diff --git a/HACKING.rst b/HACKING.rst
new file mode 100644
index 0000000000..9b7659019c
--- /dev/null
+++ b/HACKING.rst
@@ -0,0 +1,27 @@
+Ceilometer Style Commandments
+=============================
+
+- Step 1: Read the OpenStack Style Commandments
+  http://docs.openstack.org/developer/hacking/
+- Step 2: Read on
+
+Ceilometer Specific Commandments
+--------------------------------
+
+- [C301] LOG.warn() is not allowed. Use LOG.warning()
+- [C302] Deprecated library function os.popen()
+
+Creating Unit Tests
+-------------------
+For every new feature, unit tests should be created that both test and
+(implicitly) document the usage of said feature. If submitting a patch for a
+bug that had no unit test, a new passing unit test should be added. If a
+submitted bug fix does have a unit test, be sure to add a new one that fails
+without the patch and passes with the patch.
+
+All unittest classes must ultimately inherit from testtools.TestCase.
+
+All setUp and tearDown methods must upcall using the super() method.
+tearDown methods should be avoided and addCleanup calls should be preferred.
+Never manually create tempfiles. Always use the tempfile fixtures from
+the fixture library to ensure that they are cleaned up.
diff --git a/ceilometer/agent/manager.py b/ceilometer/agent/manager.py
index 779c1a3bb1..762949fa82 100644
--- a/ceilometer/agent/manager.py
+++ b/ceilometer/agent/manager.py
@@ -34,7 +34,7 @@ from stevedore import extension
 
 from ceilometer.agent import plugin_base
 from ceilometer import coordination
-from ceilometer.i18n import _, _LI, _LE, _LW
+from ceilometer.i18n import _, _LE, _LI, _LW
 from ceilometer import keystone_client
 from ceilometer import messaging
 from ceilometer import pipeline
diff --git a/ceilometer/collector.py b/ceilometer/collector.py
index 05b3530572..8f1140f6f5 100644
--- a/ceilometer/collector.py
+++ b/ceilometer/collector.py
@@ -25,8 +25,8 @@ from oslo_utils import netutils
 from oslo_utils import units
 
 from ceilometer import dispatcher
-from ceilometer import messaging
 from ceilometer.i18n import _, _LE
+from ceilometer import messaging
 from ceilometer import utils
 
 OPTS = [
diff --git a/ceilometer/compute/pollsters/memory.py b/ceilometer/compute/pollsters/memory.py
index d920dff8ee..5d6735b6e9 100644
--- a/ceilometer/compute/pollsters/memory.py
+++ b/ceilometer/compute/pollsters/memory.py
@@ -19,7 +19,7 @@ import ceilometer
 from ceilometer.compute import pollsters
 from ceilometer.compute.pollsters import util
 from ceilometer.compute.virt import inspector as virt_inspector
-from ceilometer.i18n import _, _LW, _LE
+from ceilometer.i18n import _, _LE, _LW
 from ceilometer import sample
 
 LOG = log.getLogger(__name__)
diff --git a/ceilometer/hacking/__init__.py b/ceilometer/hacking/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/ceilometer/hacking/checks.py b/ceilometer/hacking/checks.py
new file mode 100644
index 0000000000..9474aa5d92
--- /dev/null
+++ b/ceilometer/hacking/checks.py
@@ -0,0 +1,57 @@
+# Copyright (c) 2016 OpenStack Foundation
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+"""
+Guidelines for writing new hacking checks
+
+ - Use only for Ceilometer specific tests. OpenStack general tests
+   should be submitted to the common 'hacking' module.
+ - Pick numbers in the range X3xx. Find the current test with
+   the highest allocated number and then pick the next value.
+ - Keep the test method code in the source file ordered based
+   on the C3xx value.
+ - List the new rule in the top level HACKING.rst file
+
+"""
+
+
+def no_log_warn(logical_line):
+    """Disallow 'LOG.warn('
+
+    https://bugs.launchpad.net/tempest/+bug/1508442
+
+    C301
+    """
+    if logical_line.startswith('LOG.warn('):
+        yield(0, 'C301 Use LOG.warning() rather than LOG.warn()')
+
+
+def no_os_popen(logical_line):
+    """Disallow 'os.popen('
+
+    Deprecated library function os.popen() Replace it using subprocess
+    https://bugs.launchpad.net/tempest/+bug/1529836
+
+    C302
+    """
+
+    if 'os.popen(' in logical_line:
+        yield(0, 'C302 Deprecated library function os.popen(). '
+                 'Replace it using subprocess module. ')
+
+
+def factory(register):
+    register(no_log_warn)
+    register(no_os_popen)
diff --git a/ceilometer/notification.py b/ceilometer/notification.py
index 908356cdc2..d9e4cafc20 100644
--- a/ceilometer/notification.py
+++ b/ceilometer/notification.py
@@ -24,8 +24,8 @@ from stevedore import extension
 from ceilometer.agent import plugin_base as base
 from ceilometer import coordination
 from ceilometer.event import endpoint as event_endpoint
-from ceilometer.i18n import _, _LI, _LW
 from ceilometer import exchange_control
+from ceilometer.i18n import _, _LI, _LW
 from ceilometer import messaging
 from ceilometer import pipeline
 from ceilometer import service_base
diff --git a/ceilometer/publisher/messaging.py b/ceilometer/publisher/messaging.py
index 31157ab0ff..f1b59a9310 100644
--- a/ceilometer/publisher/messaging.py
+++ b/ceilometer/publisher/messaging.py
@@ -27,7 +27,7 @@ from oslo_utils import excutils
 import six
 import six.moves.urllib.parse as urlparse
 
-from ceilometer.i18n import _, _LI, _LE
+from ceilometer.i18n import _, _LE, _LI
 from ceilometer import messaging
 from ceilometer import publisher
 from ceilometer.publisher import utils
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 3ddfb710bd..1bbdc90db6 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -11,6 +11,7 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+import subprocess
 import sys
 import os
 
@@ -150,8 +151,10 @@ html_theme_options = {
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.
 #html_last_updated_fmt = '%b %d, %Y'
-git_cmd = "git log --pretty=format:'%ad, commit %h' --date=local -n1"
-html_last_updated_fmt = os.popen(git_cmd).read()
+git_cmd = ["git", "log", "--pretty=format:'%ad, commit %h'", "--date=local",
+    "-n1"]
+html_last_updated_fmt = subprocess.Popen(
+    git_cmd, stdout=subprocess.PIPE).communicate()[0]
 
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.
diff --git a/tox.ini b/tox.ini
index 111c57aa3f..e5f1952335 100644
--- a/tox.ini
+++ b/tox.ini
@@ -133,3 +133,4 @@ show-source = True
 [hacking]
 import_exceptions =
     ceilometer.i18n
+local-check-factory = ceilometer.hacking.checks.factory