how to set the charset when i created database

[YoungCh322]

when i create a database like this
"docker run -d --name mysql -e MYSQL_USER=user -e MYSQL_PASSWORD=pass -e MYSQL_DATABASE=db -e MYSQL_CHAR_SET=utf8 -e MYSQL_COLLATION=utf8_unicode_ci -p 3306:3306 rhscl/mysql-57-rhel7"

but the character_set_database and character_set_server is still latin1...
what should i do to solve this