Start MySQL instance error report, view error log
## error message
2018-08-31T10:38:36.945081Z 0 [ERROR] InnoDB: The Auto-extending innodb_system data file ‘./ibdata1’ is of a different size 768 pages (rounded down to MB) than specified in the .cnf file: initial 1536 pages, max 0 (relevant if non-zero) pages!
Settlement process:
768/64=12
View the my.cnf file will
innodb_data_file_path = ibdata1:24M:autoextend
Change to
innodb_data_file_path = ibdata1:12M:autoextend
Start again!