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[Bug 1524205] Re: To set "image_cache_subdirectory_name=_base$my_ip", and create a instance failed.

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Kairat Kushaev <kkushaev@xxxxxxxxxxxx>
Date: Tue, 22 Dec 2015 16:06:50 -0000
Reply-to: Bug 1524205 <1524205@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
AFAIK, glance image cache is transparent to the user: so the user don't know if he is using cache or not.
It also doesn't have any dependencies on nova caching implementation. 
AFAIU caching in nova is managed by Nova so please change affected projects. Please, reopen a bug if there is glance dependencies on it.

** Project changed: glance => nova

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https://bugs.launchpad.net/bugs/1524205

Title:
  To set "image_cache_subdirectory_name=_base$my_ip",  and create a
  instance failed.

Status in OpenStack Compute (nova):
  New

Bug description:
  If I set "mage_cache_subdirectory_name=_base$my_ip" in nova.conf  for
  using glance cache function.  Then I create a instance failed.

  [DEFAULT]
  verbose = True
  dhcpbridge_flagfile=/etc/nova/nova.conf
  dhcpbridge=/usr/bin/nova-dhcpbridge
  logdir=/var/log/nova
  state_path=/var/lib/nova
  lock_path=/var/lock/nova
  force_dhcp_release=True
  libvirt_use_virtio_for_bridges=True
  verbose=True
  ec2_private_dns_show_ip=True
  api_paste_config=/etc/nova/api-paste.ini
  enabled_apis=ec2,osapi_compute,metadata
  rpc_backend = rabbit
  auth_strategy = keystone
  my_ip = 10.10.10.30
  network_api_class = nova.network.neutronv2.api.API
  security_group_api = neutron
  linuxnet_interface_driver = nova.network.linux_net.LinuxOVSInterfaceDriver
  firewall_driver = nova.virt.firewall.NoopFirewallDriver

  image_cache_subdirectory_name = _base$my_ip
  [oslo_messaging_rabbit]
  rabbit_host = 10.10.10.10
  rabbit_userid = openstack
  rabbit_password = 123qwe

  [keystone_authtoken]
  auth_uri = http://10.10.10.10:5000
  auth_url = http://10.10.10.10:35357
  auth_plugin = password
  project_domain_id = default
  user_domain_id = default
  project_name = service
  username = nova
  password = 123qwe

  [vnc]
  enabled = True
  vncserver_listen = 0.0.0.0
  vncserver_proxyclient_address = 10.10.10.30
  novncproxy_base_url = http://10.10.10.10:6080/vnc_auto.html

  [glance]
  host = 10.10.10.10

  [oslo_concurrency]
  lock_path = /var/lib/nova/tmp

  [neutron]
  url = http://10.10.10.10:9696
  auth_url = http://10.10.10.10:35357
  auth_plugin = password
  project_domain_id = default
  user_domain_id = default
  region_name = RegionOne
  project_name = service
  username = neutron
  password = 123qwe

  [xenserver]
  cache_images = all

  
  I found some error informations in /var/log/nova/nova-compute.log

  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a] Traceback (most recent call last):
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2155, in _build_resources
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     yield resources
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2009, in _build_and_run_instance
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     block_device_info=block_device_info)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2444, in spawn
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     block_device_info=block_device_info)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 4519, in _create_domain_and_network
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     xml, pause=pause, power_on=power_on)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 4449, in _create_domain
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     guest.launch(pause=pause)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/guest.py", line 141, in launch
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     self._encoded_xml, errors='ignore')
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 195, in __exit__
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     six.reraise(self.type_, self.value, self.tb)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/guest.py", line 136, in launch
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     return self._domain.createWithFlags(flags)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 183, in doit
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     result = proxy_call(self._autowrap, f, *args, **kwargs)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 141, in proxy_call
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     rv = execute(f, *args, **kwargs)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 122, in execute
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     six.reraise(c, e, tb)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/eventlet/tpool.py", line 80, in tworker
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     rv = meth(*args, **kwargs)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 896, in createWithFlags
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a]     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
  2015-10-27 10:23:16.719 39365 ERROR nova.compute.manager [instance: 1e208e90-a6cd-415f-be9c-7f7af3cec69a] libvirtError: internal error: process exited while connecting to monitor: 2015-10-27T02:23:16.229430Z qemu-system-x86_64: -drive file=/var/lib/nova/instances/1e208e90-a6cd-415f-be9c-7f7af3cec69a/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: Could not open backing file: Could not open '/var/lib/nova/instances/_base10.10.10.30/cd799cdd4ec3bfd3f43e3a0e995909464d6dcfc2': Permission denied

  I check that the owner of _base$my_ip is not nova,  then get
  permission denied.

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References

[Bug 1524205] [NEW] To set "image_cache_subdirectory_name=_base$my_ip", and create a instance failed.
From: Xiaoyu Wang, 2015-12-09