how to install particular version of rabbitmq
wget https://github.com/rabbitmq/rabbitmq-server/releases/download/rabbitmq_v3_6_6/rabbitmq-server_3.6.6-1_all.deb sudo dpkg -i rabbitmq-server_3.6.6-1_all.deb
Here is what the above code is Doing:
1. Installing the Erlang package
2. Downloading the RabbitMQ package
3. Installing the RabbitMQ package