iruby notebook only runs python

Question

I have a new laptop and have installed python 2.7.9 and ipython 3.0.0. I then installed iruby.

Unfortunately, the iruby server runs fine with $ iruby notebook -- but the Jupyter notebook only runs python kernels.

I'm sure there's some subtle bug in the interaction of the newest Jupyter version of the notebook engine, but I haven't been able to sort it out. Does anyone know the incantation to make ths work?

Update

As @cel comments below, this may be simply that pip ipython[all] installs, by default the new iPython/Jupyter server and iRuby doesn't talk to it. I shall try installing an earlier iPython and see what happens.

Answer 1

I found this dockerfile, and followed the commands, which installed an older version of ipython, and now iruby works also.

Answer 2

In my case I observed that iruby tries to run python2-version of jupyter notebook (which is wrong in my case - by default I run python3-based version).

Solution was pretty simple - change default ipython to run python3-based jupyter (I assume that all jupyter binaries are in your /usr/local/bin):

# backup old ipython, is is not symlink!
sudo mv /usr/local/bin/ipython /usr/local/bin/ipython2
# provide ipython symlink pointing to ipython3
sudo ln -s /usr/local/bin/ipython3 /usr/local/bin/ipython