Generating 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
-
Generate the private and public key pair for the nodes of the cluster leaving
the key password the same as the keystore password:
keytool -genkey -alias <cassandra_node0> -keyalg RSA -keystore .keystore
-
Repeat the previous step on each node using a different alias for each
one.
-
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
-
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
. . .
-
Make sure .keystore is readable only to the Cassandra
daemon and not by any user of the system.
