The default password for Cassandra is Cassandra. So we need to change it immediately after we install it. We can use this command to change it.
# cqlsh `hostname` -u cassandra
Password:
Connected to xxx at xxx-xxx-xxx-2.localdomain:9042.
[cqlsh 5.0.1 | Cassandra 2.2.13 | CQL spec 3.3.1 | Native protocol v4]
Use HELP for help.
cassandra@cqlsh>
cassandra@cqlsh> ALTER USER cassandra with PASSWORD ‘xxxx#####xxxxxxx’;
cassandra@cqlsh> exit
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