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[Bug 1407618] [NEW] unable to reload allocations neutron-dhcp-agent

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Public bug reported:

In some cases dhcp agent dumps an exception because it's trying to use replace_file over a directory
which was never created.

http://logstash.openstack.org/#eyJzZWFyY2giOiJcIlVuYWJsZSB0byByZWxvYWRfYWxsb2NhdGlvbnMgZGhjcCBmb3JcIiIsImZpZWxkcyI6WyJsb2dfdXJsIl0sIm9mZnNldCI6MCwidGltZWZyYW1lIjoiNjA0ODAwIiwiZ3JhcGhtb2RlIjoiY291bnQiLCJ0aW1lIjp7InVzZXJfaW50ZXJ2YWwiOjB9LCJzdGFtcCI6MTQyMDQ1MDU0OTY2M30=

[req-84e8f66a-5401-424c-82d5-068267d81c7b None] Unable to reload_allocations dhcp for c2a866cf-a1db-4e50-9fc8-5da8b7320669.
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent Traceback (most recent call last):
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/opt/stack/new/neutron/neutron/agent/dhcp_agent.py", line 129, in call_driver
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     getattr(driver, action)(**action_kwargs)
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 445, in reload_allocations
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     self._output_hosts_file()
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 525, in _output_hosts_file
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     utils.replace_file(filename, buf.getvalue())
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/opt/stack/new/neutron/neutron/agent/linux/utils.py", line 112, in replace_file
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     tmp_file = tempfile.NamedTemporaryFile('w+', dir=base_dir, delete=False)
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.7/tempfile.py", line 462, in NamedTemporaryFile
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.7/tempfile.py", line 239, in _mkstemp_inner
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     fd = _os.open(file, flags, 0600)
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/usr/local/lib/python2.7/dist-packages/eventlet/green/os.py", line 109, in open
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     fd = __original_open__(file, flags, mode)
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent OSError: [Errno 2] No such file or directory: '/opt/stack/data/neutron/dhcp/c2a866cf-a1db-4e50-9fc8-5da8b7320669/tmpJnpUfM'
2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent

Proper directory creation must always happen before any attempt to
"replace_file"

** Affects: neutron
     Importance: Undecided
     Assignee: Miguel Angel Ajo (mangelajo)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Miguel Angel Ajo (mangelajo)

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https://bugs.launchpad.net/bugs/1407618

Title:
  unable to reload allocations neutron-dhcp-agent

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  In some cases dhcp agent dumps an exception because it's trying to use replace_file over a directory
  which was never created.

  http://logstash.openstack.org/#eyJzZWFyY2giOiJcIlVuYWJsZSB0byByZWxvYWRfYWxsb2NhdGlvbnMgZGhjcCBmb3JcIiIsImZpZWxkcyI6WyJsb2dfdXJsIl0sIm9mZnNldCI6MCwidGltZWZyYW1lIjoiNjA0ODAwIiwiZ3JhcGhtb2RlIjoiY291bnQiLCJ0aW1lIjp7InVzZXJfaW50ZXJ2YWwiOjB9LCJzdGFtcCI6MTQyMDQ1MDU0OTY2M30=

  [req-84e8f66a-5401-424c-82d5-068267d81c7b None] Unable to reload_allocations dhcp for c2a866cf-a1db-4e50-9fc8-5da8b7320669.
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent Traceback (most recent call last):
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/opt/stack/new/neutron/neutron/agent/dhcp_agent.py", line 129, in call_driver
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     getattr(driver, action)(**action_kwargs)
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 445, in reload_allocations
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     self._output_hosts_file()
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 525, in _output_hosts_file
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     utils.replace_file(filename, buf.getvalue())
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/opt/stack/new/neutron/neutron/agent/linux/utils.py", line 112, in replace_file
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     tmp_file = tempfile.NamedTemporaryFile('w+', dir=base_dir, delete=False)
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.7/tempfile.py", line 462, in NamedTemporaryFile
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.7/tempfile.py", line 239, in _mkstemp_inner
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     fd = _os.open(file, flags, 0600)
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent   File "/usr/local/lib/python2.7/dist-packages/eventlet/green/os.py", line 109, in open
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent     fd = __original_open__(file, flags, mode)
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent OSError: [Errno 2] No such file or directory: '/opt/stack/data/neutron/dhcp/c2a866cf-a1db-4e50-9fc8-5da8b7320669/tmpJnpUfM'
  2015-01-05 09:06:38.554 2489 TRACE neutron.agent.dhcp_agent

  Proper directory creation must always happen before any attempt to
  "replace_file"

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