I put a Django app on Heroku recently. The home page looks fine, but when I try to go to a page that involves making a query (e.g. p = Photo.objects.get(title=title)), I get this error:
could not connect to server: Connection refused
Is the server running on host "localhost" and accepting
TCP/IP connections on port 5432?
In accordance with this answer, I did $ heroku pg:promote HEROKU_POSTGRESQL_GREEN_URL
Then in my settings.py:
DATABASES = {'default': dj_database_url.config(default=os.environ['DATABASE_URL'])}
Still got the same error, so I tried looking at the results of this (as this answer suggests):
$ heroku run python manage.py shell
>>> from django.conf import settings
>>> print settings.DATABASES['default']
{'TIME_ZONE': 'UTC', 'TEST_MIRROR': None, 'NAME': 'snorthway', 'OPTIONS': {},
'HOST': 'localhost', 'TEST_NAME': None, 'PASSWORD': '******', 'ENGINE':
'django.db.backends.postgresql_psycopg2', 'PORT': '', 'USER': 'snorthway',
'TEST_COLLATION': None, 'TEST_CHARSET': None}
At which point I realized I don't know what I should even be looking for in that. I still don't understand what the error means, so I am unsure how to go about debugging it.
You have not configured your django database correctly in settings.py. It thinks your database is on localhost. Sounds like you have a heroku postgres database so your host should be something like:
df3-64-304-50-250.compute-1.amazonaws.com
Heroku exposes a special database URL through an environment variable called:
DATABASE_URL
There is a very cool python package here called dj_database_url: https://github.com/kennethreitz/dj-database-url it converts that environment variable to what django expects.
you can install it with:
$pip install dj-database-url
I use the following in my settings.py
import dj_database_url
DATABASES = {
'default': dj_database_url.config()
}
Related
I am trying to create tables for my models in this full stack project (Django/React). After I run the python manage.py migrate command I'm expecting to see:
Migrations for X:
X\migrations\0001_initial_py
- Create model Departments
- Create model Employees
Instead I get the following error: (9000, "Client with IP address 'X' is not allowed to connect to this MySQL server."
I have tried the command pip install pymysql
then edited the settings.py file adding
import pymysql
pymysql.install_as_MySQLdb()
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'mytestdb',
'USER': 'testadmin#mytestmysql',
'PASSWORD': 'XXXXXXXXXX#',
'HOST': 'mytestmysql.mysql.database.XXXXXXXXXXXXX.com',
'PORT': '3306'
MySQL permissions are such that you have to specify 'user'#'host' when defining privileges. My guess is that you didn't set the MySQL database user up correctly.
Read here to understand what I'm referring to.
Well, I had one setting file before and it was working perfectly both in local and AWS of course with both the database configuration in one setting file. When ever I use to push my code on AWS I would comment my local db configuration and then push. So for sure, that's annoying. I can't comment and uncomment constantly both the database configuration in one file.
Therefore, I decided to have 2 setting files. one for the local and the other for AWS.
Once I pulled the code into AWS server and run migrations
python manage.py migrate --settings=settings.staging
It worked and migrated. By the way, this is the setting file which resides my RDS configuration. Now the moment I hit the endpoints via postmant the output is as
OperationalError at /account/v1/login
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
means it is still reading the default settings file. How come I make the server run this particular staging setting file. Do I have to declare it on nginx, supervisor or gunicorn?
I'm using these 3 services as well.
Below is my settings file for staging.
from .base import *
# --------------- AWS RDS ---------------
DATABASES = {
'default': {
# 'ENGINE': 'django.db.backends.sqlite3',
# 'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'db name here',
'HOST': 'RDS host here',
'USER': 'postgres',
'PASSWORD': 'pass here',
'PORT': '5432'
}
}
This is my complete staging.py file. which only have this while the rest of the setting is being imported from base.py which is a default setting file. Also it has the local settings.
Any recommendations?
This is also what I've tried.
import socket
hostname = socket.gethostname()
if hostname == "staging":
from settings.staging import *
Thank you
The way I solved this issue is using hostnames. We have 1 settings file with all the default settings. We then import specific files depending on the hostname. Of course you could also use things like IAM-instance roles or something.
We would have this in the default settings file:
import socket
DATABASE = {'default': {'ENGINE': 'django.db.backends.sqlite3', ...}}
hostname = socket.gethostname()
if hostname == "staging-blabla"
from staging import *
staging.py would contain the following:
DATABASE = {'default': {'ENGINE': 'django.db.backends.postgresql_psycopg2', ...}}
I know this question has been asked before, but none of them worked for me so far, so I'm going to give it a chance here.
I'm trying to use MySQL as my database in django, but when I modify the settings.py and run the command:
django-admin dbshell
I get the following error:
django.core.exceptions.ImproperlyConfigured: Requested setting DATABASES,
but settings are not configured. You must either define the environment
variable DJANGO_SETTINGS_MODULE or call settings.configure()
before accessing settings.
What I did:
- I'm running windows 10.
using pipenv, I create fresh virtual environment.
install django.
start new project.
edit the settings.py
in the settings.py I change the DATABASES to the following:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'test_db',
'USER': 'root',
'PASSWORD': '****',
'HOST': '127.0.0.1',
'PORT': '3306',
}
}
also pip installed mysqlclient
Weird thing is that when I make migrations, new tables are created, which means that DB works. why doesn't the command
django-admin dbshell
work?
based on django docs, manage.py does same thing as django-admin, and also adds settings to the sys path, therefore manage.py should be used instead of django-admin
https://docs.djangoproject.com/en/2.1/ref/django-admin/
I am following the django instruction to learn django in eclipse.
I came to the part of running cmd
python manage.py migrate
and it complains about unknown command migrate.
Googled. Knew that it requires South module to be included. I downloaded/installed south, and added 'south' in the INSTALLED_APPS.
I ran the command again, this time it complains
import MySQLdb as Database
ImportError: No module named 'MySQLdb'
So I looked for MySQLdb, only to find that there is none for python 3.
I could not find anything useful. So what do you do to make django to work with mysql?
I know there're other connectors around, but I am trying to follow the django tutorial and it seems that 'migrate' cmd must use 'south' and 'south' must use MySQLdb(?)
--- update ---
Here is the DB settings in settings.py:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'test',
'USER': 'root',
'PASSWORD': '******',
'HOST': '127.0.0.1',
'PORT': '3306',
}
}
I suspect 'ENGINE' has to be something else, but I failed to find enough information online to figure it out...
You can switch to any database you want MySQL or postgresql or sqlite etc for your django app. South uses the default database engine from your django setting DATABASES. As stated here
South automatically exposes the correct set of database API operations
as south.db.db; it detects which database backend you’re using from
your Django settings file.
I'm trying to get my local dev django app to work after following these instructions on adding env database settings.
https://devcenter.heroku.com/articles/django-injection
I followed the instructions but get the following error when my app tries to access the local database
Request Method: GET
Request URL: http://localhost:8000
Django Version: 1.4
Exception Type: ImproperlyConfigured
Exception Value:
You need to specify NAME in your Django settings file.
My database settings originally,
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'db', # Or path to database file if using sqlite3.
'USER': 'foo', # Not used with sqlite3.
'PASSWORD': 'bar', # Not used with sqlite3.
'HOST': 'localhost',
'PORT': '5432',
}
}
the heroku article says to add the following to the settings file
import dj_database_url
DATABASES = {'default': dj_database_url.config(default='postgres://localhost')}
how do I get dj_database_url.config to use my my dev settings when the DATABASE_URL is not available in dev?
You can just add your dev settings to the default values like this...
import dj_database_url
DATABASES = {'default': dj_database_url.config(default='postgres://foo:bar#localhost:5432/db')}
Use this in your settings.py:
DATABASES = {'default': dj_database_url.config(default=os.environ['DATABASE_URL'])}
and in your .env file have this:
DATABASE_URL=postgres://localhost/yourdbname
when you launch with "foreman start" it will look at the .env file and create all those environment variables, just like running on Heroku itself. Type "heroku config" to confirm that you have a DATABASE_URL set, which you should if you added the postgres database addon.
Just set an environment variable on your operating system and check weither or not it's set. For instance, with a UNIX system:
# In ~/.bash_profile
export LOCAL_DEV=true
# In settings.py
import dj_database_url
DATABASES = {'default': dj_database_url.config(default='postgres://localhost')}
if bool(os.environ.get('LOCAL_DEV', False)):
# Override DATABASES['default'] with your local database configuration
Also, if you need to set an environment variable on your heroku space:
heroku config:add MY_VAR='my_value'
I just tried this and here is my code:
import dj_database_url
local_db = 'postgres://django_login:123456#localhost/django_db'
DATABASES = {'default': dj_database_url.config(default=local_db)}
My database name is "django_db", user name is "django_login", password is "123456".
My code can run both in local machine and heroku.
import dj_database_url
DATABASES = {'default':
dj_database_url.config(default='postgres://yourusername:yourpassword#yourhosturl:5432/yourdbname')}
** Replace bold string with your database settings
if you are using local database then replace yourhosturl by localhost