How to add another database server node in Django - django

Question

I've a 2 databases which I've been running on a single machine. my question is how how can I add More database server along with that I wanna use django sharding so how can I shard my data from both database according to users means user 1 data from db1 and db2 on 1st server user 2's data on another

Answer 1

You need to define a router in settings:
DATABASE_ROUTERS = ['routers.routers.ModelDatabaseRouter']
in routers create file routers:
class ModelDatabaseRouter(object):
"""Allows each model to set its own destiny"""
def db_for_read(self, model, **hints):
# Specify target database with field in_db in model's Meta class
if hasattr(model._meta, 'in_db'):
return model._meta.in_db
return None
def db_for_write(self, model, **hints):
# Specify target database with field in_db in model's Meta class
if hasattr(model._meta, 'in_db'):
return model._meta.in_db
return None
def allow_syncdb(self, db, model):
# Specify target database with field in_db in model's Meta class
if hasattr(model._meta, 'in_db'):
if model._meta.in_db == db:
return True
else:
return False
else:
# Random models that don't specify a database can only go to 'default'
if db == 'default':
return True
else:
return False
(from ) https://djangosnippets.org/snippets/2687/
Now you can define the DB in your models like this:
class YourClass(models.Model):
name = models.CharField(primary_key=True, max_length=50)
creation_time = models.DateTimeField()
class Meta:
in_db = 'api' <-- THIS
The db must be defined in settings:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'XXXXX',
'USER': 'XXXXX',
'PASSWORD': 'XXXXXX',
'HOST': '127.0.0.1',
'PORT': '3306',
},
'api': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'xxxx',
'USER': 'xxxx',
'PASSWORD': 'xxxxxx',
'HOST': '127.0.0.1',
'PORT': '3306',
}
}