fadygamilm / go-rabbitmq

go-rabbitmq

step.1 - run container

• create a new network so all instances can talk to each other

make rabbit-network

• spin rabbitmq docker container

make rabbit-instance

• if we explored the container

➜ go-rabbitmq git:(main) docker container ps
CONTAINER ID   IMAGE                  COMMAND                  CREATED          STATUS          PORTS                                                 NAMES
abbfe94ed74a   rabbitmq               "docker-entrypoint.s…"   18 minutes ago   Up 17 minutes   4369/tcp, 5671-5672/tcp, 15691-15692/tcp, 25672/tcp   rabbit-1

notice that :

• if we run inside a cluster, the port is the 4369/tcp
• if we have another application needs to communicate to the queue and consume it, the port is 5671-5672/tcp

step.2 - enable management ui

• open bash inside the container by running

make rabbit-bash

• then run this command via the rabbitmq-plugin cli

rabbitmq-plugins enable rabbitmq_management

• make a http request on the browser to localhost:15672
  
• the port that I am pointing to is the port that we will use for the application that publishs msgs to the queue

Theory

• Channel is a vritual connection to a specific queue

Authentication between cluster nodes

once the container is running, execute the following

docker exec -it $(host_name) cat /var/lib/rabbitmq/.erlang.cookie

and this will print the cookie for you so we can use it in our rabbitmq instances to talk to each others

• in order to form a cluster, we have to reset the node before joining the cluster
• so i will join all the nodes in node-1's cluster using the following commands
  

    # stop_app will stop the process but keep container running 
	docker exec -it rabbit-node-2 rabbitmqctl stop_app
    # reset all data
	docker exec -it rabbit-node-2 rabbitmqctl reset
    # join the node1 cluster
	docker exec -it rabbit-node-2 rabbitmqctl join_cluster rabbit@rabbit-1
    # start the process again 
	docker exec -it rabbit-node-2 rabbitmqctl start_app
    # print new cluster info 
	docker exec -it rabbit-node-2 rabbitmqctl cluster_status