Linux RabbitMQ cluster construction process diagram

1. Overall steps

At the beginning, we introduced how to install and run RabbitMQ services, but these are stand-alone versions and cannot meet the requirements of current real applications. What should I do if the RabbitMQ server encounters a memory crash, a machine power outage, or a motherboard failure? A single RabbitMQ server can meet the throughput of 1,000 messages per second. What if the application requires the RabbitMQ service to meet the throughput of 100,000 messages per second? Purchasing expensive servers to enhance the performance of a single-machine RabbitMQ service is not enough. Building a RabbitMQ cluster is the key to solving practical problems.

First, we need 3 Linux operating systems. Here I have cloned them completely. You can see it based on your situation.

Then modify the host names of the three Linux operating systems

vim /etc/hostname

After making the changes here, it is recommended to restart them all (reboot).

After restarting, configure the hosts file of each node so that each node can recognize each other.

vim /etc/hosts

Next, to ensure that the cookie files of each node use the same value, execute the remote operation command on node1.

scp /var/lib/rabbitmq/.erlang.cookie root@node2:/var/lib/rabbitmq/.erlang.cookie
scp /var/lib/rabbitmq/.erlang.cookie root@node3:/var/lib/rabbitmq/.erlang.cookie

Start the RabbitMQ service, and also start the Erlang virtual machine and the RbbitMQ application service (execute the following commands on each of the three nodes)

rabbitmq-server-detached

The next thing to do is to add node node3 to node1 and node node2 to node3. (You can also add node3 to node1, and node2 to node1, it's the same)

One thing to note here is: turn off the firewall! ! !

After the node is added, we can check the cluster status

rabbitmqctl cluster_status

Next, we need RabbitMQ account information. Just add it, set the username, password, and grant all permissions.

Create Account
rabbitmqctl add_user admin 123
Setting User Roles
rabbitmqctl set_user_tags admin administrator
Setting User Permissions
rabbitmqctl set_permissions -p "/" admin ".*" ".*" ".*"

At this point, the cluster setup is complete. Finally, you can access the RabbitMQ backend web management console in the browser. You can see that the cluster information is fully presented! ! !

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