Comment 14 for bug 1784757

# my method to fix the problem in Bionic for now is simple, borrowing from the upstream Debian patch:

sudo nano /lib/systemd/system/rabbitmq-server.service

# make the [Unit] definition look like this:
[Unit]
Description=RabbitMQ Messaging Server
After=network.target epmd@0.0.0.0.socket
Wants=network.target epmd@0.0.0.0.socket

# then reload and reboot, no more delay at Rabbitmq
sudo systemctl daemon-reload
sudo systemctl restart rabbitmq-server.service

sudo shutdown -r now