To install python-crush on a CentOS 7 that does not have access to internet, the necessary files must be downloaded via an USB drive. The python34-pip package must be installed from the EPEL repository the machine uses for maintenance purposes.
On the machine with access to internet:
$ sudo pip3 install wheel $ sudo pip3 wheel --wheel-dir /usbdrive crush wheel
On the machine with no access to internet:
$ sudo pip3 install /usbdrive/wheel-* $ sudo pip3 install --no-index --use-wheel --find-links=/usbdrive crush
The crush command can be verified with:
$ crush --help