使用Anaconda的Python 3版本创建到MSSQL服务器的ODBC连接时遇到错误：

pyodbc.Error: (‘HY000’, ‘[HY000] [Microsoft][ODBC Driver 17 for SQL Server]SSPI Provider: No Kerberos credentials available (default cache: KEYRING:persistent:1918003883) (851968) (SQLDriverConnect)’)

服务器已通过SSSD加入Windows Active Directory域和Kerberos域.我可以通过SSH连接到服务器,并使用kinit检索TGT.我甚至可以使用klist查看凭证缓存.但是python进程似乎无法找到Kerberos TGT或Kerberos凭据缓存.

设置：

Python

$/mnt/ds/anaconda3/bin/python --version

Python 3.6.5 :: Anaconda, Inc.

test.py

from pyodbc import connect

connection = connect('DSN=MyDSN')

/etc/odbc.ini

[MyDSN]

#Driver=ODBC Driver 13 for SQL Server

Driver=ODBC Driver 17 for SQL Server

Description=MyMSSQL ODBC Driver

Trace=No

Server=MyMSSQL

Trusted_Connection=Yes

/etc/odbcinst.ini

[ODBC Driver 17 for SQL Server]

Description=Microsoft ODBC Driver 17 for SQL Server

Driver=/opt/microsoft/msodbcsql17/lib64/libmsodbcsql-17.1.so.0.1

UsageCount=1

红帽企业Linux

$cat /etc/redhat-release

Red Hat Enterprise Linux Server release 7.5 (Maipo)

$uname -r

3.10.0-862.2.3.el7.x86_64

msodbcsql17

$sudo yum info msodbcsql17

Loaded plugins: amazon-id, rhui-lb, search-disabled-repos

Installed Packages

Name : msodbcsql17

Arch : x86_64

Version : 17.1.0.1

Release : 1

Size : 17 M

Repo : installed

From repo : packages-microsoft-com-prod

Summary : ODBC Driver for Microsoft(R) SQL Server(R)

License : https://aka.ms/odbc170eula

Description : This package provides an ODBC driver that can connect to Microsoft(R) SQL Server(R).

的unixODBC

$sudo yum info unixODBC

Loaded plugins: amazon-id, rhui-lb, search-disabled-repos

Installed Packages

Name : unixODBC

Arch : x86_64

Version : 2.3.1

Release : 11.el7

Size : 1.2 M

Repo : installed

From repo : rhui-REGION-rhel-server-releases

Summary : A complete ODBC driver manager for Linux

URL : http://www.unixODBC.org/

License : GPLv2+ and LGPLv2+

Description : Install unixODBC if you want to access databases through ODBC.

: You will also need the mysql-connector-odbc package if you want to access

: a MySQL database, and/or the postgresql-odbc package for PostgreSQL.

$/mnt/ds/anaconda3/bin/conda list unixodbc

# packages in environment at /mnt/ds/anaconda3:

#

# Name Version Build Channel

unixodbc 2.3.6 h1bed415_0

pyodbc

$/mnt/ds/anaconda3/bin/conda list pyodbc

# packages in environment at /mnt/ds/anaconda3:

#

# Name Version Build Channel

pyodbc 4.0.23 py36hf484d3e_0

以下是我尝试过的一些事情：

>使用由Anaconda2打包的Python-2.7.15.那很有效！

>使用isql.我运行isql MyDSN并连接.

>有两个unixODBC库(一个通过yum安装;另一个通过conda安装).默认情况下,它将使用conda,但我强制它使用系统unixODBC包和LD_PRELOAD.同样的错误.

>我尝试将数据库驱动程序降级为msodbcsql-13.1.9.2-1,然后降级为msodbcsql-13.0.1.0-1.同样的错误.

>我尝试换掉另一个Python ODBC库TurbODBC的PyODBC.同样的错误.

>我使用python-3.5在conda中创建了一个单独的环境.这很有效！仍然不确定为什么.

>我写了一个与unixODBC接口的简单C程序.该程序能够通过Kerberos连接到MSSQL服务器就好了.

>我通过strace运行python2正面测试用例和python3负面测试用例来检查系统调用.我认为这可能会揭示一些东西.看起来他们都开始在文件系统上查找client.keytab文件.然后,在正面测试案例中,它将回退到搜索内核的密钥环,它将成功找到凭证缓存并继续.但是,在否定测试用例中,它只是重试找到client.keytab,并且从不尝试搜索密钥环.

>我启用了unixODBC跟踪选项,一个使用Python3测试用例,另一个使用Python2测试用例.不幸的是,痕迹(如下所示)并没有向我揭示任何内容.

PY3-unixodbc.trace

[ODBC][8741][1527046794.480751][__handles.c][460]

Exit:[SQL_SUCCESS]

Environment = 0x55eea73ed130

[ODBC][8741][1527046794.480806][SQLSetEnvAttr.c][189]

Entry:

Environment = 0x55eea73ed130

Attribute = SQL_ATTR_ODBC_VERSION

Value = 0x3

StrLen = 4

[ODBC][8741][1527046794.480824][SQLSetEnvAttr.c][363]

Exit:[SQL_SUCCESS]

[ODBC][8741][1527046794.480843][SQLAllocHandle.c][375]

Entry:

Handle Type = 2

Input Handle = 0x55eea73ed130

[ODBC][8741][1527046794.480861][SQLAllocHandle.c][493]

Exit:[SQL_SUCCESS]

Output Handle = 0x55eea7400500

[ODBC][8741][1527046794.481176][SQLDriverConnectW.c][290]

Entry:

Connection = 0x55eea7400500

Window Hdl = (nil)

Str In = [DSN=MyDSN][length = 15]

Str Out = (nil)

Str Out Max = 0

Str Out Ptr = (nil)

Completion = 0

UNICODE Using encoding ASCII 'ISO8859-1' and UNICODE 'UCS-2LE'

[ODBC][8741][1527046794.575566][__handles.c][460]

Exit:[SQL_SUCCESS]

Environment = 0x55eea746e360

[ODBC][8741][1527046794.575614][SQLGetEnvAttr.c][157]

Entry:

Environment = 0x55eea746e360

Attribute = 65002

Value = 0x7ffd399177f0

Buffer Len = 128

StrLen = 0x7ffd3991778c

[ODBC][8741][1527046794.575632][SQLGetEnvAttr.c][264]

Exit:[SQL_SUCCESS]

[ODBC][8741][1527046794.575651][SQLFreeHandle.c][219]

Entry:

Handle Type = 1

Input Handle = 0x55eea746e360

PY2-unixodbc.trace

[ODBC][8746][1527046842.073439][__handles.c][460]

Exit:[SQL_SUCCESS]

Environment = 0x185e2e0

[ODBC][8746][1527046842.073530][SQLSetEnvAttr.c][189]

Entry:

Environment = 0x185e2e0

Attribute = SQL_ATTR_ODBC_VERSION

Value = 0x3

StrLen = 4

[ODBC][8746][1527046842.073552][SQLSetEnvAttr.c][363]

Exit:[SQL_SUCCESS]

[ODBC][8746][1527046842.073572][SQLAllocHandle.c][375]

Entry:

Handle Type = 2

Input Handle = 0x185e2e0

[ODBC][8746][1527046842.073590][SQLAllocHandle.c][493]

Exit:[SQL_SUCCESS]

Output Handle = 0x1857d40

[ODBC][8746][1527046842.073613][SQLDriverConnectW.c][290]

Entry:

Connection = 0x1857d40

Window Hdl = (nil)

Str In = [DSN=MyDSN][length = 15]

Str Out = (nil)

Str Out Max = 0

Str Out Ptr = (nil)

Completion = 0

UNICODE Using encoding ASCII 'ISO8859-1' and UNICODE 'UCS-2LE'

[ODBC][8746][1527046842.208760][__handles.c][460]

Exit:[SQL_SUCCESS]

Environment = 0x1967210

[ODBC][8746][1527046842.208830][SQLGetEnvAttr.c][157]

Entry:

Environment = 0x1967210

Attribute = 65002

Value = 0x7ffe1153fcf0

Buffer Len = 128

StrLen = 0x7ffe1153fc8c

[ODBC][8746][1527046842.208849][SQLGetEnvAttr.c][264]

Exit:[SQL_SUCCESS]

[ODBC][8746][1527046842.208869][SQLFreeHandle.c][219]

Entry:

Handle Type = 1

Input Handle = 0x1967210

我只想说,我的智慧结束了.任何想法将不胜感激！