SSL

When the secure Flink cluster is required, SSL-related configuration items must be set.

Configuration items include the SSL switch, certificate, password, and encryption algorithm.

**Table 1** Parameters
Parameter	Description	Default Value	Mandatory
security.ssl.enabled	Main switch of internal communication SSL.	The value is automatically configured according to the cluster installation mode. Security mode: The default value is true. Non-security mode: The default value is false.	Yes
security.ssl.keystore	Java keystore file.	-	Yes
security.ssl.keystore-password	Password used to decrypt the keystore file.	-	Yes
security.ssl.key-password	Password used to decrypt the server key in the keystore file.	-	Yes
security.ssl.truststore	truststore file containing the public CA certificates.	-	Yes
security.ssl.truststore-password	Password used to decrypt the truststore file.	-	Yes
security.ssl.protocol	SSL transmission protocol version.	TLSv1.2	Yes
security.ssl.algorithms	Supported SSL standard algorithm. For details, see the Java official website: http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html#ciphersuites.	The default value: "TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384"	Yes