Apache Cassandra™ 2.0

Preparing server certificates

Generate SSL certificates for client-to-node encryption or node-to-node encryption.

If you generate the certificates for one type of encryption, you do not need to generate them again for the other: the same certificates are used for both.

All nodes must have all the relevant SSL certificates on all nodes. A keystore contains private keys. The truststore contains SSL certificates for each node and doesn't require signing by a trusted and recognized public certification authority.

Procedure

  1. Generate the private and public key pair for the nodes of the cluster.

    A prompt for the new keystore and key password appears.

  2. Leave key password the same as the keystore password.
  3. Repeat steps 1 and 2 on each node using a different alias for each one.
    keytool -genkey -alias <cassandra_node0> -keystore .keystore
    
  4. Export the public part of the certificate to a separate file and copy these certificates to all other nodes.
    keytool -export -alias cassandra -file cassandranode0.cer -keystore .keystore
    
  5. Add the certificate of each node to the truststore of each node, so nodes can verify the identity of other nodes.
    keytool -import -v -trustcacerts -alias <cassandra_node0> -file <cassandra_node0>.cer -keystore .truststore
    keytool -import -v -trustcacerts -alias <cassandra_node1> -file <cassandra_node1>.cer -keystore .truststore
    . . .
    
  6. Distribute the .keystore and .truststore files to all Cassandra nodes.
  7. Make sure .keystore is readable only to the Cassandra daemon and not by any user of the system.