r - 无法使用 FreeTDS 连接到 Docker 容器内的 Microsoft SQL Server

Question

我想使用 Docker for Windows 在我的公司网络上托管 Shiny 应用程序。

如何设置 Docker、odbc.ini、odbcinst.ini、freetds.conf 或其他可能的文件，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？数据库服务器未在运行 Docker 容器的同一台机器上运行。

我不知道我是否需要更新版本的 FreeTDS，或者我是否错误配置了其中一个文件。我尝试使用服务器的 IP 地址而不是sql-server.host.com所有文件，但在下面得到相同的错误消息。

$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中的命令给出错误：

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

码头工人文件：

# 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，以下 R 代码适用于我的运行 Docker 容器的 Windows 机器，我可以成功查询数据库：

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

标签： rsql-serverdockershinyfreetds

Answer 1

看起来你是正确的，但可能错过了一点。我有类似的问题，但我能够解决它！

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

在没有修复结束的情况下，运行我的代码（使用 pymssql）给了我这个错误

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.

我跟着创建了3个文件并复制到图像中！

• myserver.orgName.com在托管 MSsql 服务器的地方 使用。码头工人/odbcinst.ini

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

码头工人/odbc.ini

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

码头工人/freetds.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

Dockerfile 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

测试有效的python代码：

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

工作没有错误！