Cassandra 3 Node Cluster Setup Notes


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Install on each node

wget http://www-eu.apache.org/dist/cassandra/redhat/30x/cassandra-3.0.13-1.noarch.rpm
yum install jre
rpm -ivh cassandra-3.0.13-1.noarch.rpm
chkconfig cassandra on

Configuration changes on each node

vi /etc/cassandra/conf/cassandra.yaml

Customise the seeds / ip address for your environment

cluster_name: 'cassandra_cluster'
seeds: "192.168.65.120,192.168.65.121,192.168.65.122"
listen_address: 
rpc_address: 


Start the cassandra service on each node

service cassandra start
service cassandra status

If you get the following error;

org.apache.cassandra.exceptions.ConfigurationException: Saved cluster name Test Cluster != configured name cassandra_cluster

Then you need to reset the data folder (note this removes all data so take a backup if you're not sure).


rm -rf /var/lib/cassandra/data/system/*
service cassandra start
View the status of the cluster
nodetool status
Output will be similar to below;
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address         Load       Tokens       Owns (effective)  Host ID                               Rack
UN  192.168.65.120  108.04 KB  256          65.8%             92119740-cbf7-406a-9237-a1f4036e26e9  rack1
UN  192.168.65.121  166.99 KB  256          65.6%             13b5a4f8-6d98-481b-809e-f1a2ffd8ae94  rack1
UN  192.168.65.122  143.53 KB  256          68.6%             fe0068b2-2dca-403a-b5f2-93e827250bc5  rack1

Login with the command-line client

export CQLSH_HOST=$(hostname --ip-address)
cqlsh

Do some stuff;

cqlsh> CREATE KEYSPACE rhys WITH REPLICATION = {'class':'SimpleStrategy','replication_factor':2};
cqlsh> USE rhys;
cqlsh> CREATE TABLE rhys (empid int primary key, emp_first varchar, emp_last varchar, emp_dept varchar);
cqlsh> INSERT INTO rhys (empid, emp_first, emp_last, emp_dept) VALUES (1, 'Rhys', 'Campbell', 'ENT');

Enable authentication on each node

vi /etc/cassandra/conf/cassandra.conf

Change the option in this file on each node;

authenticator: PasswordAuthenticator

Restart each node;

service cassandra restart

Login to one node to update the cassandra admin user;

export CQLSH_HOST=$(hostname --ip-address)
cqlsh -u cassandra -p cassandra

Alter the replication factor for the system_auth namespace;

cqlsh> ALTER KEYSPACE "system_auth" WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 'datacenter1': 3 };

Ensure the change is propogated through the system;

nodetool repair system_auth

Restart;

service cassandra restart

Create a new superuser

cqlsh -u cassandra -p cassandra
csqlsh> CREATE ROLE admin WITH PASSWORD = 'BigSecret' AND SUPERUSER = true AND LOGIN = true;
exit

Change the default user;

cqlsh -u ucid_admin -p BigSecret
cqlsh> ALTER ROLE cassandra WITH PASSWORD='xfvasdfvsxv3456456uyhnfdfgu657rt87ytygwe3456' AND SUPERUSER=false;

Change some settings to update the system roles;

vi /etc/cassandra/conf/cassandra.conf

Set to ten minutes refresh 5

roles_validity_in_ms: 600000
roles_update_interval_in_ms: 300000

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