Running Cassandra Multinode Cluster

[2 Nodes & 1 Datacenter]

Reference links

1. Install Cassandra on all Nodes as follows:

  echo "deb http://www.apache.org/dist/cassandra/debian 311x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
  curl https://www.apache.org/dist/cassandra/KEYS | sudo apt-key add -
  sudo apt-get update

  sudo apt-get install cassandra -y

You can start Cassandra with sudo service cassandra start
Stop it with sudo service cassandra stop

Normally the service will start automatically. For this reason be sure to stop it if you need to make any configuration changes.

Verify that Cassandra is running by invoking nodetool status from the command line.

nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens       Owns    Host ID                               Rack
UN  127.0.0.1  172.18 KiB  256          ?       60bc1910-eb04-4c7f-bc44-4de3643ce4f4  rack1

Note: Non-system keyspaces don't have the same replication settings, effective ownership information is meaningless

The default location of configuration files is /etc/cassandra.
The default location of log and data directories is /var/log/cassandra/ and /var/lib/cassandra.
Start-up options (heap size, etc) can be configured in /etc/default/cassandra.

1. Stop Cassandra-daemon-

sudo service cassandra stop

2. Delete the default dataset:

sudo rm -rf /var/lib/cassandra/data/system/*

3. Edit the cassandra.yaml file as follows-

sudo vim /etc/cassandra/cassandra.yaml

4. The contents should look like the below:

  cluster_name: 'CassandraDOCluster'

  seed_provider:
    - class_name: org.apache.cassandra.locator.SimpleSeedProvider
      parameters:
           - seeds: "your_server_ip,your_server_ip_2,...your_server_ip_n"

  listen_address: your_server_ip

  rpc_address: your_server_ip

  endpoint_snitch: GossipingPropertyFileSnitch

at the end of the cassandra.yaml file add the following : auto_bootstrap: false

edit the file below sudo vim /etc/cassandra/cassandra-env.sh
- search for hostname and place your IP address in it

5. Restart the cassandra-daemon

sudo service cassandra start

sudo service cassandra restart

6. Check status of the cluster

sudo nodetool status sudo nodetool status <keyspace-name> (if the keyspaces don't have the same replication factor)

Output

  Datacenter: dc1
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens       Owns (effective)  Host ID                               Rack
UN  172.31.86.204  456.99 MiB  256          23.6%             c03141fc-ae28-4d4c-b658-cb949e5ccc57  rack1
UN  172.31.90.24   107.44 KiB  256          27.5%             8c143d7a-69d2-48c1-8a23-dcda6ce9dfa5  rack1

8. Modify the firewall rules

sudo vim /etc/iptables/rules.v4

9. New firewall rule should be as follows

-A INPUT -p tcp -s your_other_server_ip -m multiport --dports 7000,9042 -m state --state NEW,ESTABLISHED -j ACCEPT

10. Restart ip-tables

sudo service iptables-persistent restart

11. Check cluster status

sudo nodetool status

12. use cqlsh as follows

cqlsh your_server_ip 9042

Multi Node Setup I