In previous article we came across how to install and run a single node Cassandra cluster in Ubuntu. In this article we will come across how to setup a multi-node cluster on Ubuntu.

We will try to create a cluster using 5 different machines to make a ring of 5 nodes.

Now our 5 machines nodes have address as follows:
10.62.200.31
10.62.200.32
10.62.200.33
10.62.200.34
10.62.200.35

Apache Cassandra Multiple Node cluster

For production environments we strongly recommend to use a multi-node cluster, that is what Cassandra actually made for. In this article we will show how to install a multi node Cassandra cluster on Linux machine.

We will create two seed nodes among these 5 and will start them first so that they can seed to other nodes joining the cluster, steps are as follows:

Step1:

Install Java 8+ on each and every now, we will have a cluster of Cassandra 3 and that requires Java 8+. Make sure you have a running Java on each node as follows:

java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

If Java is not installed please follow this link to install Java first: Install Java on Ubuntu.

Step2:

Download and extract Cassandra distribution package in any folder of your choice, as follows:

mkdir cassandra
cd cassandra
wget http://www.eu.apache.org/dist/cassandra/3.0.0/apache-cassandra-3.0.0-bin.tar.gz

You should see somwthing like this, indicating that the file is being downloaded:

--2015-11-22 00:49:25-- http://www.eu.apache.org/dist/cassandra/3.0.0/apache-cassandra-3.0.0-bin.tar.gz
Resolving www.eu.apache.org (www.eu.apache.org)... 88.198.26.2, 2a01:4f8:130:2192::2
Connecting to www.eu.apache.org (www.eu.apache.org)|88.198.26.2|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 30706232 (29M) [application/x-gzip]
Saving to: "apache-cassandra-3.0.0-bin.tar.gz"

Unzip the downloaded file with following command:

tar -xvzf apache-cassandra-3.0.0


Step 3:

Configuration for seed nodes, listen_address and rpc_address on cassandra.yaml file Open cassandra.yaml file in each node and change following entries:

vim apache-cassandra-3.0.0/conf/cassandra.yaml

cluster_name: 'MyFirstCluster'
seeds: "10.62.200.31, 10.62.200.32"
listen_address: 10.62.200.31
rpc_address: 10.62.200.31

Make sure that, seeds and cluster_name will be same for each node and listen_address, rpc_address will be the ip of particular node.

Step 4:

Start the cluster and verify First of all seed nodes should be started so that they can seed to other nodes coming to join the cluster:

cd apache-cassandra-3.0.0/bin/
sudo sh cassandra

Now start all the nodes using same command. To verify the cluster go to any of the node and supply following command:

cd apache-cassandra-3.0.0/bin/
./nodetool status

This should show following outup to display the cluster status:

Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 10.62.200.31 142.04 KB 256 ? e97a6709-3216-43af-90de-5a3017761a46 rack1
UN 10.62.200.32 142.04 KB 256 ? e97a6709-3216-43af-90de-5a3017761a46 rack1
UN 10.62.200.33 127.83 KB 256 ? 6f74e3f8-4f20-43d8-90ff-5439939f5159 rack1
UN 10.62.200.34 137.89 KB 256 ? 8bd7390d-dde8-4aaa-8a44-73981e698a05 rack1
UN 10.62.200.35 161.07 KB 256 ? cf967b8c-4187-46d3-a464-fff09c28bb0d rack1

That's it, we are here done with creating a multiple mode Cassandra cluster with 5 nodes, out of them 2 are seed nodes.
  • By Techburps.com
  • Nov 22, 2015
  • Cassandra