Connect to SQL Server database from RHEL with Windows Authentication - sql-server

Question

I have been working for two weeks in the installation of Superset (from Airbnb) for data visualization on a virtual RHEL machine and the connection with a SQL Server database. But I still cannot connect to this database because of a problem of driver I guess. I tried many things and I would like to know if you have a solution, about a driver I need, about modifications in my configuration etc...
Someone told me about jTDS driver. Maybe I need something like this but for python. If you have any idea, here is what I already did.
1) I tried to connect to the database from Superset :
SQL Alchemy URI : mssql://user:password#fr0-iacls-190.eu.company.corp:10001/dbname
ERROR : {"error": "Connection failed!\n\n
The error message returned was:\n(pyodbc.Error) ('IM002', '[IM002] [unixODBC][DriverManager]
Data source name not found, and no default driver specidied (0) (SQLDriverConnect)')"}
2) I tried almost the same with mssql+pymssql :
SQL Alchemy URI : mssql+pymssql://user:password#fr0-iacls-190.eu.company.corp:10001/dbname
ERROR:{"error":"Connection failed!\n\n
The error message returned was:\n(pymssql.OperationalError) (18456, 'DB-Lib error message 20018,
severity 14:\\nGeneral SQL Server error: Check messages from the SQL Server\\n
DB-Lib error message 20002, severity 9:\\n Adaptive Server connection failed (fr0-iacls-190.eu.company.corp:10001)\\n')"}
3) I tried to connect to the database from my terminal on virtual RHEL machine :
# tsql -S fr0-iacls-190.eu.company.corp -U user
Password:
locale is "en_US.UTF-8"
locale charset is "UTF-8"
using default charset "UTF-8"
20^C
Here I have a timer that increase the number every second. I stopped the example after 20 seconds.
4) Finally I tried a python script like this one :
import pyodbc
cnxn = pyodbc.connect('DRIVER={SQL Server};SERVER=fr0-iacls-190.eu.company.corp;DATABASE=dbname;UID=;PWD=password')
The empty UID is a tip used in another StackOverflow post.
# python connect.py
Traceback (most recent call last):
File "connect.py", line 2, in <module>
cnxn = pyodbc.connect('DRIVER={SQL Server};SERVER=fr0-iacls-190.eu.company.corp;DATABASE=dbname;UID=;PWD=password')
pyodbc.Error: ('01000', "[01000] [unixODBC][Driver Manager]Can't open lib 'SQL Server' : file not found (0) (SQLDriverConnect)")
To finish, I read about two files, odbc.ini and odbcinst.ini but I don't know if they are in the good directory (/etc). I am not working on root (~) but in in the parent directory of root (cd ~/..)...
Here are the two files if necessary :
odbc.ini
;
; odbc.ini
;
[ODBC Data Sources]
JDBC = Sybase JDBC Server
[JDBC]
Driver = /usr/local/lib/libtdsodbc.so
Description = Sybase JDBC Server
Trace = No
Servername = JDBC
Database = pubs2
UID = guest
[Default]
Driver = /usr/local/lib/libtdsodbc.so
odbcinst.ini
[PostgreSQL]
Description=ODBC for PostgreSQL
Driver=/usr/lib/psqlodbcw.so
Setup=/usr/lib/libodbcpsqlS.so
Driver64=/usr/lib64/psqlodbcw.so
Setup64=/usr/lib64/libodbcpsqlS.so
FileUsage=1
[MySQL]
Description=ODBC for MySQL
Driver=/usr/lib/libmyodbc5.so
Setup=/usr/lib/libodbcmyS.so
Driver64=/usr/lib64/libmyodbc5.so
Setup64=/usr/lib64/libodbcmyS.so
FileUsage=1
[MSSQLTest]
Driver = ODBC Driver 13 for SQL Server
Server = [http:]fr0-iacls-190.eu.company.corp[,10001]
#
# Note:
# Port is not a valid keyword in the ~/.odbc.ini file
# for the Microsoft ODBC driver on Linux
#
[ODBC Driver 13 for SQL Server]
Description=Microsoft ODBC Driver 13 for SQL Server
Driver=/opt/microsoft/msodbcsql/lib64/libmsodbcsql-13.1.so.4.0
UsageCount=1
Many thanks for your time and your help.

Answer 1

A few things to try:
Correct the python connection string:
You have the aliased the MS SQL driver in /etc/odbcinst.ini to [ODBC Driver 13 for SQL Server] therefore in your python code you should be using that, rather than SQL Server:
import pyodbc
cnxn = pyodbc.connect('Driver={ODBC Driver 13 for SQL Server};Server=fr0-iacls-190.eu.company.corp;Port=10001;Database=dbname;UID=user;PWD=password')
replacing user and password with correct credentials.
Use isql to test a connection using odbc.ini:
Generally you use the odbcinst.ini to setup driver configuration, and then odbc.ini for database instances (referencing the drivers), thus a valid entry to your odbc.ini could be:
[friendly_database_name]
Description=A description to help you remember what this connection is for
Server=fr0-iacls-190.eu.company.corp
Port=10001
Database=dbname
UID=user
PWD=password
If you have isql installed (comes as part of the unixODBC package if not), then you can test with:
$ isql -3 -v friendly_database_name
Ensure there's not a firewall blocking you:
I'm not sure why the tsql command is failing for you, it should return the 1> prompt. Ensure that you can establish a telnet connection to the database server:
$ telnet fr0-iacls-190.eu.company.corp 10001
which should give you something like:
Trying 12.34.56.78...
Connected to fr0-iacls-190.eu.company.corp.
Escape character is '^]'
and then to ctrl + ] and type quit to exit (or do ctrl + c to cancel if the telnet test fails).