title: pip search finds tensorflow, but pip install does not
body: <p>I am trying to build a Django app that would use Keras models to make recommendations. Right now I'm trying to use one custom container that would hold both Django and Keras. Here's the Dockerfile I've written.</p>
  
  <pre><code># myproject/docker/app/Dockerfile
  
  FROM python:3.7-alpine  # I've tried 3.5, 3.6 and 3.7
  
  RUN apk add --no-cache postgresql-libs &amp;&amp; \
    apk add --no-cache --virtual .build-deps \
      gfortran \
      build-base \
      freetype-dev \
      libpng-dev \
      openblas-dev \
      postgresql-dev \
      python3-dev \
      wget
  
  WORKDIR /app
  COPY ./misc/requirements.txt /app/
  RUN pip search tensorflow
  RUN pip install tensorflow
  RUN pip install -r /app/requirements.txt
  
  COPY . /app
  
  EXPOSE 8000
  ENTRYPOINT ["exec /start.sh"]
  </code></pre>
  
  <p>Problem is, when I try to build app image, pip can't install tensorflow, even though <code>pip search tensorflow</code> lists tensorflow (1.12) in results.</p>
  
  <pre><code>$ docker-compose -f "docker/docker-compose.yml" --project-directory /path/to/myproject build
  psql uses an image, skipping
  redis uses an image, skipping
  Building app
  Step 1/12 : FROM python:3.7-alpine
  3.7-alpine: Pulling from library/python
  cd784148e348: Already exists
  a5ca736b15eb: Already exists
  f320f547ff02: Pull complete
  2edd8ff8cb8f: Pull complete
  9381128744b2: Pull complete
  Digest: sha256:f708ad35a86f079e860ecdd05e1da7844fd877b58238e7a9a588b2ca3b1534d8
  Status: Downloaded newer image for python:3.7-alpine
   ---&gt; 1a8edcb29ce4
  Step 2/12 : ENV PYTHONBUFFERED 1
   ---&gt; Running in 5178b24df888
  Removing intermediate container 5178b24df888
   ---&gt; 0f928fbf30f1
  Step 3/12 : RUN apk add --no-cache postgresql-libs &amp;&amp;   apk add --no-cache --virtual .build-deps     gfortran     build-base     freetype-dev     libpng-dev     openblas-dev     postgresql-dev     python3-dev     wget
   ---&gt; Running in 2a8f4653e3f9
  fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/main/x86_64/APKINDEX.tar.gz
  fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/community/x86_64/APKINDEX.tar.gz
  (1/5) Installing db (5.3.28-r0)
  (2/5) Installing libsasl (2.1.26-r14)
  (3/5) Installing libldap (2.4.46-r0)
  (4/5) Installing libpq (10.5-r0)
  (5/5) Installing postgresql-libs (10.5-r0)
  OK: 19 MiB in 39 packages
  fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/main/x86_64/APKINDEX.tar.gz
  fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/community/x86_64/APKINDEX.tar.gz
  (1/36) Installing binutils (2.30-r5)
  (2/36) Installing gmp (6.1.2-r1)
  (3/36) Installing isl (0.18-r0)
  (4/36) Installing libgomp (6.4.0-r9)
  (5/36) Installing libatomic (6.4.0-r9)
  (6/36) Installing pkgconf (1.5.3-r0)
  (7/36) Installing libgcc (6.4.0-r9)
  (8/36) Installing mpfr3 (3.1.5-r1)
  (9/36) Installing mpc1 (1.0.3-r1)
  (10/36) Installing libstdc++ (6.4.0-r9)
  (11/36) Installing gcc (6.4.0-r9)
  (12/36) Installing libquadmath (6.4.0-r9)
  (13/36) Installing libgfortran (6.4.0-r9)
  (14/36) Installing gfortran (6.4.0-r9)
  (15/36) Installing libmagic (5.32-r0)
  (16/36) Installing file (5.32-r0)
  (17/36) Installing musl-dev (1.1.19-r10)
  (18/36) Installing libc-dev (0.7.1-r0)
  (19/36) Installing g++ (6.4.0-r9)
  (20/36) Installing make (4.2.1-r2)
  (21/36) Installing fortify-headers (0.9-r0)
  (22/36) Installing build-base (0.5-r1)
  (23/36) Installing libpng (1.6.34-r1)
  (24/36) Installing freetype (2.9.1-r1)
  (25/36) Installing zlib-dev (1.2.11-r1)
  (26/36) Installing libpng-dev (1.6.34-r1)
  (27/36) Installing freetype-dev (2.9.1-r1)
  (28/36) Installing openblas-ilp64 (0.3.0-r0)
  (29/36) Installing openblas (0.3.0-r0)
  (30/36) Installing openblas-dev (0.3.0-r0)
  (31/36) Installing libressl-dev (2.7.4-r0)
  (32/36) Installing postgresql-dev (10.5-r0)
  (33/36) Installing python3 (3.6.6-r0)
  (34/36) Installing python3-dev (3.6.6-r0)
  (35/36) Installing wget (1.19.5-r0)
  (36/36) Installing .build-deps (0)
  Executing busybox-1.28.4-r2.trigger
  OK: 488 MiB in 75 packages
  Removing intermediate container 2a8f4653e3f9
   ---&gt; 0a6733c0891e
  Step 4/12 : WORKDIR /app
   ---&gt; Running in e99a4dadbd78
  Removing intermediate container e99a4dadbd78
   ---&gt; 11d698c20e86
  Step 5/12 : COPY ./misc/requirements.txt /app/
   ---&gt; aa6b85587b84
  Step 6/12 : RUN pip search tensorflow
   ---&gt; Running in a4434a87e740
  tensorflow (1.12.0)                                      - TensorFlow is an open source machine learning framework for everyone.
  tensorflow-qndex (0.0.22)                                - tensorflow-qnd x tensorflow-extenteten
  tensorflow-estimator (1.10.12)                           - TensorFlow Estimator.
  mesh-tensorflow (0.0.5)                                  - Mesh TensorFlow
  tensorflow-io (0.1.0)                                    - TensorFlow IO
  tensorflow-plot (0.2.0)                                  - TensorFlow Plot
  tensorflow-lattice (0.9.8)                               - TensorFlow Lattice provides lattice models in TensorFlow
  tensorflow-datasets (0.0.2)                              - tensorflow/datasets is a library of datasets ready to use with TensorFlow.
  tensorflow-extenteten (0.0.22)                           - TensorFlow extention library
  cxflow-tensorflow (0.5.0)                                - TensorFlow extension for cxflow.
  emloop-tensorflow (0.1.0)                                - TensorFlow extension for emloop.
  tensorflow-k8s (0.0.2)                                   - Tensorflow serving extension
  tensorflow-transform (0.11.0)                            - A library for data preprocessing with TensorFlow
  dask-tensorflow (0.0.2)                                  - Interactions between Dask and Tensorflow
  tensorflow-tracer (1.1.0)                                - Runtime Tracing Library for TensorFlow
  sagemaker-tensorflow (1.12.0.1.0.0.post1)                - Amazon Sagemaker specific TensorFlow extensions.
  tensorflow-qnd (0.1.11)                                  - Quick and Dirty TensorFlow command framework
  tensorflow-probability (0.5.0)                           - Probabilistic modeling and statistical inference in TensorFlow
  tensorflow-utils (0.1.0)                                 - Classes and methods to make using TensorFlow easier
  tensorflow-model (0.1.1)                                 - Command-line tool to inspect TensorFlow models
  tensorflow-lattice-gpu (0.9.8)                           - TensorFlow Lattice provides lattice models in TensorFlow
  tensorflow-template (0.2)                                - A tensorflow template for quick starting a deep learning project.
  tensorflow-rocm (1.12.0)                                 - TensorFlow is an open source machine learning framework for everyone.
  intel-tensorflow (1.12.0)                                - TensorFlow is an open source machine learning framework for everyone.
  tensorflow-font2char2word2sent2doc (0.0.12)              - TensorFlow implementation of Hierarchical Attention Networks for Document Classification
  tensorflow-gpu (1.12.0)                                  - TensorFlow is an open source machine learning framework for everyone.
  tensorflow-aarch64 (1.2)                                 - Tensorflow r1.2 for aarch64[arm64,pine64] CPU only.
  tensorflow-fedora28 (1.9.0rc0)                           - TensorFlow is an open source machine learning framework for everyone.
  tensorflow-model-analysis (0.11.0)                       - A library for analyzing TensorFlow models
  tensorflow-transform-canary (0.9.0)                      - A library for data preprocessing with TensorFlow
  rav-tensorflow-transform (0.7.0.910)                     - A library for data preprocessing with TensorFlow
  tensorflow-serving-api (1.12.0)                          - TensorFlow Serving Python API.
  tensorflow-serving-client (0.0.10)                       - Python client for tensorflow serving
  tensorflow-hub (0.2.0)                                   - TensorFlow Hub is a library to foster the publication, discovery, and consumption of reusable parts of machine learning models.
  tensorflow-estimator-2.0-preview (1.13.0.dev2019010100)  - TensorFlow Estimator.
  ngraph-tensorflow-bridge (0.8.0)                         - Intel nGraph compiler and runtime for TensorFlow
  tensorflow-probability-gpu (0.4.0)                       - Probabilistic modeling and statistical inference in TensorFlow
  simple-tensorflow-serving (0.6.6)                        - The simpler and easy-to-use serving service for TensorFlow models
  tensorflow-auto-detect (1.11.0)                          - Automatically install CPU or GPU tensorflow determined by looking for a CUDA installation.
  tensorflow-serving-api-python3 (1.8.0)                   - *UNOFFICIAL* TensorFlow Serving API libraries for Python3
  tensorflow-exercise-hx (1.0.1)                           - tensorflow&amp;#32451;&amp;#20064;&amp;#65306;&amp;#40482;&amp;#23614;&amp;#33457;&amp;#31181;&amp;#31867;&amp;#39044;&amp;#27979;&amp;#65292;&amp;#21152;&amp;#24030;&amp;#25151;&amp;#20215;&amp;#39044;&amp;#27979;
  tensorflow-metadata (0.9.0)                              - Library and standards for schema and statistics.
  tensorflow-tensorboard (1.5.1)                           - TensorBoard lets you watch Tensors Flow
  resnet-tensorflow (0.0.1)                                - Deep Residual Neural Network
  mlops-tensorflow (0.1.0)                                 - 
  tensorflow-gpu-macosx (1.8.1)                            - Unoffcial NVIDIA CUDA GPU support version of Google Tensorflow for MAC OSX 10.13. For more info, please check out my github page. I highly recommend you directly download and install it from my github's release. If you insist on compiling it, you'd do it on a shell to debug.
  syntaxnet-with-tensorflow (0.2)                          - SyntaxNet: Neural Models of Syntax
  tensorflow-data-validation (0.11.0)                      - A library for exploring and validating machine learning data.
  ogres (0.0.2)                                            - Thin tensorflow wrapper. Requires tensorflow
  tfmesos (0.0.10)                                         - Tensorflow on Mesos
  tf-estimator-nightly (1.12.0.dev20181217)                - TensorFlow Estimator.
  TFBOYS (0.0.1)                                           - TensorFlow BOYS
  TFTree (0.1.0)                                           - Tree to tensorflow
  tfdebugger (0.1.1)                                       - TensorFlow Debugger
  tfextras (0.0.8)                                         - Tensorflow extras
  tfu (0.0.1.dev0)                                         - tensorflow utils
  tnt (0.12.0.7)                                           - tnt is not tensorflow
  easytf (13.9)                                            - Tensorflow CS
  tftf (0.0.29)                                            - TensorFlow TransFormer
  tf-datasets (0.0.1)                                      - tensorflow/datasets
  tfds-nightly (0.0.2.dev201901020014)                     - tensorflow/datasets is a library of datasets ready to use with TensorFlow.
  tf-common (1.0.0)                                        - A common liberary of tensorflow
  ParticleFlow (0.0.1)                                     - Particle simulations with tensorflow
  tf_decompose (0.1)                                       - Tensor decomposition with TensorFlow
  tensorbase (0.3)                                         - Minimalistic TensorFlow Framework
  miniflow (0.2.9)                                         - Minimal implementation of TensorFlow
  bob.learn.tensorflow (1.0.3)                             - Bob bindings for tensorflow
  quantile-transformer-tf (1.2)                            - An implementation of QuantileTransformer in tensorflow
  tf-env (0.1.0)                                           - RL environments for TensorFlow.
  tfseqestimator (2.2.0)                                   - Sequence estimators for Tensorflow
  wavenet (0.1.2)                                          - An implementation of WaveNet for TensorFlow.
  tf_kaldi_io (0.3.0)                                      - kaldi-io for Tensorflow
  ptfutils (0.0.29)                                        - Useful modules for tensorflow
  iceflow (0.0.1a2)                                        - tensorflow meta-framework
  tf2onnx (0.3.2)                                          - Tensorflow to ONNX converter
  tensorforce (0.4.3)                                      - Reinforcement learning for TensorFlow
  simnets (0.0.1)                                          - SimNets implementation in tensorflow
  saliency (0.0.2)                                         - Saliency methods for TensorFlow
  tensor-lib (1.8.19)                                      - Simplified tensorflow library
  tensorsets (0.1.0)                                       - Standard datasets for TensorFlow.
  tfstage (0.1.7)                                          - TensorFlow project scaffolding
  top-hat (0.0.2)                                          - Recommendation system in TensorFlow
  TensorMol (0.1)                                          - TensorFlow+Molecules = TensorMol
  tfshop (0.0.1)                                           - common tensorflow paradigms
  kfac (0.1.0)                                             - K-FAC for TensorFlow
  transferflow (0.1.8)                                     - Transfer learning for Tensorflow
  train (0.0.3)                                            - Training utilities for TensorFlow.
  vibranium (0.1.0)                                        - Opinionated Tensorflow projects
  tf-data (0.0.4)                                          - Easy datasets for tensorflow
  tensorfunk (0.0.0)                                       - tensorflow model converter to create tensorflow-independent prediction functions.
  tf1 (1.1.0)                                              - F1-score metric for TensorFlow
  tensorboard-easy (0.2.3)                                 - A tensorflow-independent tensorboard logger
  gpflow (1.3.0)                                           - Gaussian process methods in tensorflow
  layer (0.1.14)                                           - tensorflow custom comfort wrapper
  tflab (0.1.3)                                            - A laboratory for experimenting with Tensorflow abstraction
  tensorpack (0.9.0.1)                                     - Neural Network Toolbox on TensorFlow
  tensorflowservingclient (0.5.1.post2)                    - Prebuilt tensorflow serving client
  EasyFlow (0.1.dev3)                                      - Modular Distributed TensorFlow Framework
  tfgraph (0.2)                                            - Python's Tensorflow Graph Library
  serving-utils (0.6.0)                                    - Some utilities for tensorflow serving
  Removing intermediate container a4434a87e740
   ---&gt; a14248285cb2
  Step 7/12 : RUN pip install tensorflow
   ---&gt; Running in 2c14fe29c431
  Collecting tensorflow
    Could not find a version that satisfies the requirement tensorflow (from versions: )
  No matching distribution found for tensorflow
  ERROR: Service 'app' failed to build: The command '/bin/sh -c pip install tensorflow' returned a non-zero code: 1
  </code></pre>
  
  <p>Do I have to resort to building tensorflow from source?</p>
  
  <p>EDIT<br>
  Writing this question made me realize I could use two separate containers: one for my Django app and a prebuilt tensorflow with gpu. I would still like to learn how to resolve issues like this, but any pointers to docs how to make two separate docker containers talk, would be appreciated.</p>