sh-4.4# mysql -uroot -p
Enter password: 
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Your MySQL connection id is 13
Server version: 8.1.0 MySQL Community Server - GPL

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mysql> show variables like "chara%";
+--------------------------+--------------------------------+
| Variable_name            | Value                          |
+--------------------------+--------------------------------+
| character_set_client     | utf8mb4                        |
| character_set_connection | utf8mb4                        |
| character_set_database   | utf8mb4                        |
| character_set_filesystem | binary                         |
| character_set_results    | utf8mb4                        |
| character_set_server     | utf8mb4                        |
| character_set_system     | utf8mb3                        |
| character_sets_dir       | /usr/share/mysql-8.1/charsets/ |
+--------------------------+--------------------------------+
8 rows in set (0.00 sec)

mysql> 

command: ['mysqld', '--character-set-server=utf8mb4', '--collation-server=utf8mb4_bin','--default-time-zone=+09:00']