You must change the variable log_bin_trust_function_creators to 1 during Ranger installation.

From RDS Dashboard>Parameter group (on the left side of the page):

1. Set the MySQL Server variable log_bin_trust_function_creators to 1.
2. (Optional) After Ranger installation is complete, reset log_bin_trust_function_creators to its original setting. The variable is only required to be set to 1 during Ranger installation.

For more information, see:

• Stratalux: Why You Should Always Use a Custom DB Parameter Group When Creating an RDS Instance
• AWS Documentation>Amazon RDS DB Instance Lifecycle » Working with DB Parameter Groups
• MySQL 5.7 Reference Manual >Binary Logging of Stored Programs