pip install --upgrade virtualenv

[zany@hermes virtual]$ pip install --upgrade virtualenv
Requirement already up-to-date: virtualenv in /home/zany/usr/tools/python/python-3.6.3/lib/python3.6/site-packages

virtualenv --system-site-packages -p python3 tensorflow

[zany@hermes virtual]$ virtualenv --system-site-packages -p python3 tensorflow
Running virtualenv with interpreter /home/zany/usr/tools/python/current/bin/python3
Using base prefix '/home/zany/usr/tools/python/current'
New python executable in /home/zany/usr/tools/python/virtual/tensorflow/bin/python3
Also creating executable in /home/zany/usr/tools/python/virtual/tensorflow/bin/python
Installing setuptools, pip, wheel...done.

tensorflow 가상 환경이 생성되었는지 확인한다.
현재 디렉토리에 'tensorflow' 디렉토리가 생겼으면 된다.

[zany@hermes virtual]$ ls
crypto  flask  tensorflow

tensorflow 가상 환경을 로드하고,
1) 프롬프트가 (가상환경이름) PS 로 바뀌었는지 확인한다.
2) 제대로 로드되었는지 확인하기 위해 which 명령으로 python 명령어와 pip 명령이 어디 있는지 확인한다.
"가상 환경/bin" 디렉토리를 가리키고 있으면 OK.

. ./tensorflow/bin/activate
또는
source ./tensorflow/bin/activate

[zany@hermes virtual]$ . ./tensorflow/bin/activate
(tensorflow) [zany@hermes virtual]$

(tensorflow) [zany@hermes virtual]$ which python
~/usr/tools/python/virtual/tensorflow/bin/python

(tensorflow) [zany@hermes virtual]$ which pip
~/usr/tools/python/virtual/tensorflow/bin/pip

pip install --upgrade tensorflow

(tensorflow) [zany@hermes virtual]$ pip install --upgrade tensorflow
Collecting tensorflow
  Downloading tensorflow-1.4.0-cp36-cp36m-manylinux1_x86_64.whl (41.2MB)
    100% |████████████████████████████████| 41.2MB 29kB/s
Collecting numpy>=1.12.1 (from tensorflow)
  Downloading numpy-1.13.3-cp36-cp36m-manylinux1_x86_64.whl (17.0MB)
    100% |████████████████████████████████| 17.0MB 94kB/s
Collecting tensorflow-tensorboard<0.5.0,>=0.4.0rc1 (from tensorflow)
  Downloading tensorflow_tensorboard-0.4.0rc2-py3-none-any.whl (1.7MB)
    100% |████████████████████████████████| 1.7MB 938kB/s
Collecting six>=1.10.0 (from tensorflow)
  Downloading six-1.11.0-py2.py3-none-any.whl
Collecting protobuf>=3.3.0 (from tensorflow)
  Downloading protobuf-3.4.0-cp36-cp36m-manylinux1_x86_64.whl (6.2MB)
    100% |████████████████████████████████| 6.2MB 266kB/s
Requirement already up-to-date: wheel>=0.26 in ./tensorflow/lib/python3.6/site-packages (from tensorflow)
Collecting enum34>=1.1.6 (from tensorflow)
  Downloading enum34-1.1.6-py3-none-any.whl
Collecting bleach==1.5.0 (from tensorflow-tensorboard<0.5.0,>=0.4.0rc1->tensorflow)
  Downloading bleach-1.5.0-py2.py3-none-any.whl
Collecting markdown>=2.6.8 (from tensorflow-tensorboard<0.5.0,>=0.4.0rc1->tensorflow)
  Downloading Markdown-2.6.9.tar.gz (271kB)
    100% |████████████████████████████████| 276kB 4.0MB/s
Collecting werkzeug>=0.11.10 (from tensorflow-tensorboard<0.5.0,>=0.4.0rc1->tensorflow)
  Using cached Werkzeug-0.12.2-py2.py3-none-any.whl
Collecting html5lib==0.9999999 (from tensorflow-tensorboard<0.5.0,>=0.4.0rc1->tensorflow)
  Downloading html5lib-0.9999999.tar.gz (889kB)
    100% |████████████████████████████████| 890kB 1.7MB/s
Requirement already up-to-date: setuptools in ./tensorflow/lib/python3.6/site-packages (from protobuf>=3.3.0->tensorflow)
Building wheels for collected packages: markdown, html5lib
  Running setup.py bdist_wheel for markdown ... done
  Stored in directory: /home/zany/.cache/pip/wheels/bf/46/10/c93e17ae86ae3b3a919c7b39dad3b5ccf09aeb066419e5c1e5
  Running setup.py bdist_wheel for html5lib ... done
  Stored in directory: /home/zany/.cache/pip/wheels/6f/85/6c/56b8e1292c6214c4eb73b9dda50f53e8e977bf65989373c962
Successfully built markdown html5lib
Installing collected packages: numpy, six, html5lib, bleach, markdown, werkzeug, protobuf, tensorflow-tensorboard, enum34, tensorflow
Successfully installed bleach-1.5.0 enum34-1.1.6 html5lib-0.9999999 markdown-2.6.9 numpy-1.13.3 protobuf-3.4.0 six-1.11.0 tensorflow-1.4.0 tensorflow-tensorboard-0.4.0rc2 werkzeug-0.12.2
(tensorflow) [zany@hermes virtual]$

python 콘솔을 열어, 아래 코드가 동작하면 정상.

(tensorflow) [zany@hermes virtual]$ python
Python 3.6.3 (default, Nov  2 2017, 20:07:42)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tensorflow as tf
/home/zany/usr/tools/python/virtual/tensorflow/lib/python3.6/importlib/_bootstrap.py:219: RuntimeWarning: compiletime version 3.5 of module 'tensorflow.python.framework.fast_tensor_util' does not match runtime version 3.6
  return f(*args, **kwds)
>>> import os
>>> os.environ['TF_CPP_MIN_LOG_LEVEL']='2'
>>> hello = tf.constant('hello, tensorflow')
>>> sess = tf.Session()
>>> print(sess.run(hello))
b'hello, tensorflow'
>>>

deactivate

(tensorflow) [zany@hermes virtual]$ deactivate
[zany@hermes virtual]$