out the above stanza and using the
# following instead::
# /v1.1: openstack_compute_api_legacy_v2
# /v2: openstack_compute_api_legacy_v2
# if rolling back to v2 fixes your issue please file a critical bug
# at - https://bugs.launchpad.net/nova/+bugs
#
# v21 is an exactly feature match for v2, except it has more stringent
# input validation on the wsgi surface (prevents fuzzing early on the
# API). It also provides new features via API microversions which are
# opt into for clients. Unaware clients will receive the same frozen
# v2 API feature set, but with some relaxed validation
/v1.1: openstack_compute_api_v21_legacy_v2_compatible
/v2: openstack_compute_api_v21_legacy_v2_compatible
/v2.1: openstack_compute_api_v21

# NOTE: this is deprecated in favor of openstack_compute_api_v21_legacy_v2_compatible
[composite:openstack_compute_api_legacy_v2]
use = call:nova.api.auth:pipeline_factory
noauth2 = compute_req_id faultwrap sizelimit noauth2 legacy_ratelimit osapi_compute_app_legacy_v2
keystone = compute_req_id faultwrap sizelimit authtoken keystonecontext legacy_ratelimit osapi_compute_app_legacy_v2
keystone_nolimit = compute_req_id faultwrap sizelimit authtoken keystonecontext osapi_compute_app_legacy_v2

[composite:openstack_compute_api_v21]
use = call:nova.api.auth:pipeline_factory_v21
noauth2 = compute_req_id faultwrap sizelimit noauth2 osapi_compute_app_v21
keystone = compute_req_id faultwrap sizelimit authtoken keystonecontext osapi_compute_app_v21

[composite:openstack_compute_api_v21_legacy_v2_compatible]
use = call:nova.api.auth:pipeline_factory_v21
noauth2 = compute_req_id faultwrap sizelimit noauth2 legacy_v2_compatible osapi_compute_app_v21
keystone = compute_req_id faultwrap sizelimit authtoken keystonecontext legacy_v2_compatible osapi_compute_app_v21

[filter:request_id]
paste.filter_factory = oslo_middleware:RequestId.factory

[filter:compute_req_id]
paste.filter_factory = nova.api.compute_req_id:ComputeReqIdMiddleware.factory

[filter:faultwrap]
paste.filter_factory = nova.api.openstack:FaultWrapper.factory

[filter:noauth2]
paste.filter_factory = nova.api.openstack.auth:NoAuthMiddleware.factory

[filter:legacy_ratelimit]
paste.filter_factory = nova.api ...