$ sudo su
remove cassandra
$ apt-get remove cassandra
cleaned the cassandra folders
$ rm -rf /var/lib/cassandra
$ rm -rf /var/log/cassandra
$ rm -rf /etc/cassandra
Add the DataStax Community repository to the /etc/apt/sources.list.d/cassandra.sources.list
$ echo "deb http://debian.datastax.com/community stable main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
Add the DataStax repository key to your aptitude trusted keys.
$ curl -L https://debian.datastax.com/debian/repo_key | sudo apt-key add -
If the above doesn’t work try:
curl -L http://debian.datastax.com/debian/repo_key | sudo apt-key add -
And then
sudo apt-get update and then sudo apt-get install cassandra
This is the configuration file cassandra reads at startup
$ sudo vi /etc/cassandra/cassandra.yaml
Change authenticator: AllowAllAuthenticator
to authenticator: PasswordAuthenticator
Bring up cassandra when system boots up
$ sudo update-rc.d cassandra enable
use $ cassandra command to enable the cassandra service
then login with following command and you will be able to add new user and create schema:
cqlsh -u cassandra -p cassandra
Create kespace and user
create keyspace rainbowdba with replication = { ‘class‘ : ‘SimpleStrategy‘, ‘replication_factor‘ : 1 };
CREATE USER OC_APP_RAINBOWDBA WITH PASSWORD ‘0b6e8c45df68f6f16d1c494c6ba443c0‘;
ALTER USER OC_APP_RAINBOWDBA WITH PASSWORD ‘a3c224d4b89192d2ea3ea943dd7e9648‘; (may change USER to ROLE)
3) Create the schema accordingly
原文：http://www.cnblogs.com/codingforum/p/6832024.html