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where advertised.listeners is the second parameter (after node.id) that is unique to each server node.

log.dirs specifies not the location of server logs (that is in <kafkaInstallationDir/logs>, but actual topic data, so provide a reliable location outside the default /tmp; for example /var/opt/kafka. 

SASL_SSL on the broker listener is required to enforce client/server user authentication and authorization since that traffic is traversing the public internet. SASL_SSL may also be enabled for the controller listener with properly configured keystores and truststores; however if the server nodes communicate exclusively in private network space (as described above), then SASL_PLAINTEXT may be considered sufficient.

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log.dirs specifies not the location of server logs (that is in <kafkaInstallationDir/logs>, but actual topic data, so provide a reliable location outside the default /tmp; for example /var/opt/kafka. 

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Set the SASL mechanism parameters to PLAIN:

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