{"id":3572,"date":"2019-11-22T08:09:32","date_gmt":"2019-11-22T08:09:32","guid":{"rendered":"https:\/\/prwatech.in\/blog\/?p=3572"},"modified":"2024-04-03T10:08:23","modified_gmt":"2024-04-03T10:08:23","slug":"multinode-cluster-setup-in-cassandra","status":"publish","type":"post","link":"https:\/\/prwatech.in\/blog\/cassandra\/cassandra-modules\/multinode-cluster-setup-in-cassandra\/","title":{"rendered":"MultiNode Cluster Setup in Cassandra"},"content":{"rendered":"

Setting up Cassandra Multi-node Cluster<\/span><\/h2>\n

Prerequisites:<\/strong><\/h3>\n

As you\u2019re about to create a multi-node Cassandra cluster, you must identify how many servers you\u2019d like to have in your cluster and configure each of them.<\/p>\n

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It is recommended, but not required, to have the same or similar specifications.<\/p>\n

To complete this tutorial, you\u2019ll need following prerequisites:<\/p>\n

You need at least two Ubuntu 14.04 servers configured using this initial setup guide.<\/p>\n

Every server must be secured with a firewall using this IPTables guide.<\/p>\n

Every server must also have Cassandra installed by following this Cassandra installation guide.<\/p>\n

Step 1 \u2014 Deleting Default Data<\/strong><\/h3>\n

Servers in a Cassandra cluster are called as nodes.<\/p>\n

What you have on every server right now is a single-node Cassandra cluster. In this step, we will set up nodes to function as a multi-node Cassandra cluster.<\/p>\n

All the commands in this and subsequent steps must be repeated over every node in the cluster, so be sure to have as many terminals open as you have nodes in the cluster.<\/p>\n

The first command you\u2019ll run on every node will stop the Cassandra daemon.<\/p>\n

sudo service Cassandra stop<\/p>\n

When that\u2019s completed, delete the default dataset.<\/p>\n

sudo rm -rf \/var\/lib\/cassandra\/data\/system\/*<\/p>\n

Step 2 \u2014 Configuring the Cluster<\/strong><\/p>\n

Go to\u00a0 cassandra.yaml file placed in the bin directory of the setup folder.<\/p>\n

Only the following directives are required to be modified to set up a multi-node Cassandra cluster:<\/p>\n

cluster_name: It\u2019s the name of your cluster.<\/p>\n

Note: All the nodes in your cluster need to have exactly the same name.<\/p>\n

seeds: This is a comma-delimited list of the IP address of every node in your cluster.<\/p>\n

listen_address: This is IP address which other nodes in the cluster will use to connect to this one. By defaults its localhost and needs changed to the IP address of the node.<\/p>\n

rpc_address: This is IP address for remote procedure calls. It defaults to localhost. If server\u2019s hostname is properly configured, leave this as is. Otherwise, change to server\u2019s IP address or the loopback address (127.0.0.1).<\/p>\n

endpoint_snitch: Name of snitch, which is what tells Cassandra about what its network looks like. T<\/p>\n

Step 3 \u2014 Configuring the Firewall<\/strong><\/h3>\n

At this point, the cluster has been configured, but nodes are not communicating. Here, we\u2019ll configure the firewall to allow Cassandra traffic.<\/p>\n

First, restart Cassandra daemon on every node.<\/p>\n

sudo service cassandra start<\/p>\n

If you need to check status of cluster, you\u2019ll find that only the local node is listed, because it\u2019s not yet able to communicate with the other nodes.<\/p>\n

sudo nodetool status<\/p>\n

IN order to allow communication, we need to open the following network ports for every node:<\/p>\n