Securing Spark Connections
Communication between Spark applications and transactional nodes, masters and workers, and intercommunication between Spark drivers and executors can be encrypted. Encryption must be configured individually on each node in the cluster.
Encryption between the Spark processes and DSE is configured by enabling client-to-node encryption in cassandra.yaml.
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The location of the
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Encryption between Spark applications, including between the Spark master and worker nodes, is configured by enabling Spark security in dse.yaml.
Encryption between the Spark driver and executors in client applications is configured by enabling Spark security in the application configuration properties, or by default in spark-defaults.conf and spark-daemon-defaults.conf in the Spark configuration directory.
The default location of the Spark configuration files depends on the type of installation:
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Package installations:
/etc/dse/spark/ -
Tarball installations:
<installation_location>/resources/spark/conf
Procedure
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Locate the
dse.yamlconfiguration file. The location of this file depends on the type of installation:-
Package installations:
/etc/dse/dse.yaml -
Tarball installations:
<installation_location>/resources/dse/conf/dse.yaml
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Enable mutual authentication and encryption between Spark master and worker nodes in
dse.yaml.When DSE authentication is enabled with
authentication_optionsindse.yaml, Spark security is enabled regardless of these settings.-
Enable mutual authentication by setting
spark_security_enabledtotrue. -
Enable encryption by setting
spark_security_encryption_enabledtotrue.
spark_security_enabled: true spark_security_encryption_enabled: trueTo enable encryption, you must also enable mutual authentication.
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To encrypt communication between the Spark application and master, DSE inherits the
client to cluster connection encryptionoptions. -
The Spark web UI by default uses client-to-cluster encryption settings to enable SSL security in the web interface. To enable SSL security separately from DSE client-to-cluster encryption, change the settings in
dse.yamlunderspark_ui_options. Setencryptiontocustom, then set the keystore settings inencryption_options.The Spark web UI server automatically discards all cipher algorithms that end with a suffix
SHA,SHA1orMD5. If you manually specify cipher suites for encryption, make sure the specified cipher suites are not ignored by the server and are supported by the web browsers used to access the Spark web UI. For example, two 256 bit cipher suites that are supported by both the server and current web browsers areTLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384andTLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384. -
The
AlwaysOn SQLserver can optionally use SSL to encrypt client connections. -
Restart the node to recognize the changes.
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For each Spark application, set the following client encryption options to true in the
spark-defaults.conffile to enable encryption between the Spark driver and executors.Option Description spark.authenticateEnables or disables mutual authentication using a secret key. The default is
false.spark.authenticate.enableSaslEncryptionEnables or disables SASL encryption between a Spark driver and its executors. The default is
false.spark.io.encryption.enabledEnables or disables encryption for data stored by drivers directly on disk.
To enable encryption by default for all Spark applications, modify the options in the
spark-defaults.conffile in the Spark configuration directory. To encrypt data stored on the server by default, modify the options in thespark-daemon-defaults.conffile.Option Description spark.io.encryption.enabledEnables or disables encryption for data stored by executors and shuffle services directly on disk.
