在Docker中设置cassandra驱动程序（python）
几个月前，我使用了一个docker文件：（1）使用base ubuntu镜像，（2）安装miniconda python发行版，（3）使用miniconda安装一些python库，（4）运行以下命令为python设置cassandra驱动程序。
RUN pip install --upgrade pip RUN pip install cassandra-driver 这在六个月前完美运作。 但现在我得到这个例外。
Step 13 : RUN pip install cassandra-driver ---> Running in ba9955650d7c Collecting cassandra-driver Downloading cassandra-driver-3.0.0.tar.gz (186kB) Complete output from command python setup.py egg_info: warning: no files found matching '*.pyx' under directory 'Cython/Debugger/Tests' warning: no files found matching '*.pxd' under directory 'Cython/Debugger/Tests' warning: no files found matching '*.h' under directory 'Cython/Debugger/Tests' warning: no files found matching '*.pxd' under directory 'Cython/Utility' unable to execute 'gcc': No such file or directory Unable to find pgen, not compiling formal grammar. Traceback (most recent call last): File "<string>", line 20, in <module> File "/tmp/pip-build-0XzsPv/cassandra-driver/setup.py", line 375, in <module> run_setup(None) File "/tmp/pip-build-0XzsPv/cassandra-driver/setup.py", line 373, in run_setup **kw) File "/miniconda/lib/python2.7/distutils/core.py", line 111, in setup _setup_distribution = dist = klass(attrs) File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/setuptools/dist.py", line 268, in __init__ File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/setuptools/dist.py", line 312, in fetch_build_eggs File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/pkg_resources/__init__.py", line 846, in resolve File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/pkg_resources/__init__.py", line 1091, in best_match File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/pkg_resources/__init__.py", line 1103, in obtain File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/setuptools/dist.py", line 379, in fetch_build_egg File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/setuptools/command/easy_install.py", line 639, in easy_install File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/setuptools/command/easy_install.py", line 669, in install_item File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/setuptools/command/easy_install.py", line 852, in install_eggs File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/setuptools/command/easy_install.py", line 1080, in build_and_install File "/miniconda/lib/python2.7/site-packages/setuptools-19.1.1-py2.7.egg/setuptools/command/easy_install.py", line 1068, in run_setup distutils.errors.DistutilsError: Setup script exited with error: command 'gcc' failed with exit status 1 ---------------------------------------- Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-0XzsPv/cassandra-driver The command '/bin/sh -c pip install cassandra-driver' returned a non-zero code: 1
什么可能会出错？ 安装软件包是否损坏，或者我没有做对吗？
python cassandra-driver 从2.7.0版本开始默认使用Cython扩展，但是对于那些不容易访问cython发行版或者不需要它的人来说，这可能是一个很好的select以及。 cython扩展为性能提供了一个好处，但是它可能不适合很多情况（尤其是在你没有做高吞吐量的情况下）。
从安装文档 ：
默认情况下，该软件包使用Cython来优化核心模块并构build自定义扩展。 这不是一个很难的要求，但是默认情况下它是为了构build比纯Python实现更好的性能的扩展。
使用构build开关或环境variables可以避免此构build阶段：
python setup.py install --no-cython -or- pip install --install-option="--no-cython" <spec-or-path>
或者，无论上下文如何，都可以使用环境variables来切换此选项：
CASS_DRIVER_NO_CYTHON=1 <your script here>
为了安装cassandra-driver你需要编译一些C源文件，但是你的容器里没有gcc ：
unable to execute 'gcc': No such file or directory
尝试在安装cassandra-driver之前安装gcc和python-dev软件包：
RUN apt-get update \ && apt-get install -y --no-install-recommends \ python-dev \ gcc \ && rm -rf /var/lib/apt/lists/*