无法在Docker容器内使用FreeTDS连接到Microsoft SQL Server。

Question

我想在公司网络上使用Docker for Windows托管Shiny应用程序。

我如何设置Docker、odbc.ini、odbcinst.ini、freetds.conf或可能的其他文件，以便我的Shiny应用程序可以从内部Microsoft SQL Server (2016)数据库中查询数据？数据库服务器不是运行在运行Docker容器的同一台机器上。

我不知道我是否需要一个较新版本的FreeTDS，或者我是否错误地配置了其中的一个文件。我试着使用IP地址到服务器，而不是使用 sql-server.host.com 在所有文件中，但得到相同的错误信息，如下所示。

$ tsql -C 输出。

Compile-time settings (established with the "configure" script)
                            Version: freetds v1.00.104
             freetds.conf directory: /etc/freetds
     MS db-lib source compatibility: no
        Sybase binary compatibility: yes
                      Thread safety: yes
                      iconv library: yes
                        TDS version: 4.2
                              iODBC: no
                           unixodbc: yes
              SSPI "trusted" logins: no
                           Kerberos: yes
                            OpenSSL: no
                             GnuTLS: yes
                               MARS: no

$ odbcinst -j 输出。

unixODBC 2.3.6
DRIVERS............: /etc/odbcinst.ini
SYSTEM DATA SOURCES: /etc/odbc.ini
FILE DATA SOURCES..: /etc/ODBCDataSources
USER DATA SOURCES..: /root/.odbc.ini
SQLULEN Size.......: 8
SQLLEN Size........: 8
SQLSETPOSIROW Size.: 8

$ cat etc/odbcinst.ini 输出。

[FreeTDS]
Description = FreeTDS unixODBC Driver
Driver = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so

$ cat etc/odbc.ini 输出。

[sql-server]
driver = FreeTDS
server = sql-server.host.com
port = 1433
TDS_Version = 4.2

$ cat etc/freetds/freetds.conf 输出。

[sql-server]
host = sql-server.host.com
port = 1433
tds version = 4.2

R中的命令出错。

con <- dbConnect(odbc::odbc(),
          driver = "FreeTDS",
          server = "sql-server.host.com",
          port = 1433,
          database = "database name",
          TDS_Version = 4.2)

错误：

Error: nanodbc/nanodbc.cpp:950: 08001: [FreeTDS][SQL Server]Unable to connect to data source 
Execution halted

Docker文件。

# Install R version 3.5.3
FROM r-base:3.5.3

# Install Ubuntu packages
RUN apt-get update && apt-get install -y \
    sudo \
    gdebi-core \
    pandoc \
    pandoc-citeproc \
    libcurl4-gnutls-dev \
    libcairo2-dev/unstable \
    libxt-dev \
    libssl-dev \
    unixodbc unixodbc-dev \
    freetds-bin freetds-dev tdsodbc

# Edit odbc.ini, odbcinst.ini, and freetds.conf files
RUN echo "[sql-server]\n\
host = sql-server.host.com\n\
port = 1433\n\
tds version = 4.2" >> /etc/freetds.conf

RUN echo "[FreeTDS]\n\
Description = FreeTDS unixODBC Driver\n\
Driver = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so" >> /etc/odbcinst.ini

RUN echo "[sql-server]\n\
driver = FreeTDS\n\
server = sql-server.host.com\n\
port = 1433\n\
TDS_Version = 4.2" >> /etc/odbc.ini

# Install R packages that are required
RUN R -e "install.packages(c('shiny', 'DBI', 'odbc'), repos='http://cran.rstudio.com/')"

# copy the app to the image
RUN mkdir /root/shiny_example
COPY app /root/shiny_example

COPY Rprofile.site /usr/lib/R/etc/

# Make the ShinyApp available at port 801
EXPOSE 801

CMD ["R", "-e", "shiny::runApp('/root/shiny_example')"]

Docker构建和运行命令。

docker build . -t shiny_example
docker run -it --network=host -p 801:801 shiny_example

请注意，下面的R代码工作在我的Windows机器上运行Docker容器，我可以成功地查询数据库。

library(DBI)
con <- dbConnect(odbc::odbc(),
          driver = "SQL server",
          server = "sql-server.host.com")

$ isql -v sql-server 输出。

[S1000][unixODBC][FreeTDS][SQL Server]Unable to connect to data source
[01000][unixODBC][FreeTDS][SQL Server]Unknown host machine name.
[ISQL]ERROR: Could not SQLConnect

$ tsql -S sql-server 输出。

locale is "en_US.UTF-8"
locale charset is "UTF-8"
using default charset "UTF-8"
Error 20013 (severity 2):
        Unknown host machine name.
There was a problem connecting to the server

显然，我不知道我在做什么。任何关于这方面的帮助都非常感激。

Answer 1

看起来你是正确的，但可能错过了一点。我也有类似的问题，但我能够解决它!

在 python+mssqlserver+pymssql+docker(unbuntu16.04 base image)

在没有修复的情况下，我的代码(使用pymssql)在运行时是 给我这个错误

Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
  File "src/pymssql.pyx", line 645, in pymssql.connect
pymssql.InterfaceError: Connection to the database failed for an unknown reason.

I 随后 创建了3个文件，并复制到图像中!

• 使用 myserver.orgName.com MSsql服务器所在的地方。dockerodbcinst.ini

[FreeTDS]
Description = v0.91 with protocol v7.3
Driver = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so

dockerodbc.ini

[myserverdsn]
Driver = FreeTDS
Server = myserver.orgName.com
Port = 1433
TDS_Version = 7.3

dockerfreetds.conf

[global]
    # TDS protocol version, use:
    # 7.3 for SQL Server 2008 or greater (tested through 2014)
    # 7.2 for SQL Server 2005
    # 7.1 for SQL Server 2000
    # 7.0 for SQL Server 7
    tds version = 7.2
    port = 1433

    # Whether to write a TDSDUMP file for diagnostic purposes
    # (setting this to /tmp is insecure on a multi-user system)
;   dump file = /tmp/freetds.log
;   debug flags = 0xffff

    # Command and connection timeouts
;   timeout = 10
;   connect timeout = 10

    # If you get out-of-memory errors, it may mean that your client
    # is trying to allocate a huge buffer for a TEXT field.
    # Try setting 'text size' to a more reasonable limit
    text size = 64512

# A typical Microsoft server
[myserverdsn]
    host = myserver.orgName.com
    port = 1433
    tds version = 7.3

Docker文件内容

RUN apt-get -y install unixodbc unixodbc-dev freetds-dev freetds-bin tdsodbc 

COPY freetds.conf /etc/freetds/freetds.conf
COPY odbc.ini /etc/odbc.ini
COPY odbcinst.ini /etc/odbcinst.ini

测试python代码的工作。

python 
>>> import pymssql
>>> conn = pymssql.connect(server = 'myserver.orgName.com',
                   user = 'myusername',
                      password = 'mypassword',
                      database= 'mydbname')

工作无误！