mysql configuration to avoid Docker error like " Aborted connection 6 to db: 'db' user: 'root' host: '172.18.0.5' (Got an error reading communication packets)"

custom-mysql.cnf

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
max_allowed_packet = 1073741824
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci

Dockerfile

#### after the above custom my.cnf, add this at the Dockerfile
FROM mysql:latest
COPY ./custom-mysql.cnf /etc/mysql/conf.d/