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Cluster vertX + rabbitMQ

By following this tutorial, you will be able to make a vertX cluster that will be tolerant to failure. The main node job is to read messages from a rabbitMQ message queue.

If the main node goes down, one of other standby node will take over and continue to read the messages from the queue. During a take over, there is no message lost.

In order to make the cluster work follow this step :

1. Uninstall OpenJDK and / or old version of Oracle Java

sudo apt-get purge openjdk*
sudo apt-get purge java7*
sudo apt-get autoremove

2. Install latest version of Oracle Java

sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com EEA14886

If you have an dirmngr error —> sudo apt-get install dirmngr

Go to this file

sudo vim /etc/apt/sources.list

Add the following lines

deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main

Install Java

sudo apt-get update
sudo apt-get install oracle-java8-installer
sudo apt-get install oracle-java8-set-default

Check success

java -version

Source : https://raspberrypi.stackexchange.com/questions/45976/how-do-i-update-java-8-in-raspbian

3. Installation of Vert.x

Download the full of Vert.x : http://vertx.io/download/

Extract and move the folder “vertx “ into “~”

Add to .bashrc

export PATH=$PATH:~/vertx/bin

Run source .bashrc

4. Configuration of Vert.x

Go the this file cloudiot_cluster_vertx/core-examples/src/main/java/io/vertx/example/core/ha/Server.java and check if the following parameter are correct with the rabbitMQ configuration.

String QUEUE_NAME = "task_queue"; // Name of the queue
// PARAMETRE DE CONNEXION RABBITMQ
RabbitMQOptions config = new RabbitMQOptions();
config.setUser("test");
config.setPassword("test");
config.setHost("10.45.0.254"); // IP address of rabbitMQ cluster

Next, go to cloudiot_cluster_vertx/core-examples/src/main/resources/cluster.xml and modify the IP to match your network

  <tcp-ip enabled="false">
    <interface>192.168.1.*</interface>
  </tcp-ip>
</join>
<interfaces enabled="true">
  <interface>192.168.1.*</interface>
</interfaces>

5. Configuration of rabbitMQ

Make sure you have the rabbitMQ cluster up and running with messages in the queue.

To send messages into the queue, you can use the python script under rabbitMQ/send.py.

Don't forget to change the script to match your rabbitMQ configuration.

6. Compile Vert.x project

If you don't want to install maven on every Raspberry Pi, on your computer run the following command

mvn clean package

When this is done, you can upload the folder to your Raspberry Pis with scp

scp -r cloudiot_cluster_vertx/ [email protected]

On the RPI server (one in the cluster), get in the core-examples/target/classes and execute

vertx run io.vertx.example.core.ha.Server -ha -cp target/classes -cluster-host [ADDRESSE_IP_RPI]

On the RPI backup (every other RPI, get in the core-examples/target/classes and execute

vertx bare -cp target/classes/ -cluster-host [ADDRESSE_IP_RPI] 

The deployment of the verticle is quiet long (for the server and backup), so be patient !

On the server, you should see in the console something like this

Got Message : #5771 17.4752025023 11/23/17 00:03:20
Got Message : #5772 18.0021845919 11/23/17 00:03:20
Got Message : #5773 15.6700641506 11/23/17 00:03:20
Got Message : #5774 18.4193061289 11/23/17 00:03:20
Got Message : #5775 10.5818496117 11/23/17 00:03:20

If you have an error like io.vertx.core.impl.NoStackTraceThrowable: Not connected, it propably means that the vertx client can't connect to the rabbitMQ cluster.

I had this error, my rabbitMQ server was on my computer. I resolved it by doing the following action.

On every rabbitMQ server of the cluster go to etc/rabbitmq/rabbitmq-env.conf If you have a line with NODE_IP_ADDRESS, remove it. Removing the NODE_IP_ADDRESS entry from the config binds the port to all network inferfaces.

Source : https://superuser.com/questions/464311/open-port-5672-tcp-for-access-to-rabbitmq-on-mac

7. Testing the Vert.X cluster

For example, make a Vert.X cluster with 3 nodes. Make sure you see the terminal output of Vert.X of the 3 nodes

When the messages are being read by the server, connect via ssh to this node.

Get the PID of Vert.X with the command top, it should have the name "java".

Kill the processus with kill -9 [PID]

You should see that the Vert.X application has been redeployed on another node.

See the demo of this test —> https://www.youtube.com/watch?v=VsiiOOSNfqs