I finally solved a problem.
The correct database configuration in settings.py file is:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'db',
'USER': 'user',
'PASSWORD': 'pass',
'HOST': '192.168.11.11',
'PORT': '3306',
},
'mssql': {
'ATOMIC_REQUESTS': True,
'NAME': 'DB',
'ENGINE': 'django_pyodbc',
'USER': 'admin',
'PASSWORD': 'pass',
'OPTIONS': {
'dsn': 'DBDSN',
'host_is_server': True,
'collation': 'Cyrillic_General_CI_AS',
'driver_supports_utf8': True,
'unicode_results': True,
'autocommit': True,
},
}
}
/etc/freetds/freetds.conf
[global]
tds version = 7.3
text size = 64512
[SRV]
host = mssql.local
port = 1433
/etc/odbc.ini
[ODBC Data Sources]
DBDSN = Microsoft SQL Server
[DBDSN]
Driver = FreeTDS
Servername = SRV
Trace = No
Database = DB
/etc/odbcinst.ini
[FreeTDS]
Description = FreeTDS
Driver = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so
Setup = /usr/lib/x86_64-linux-gnu/odbc/libtdsS.so
UsageCount = 1
The important point is that odbc.ini and odbsinst.ini files should NOT contain spaces or tabs in the begining of the lines.
These settings allows cyrillic symbols to be normally inserted into database.