These are the common settings we use across all our Django apps, extracted into a handy reusable module.
First, install it with
$ pip install ctlsettings
or add ctlsettings==0.3.3
to your requirements.txt
.
The following libraries are used in some way, so they'll need to be installed:
- django-cas-ng
- django-debug-toolbar
- coverage
- django-smoketest
- django-extensions
- django-statsd-mozilla
- django-storages
- django-impersonate
- boto3
- sentry-sdk
- statsd
- gunicorn
ctlsettings
has three "environments" (for now) that you will want
to make use of: shared
, staging
, and production
.
In your settings_shared.py
you will want to do something like:
import os.path
from ctlsettings.shared import common
project = 'yourapp'
base = os.path.dirname(__file__)
locals().update(common(project=project, base=base))
# which apps should jenkins include in coverage reports?
PROJECT_APPS = [
'yourapp.main',
]
INSTALLED_APPS += [ # noqa
'yourapp.main',
]
Most of the magic is on the locals().update(...)
line. That's where
the common
function from ctlsettings.shared
is called with
simple configuration and returns a bunch of variables, which are then
injected into the local symbol table. The two requires parameters are
project
and base
.
project
is the name of your project. It should be lowercase with
just alphanumeric characters. Most likely, just the name of the
directory for your project.
base
is the full path of the directory that settings_shared.py
is
in.
After that, a few settings that ctlsettings
can't fully set up are
set and/or modified. In particular, the project's apps are added to
INSTALLED_APPS
.
An important note is that because of the weird symbol table tweaking
done earlier, flake8 will complain if you try to modify a variable
that comes out of ctlsettings
, since it didn't see where it got
defined. You need to add the # noqa
line to each variable that you
modify this way to get it to ignore it.
You'll do almost the same thing for your settings_staging.py
and
settings_production.py
:
from myapp.settings_shared import *
from ctlsettings.staging import common
import os
project = 'yourapp'
base = os.path.dirname(__file__)
locals().update(
common(
project=project,
base=base,
STATIC_ROOT=STATIC_ROOT,
INSTALLED_APPS=INSTALLED_APPS,
cloudfront='some-cloudfront-id',
))
try:
from myapp.local_settings import *
except ImportError:
pass
(and the same thing for settings_production.py
, but with from ctlsettings.production import common
instead.)
Again, you are passing in project
, and base
. The
staging/production settings also need to have access to STATIC_ROOT
and INSTALLED_APPS
, so those must be passed in.
Finally, there are a couple variables related to static file deployment that you may or may not want to set:
s3static
is a boolean. It defaults to True
and tells
ctlsettings
that you are using S3 for serving static
files. Mainly, you will want to set this to False
if your
application is not yet serving static files off S3.
cloudfront
is a cloudfront id. If you pass it in, AWS Cloudfront
will be used for the static files URLs.
If you're converting an existing app to ctlsettings
, which I
recommend is:
- install
ctlsettings
and any libraries it requires - add the
ctlsettings
related stuff to the top of yoursettings_shared.py
and set up the basic configuration, but leave all your settings in place after it (effectively overriding everything thatctlsettings
is pulling in). - pull up https://github.com/ccnmtl/ctlsettings/blob/master/ctlsettings/shared.py in a browser.
- line by line, setting by setting, compare what you have in your
settings_shared.py
with whatctlsettings
has for the same variable. Delete yours if they are the same. Otherwise leave yours in place (or append the differences if it's a list variable). - run your tests/flake8 each time.
- do the same for staging/production.