To do this, we need to install the RabbitMQ broker.
On a macOS, if we are using Homebrew (http://brew.sh/), it's as simple as this:
$ brew install rabbitmq ==> Installing dependencies for rabbitmq: openssl, libpng, libtiff, wx... ==> Pouring openssl-1.0.2j.el_capitan.bottle.tar.gz /usr/local/Cellar/openssl/1.0.2j: 1,695 files, 12M ==> Pouring libpng-1.6.25.el_capitan.bottle.tar.gz /usr/local/Cellar/libpng/1.6.25: 25 files, 1.2M ==> Pouring libtiff-4.0.6_2.el_capitan.bottle.tar.gz /usr/local/Cellar/libtiff/4.0.6_2: 261 files, 3.4M ==> Pouring wxmac-3.0.2_3.el_capitan.bottle.tar.gz /usr/local/Cellar/wxmac/3.0.2_3: 809 files, 23.6M ==> Pouring erlang-19.1.el_capitan.bottle.tar.gz /usr/local/Cellar/erlang/19.1: 7,297 ...