Docker MySQLで日本語入力できない時

mysql> show variables like ‘char%’;
+————————–+—————————-+
| Variable_name | Value |
+————————–+—————————-+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | latin1 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+————————–+—————————-+
8 rows in set (0.12 sec)

docker-compose.yml

  db:
    build: ./db
    env_file: .env
    ports:
      - "3306:3306"
    volumes:
      - db-data:/var/lib/mysql
      - ./db/initial.sql:/docker-entrypoint-initdb.d/initial.sql
    command: mysqld --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

./db/my.cnf

[mysql]
default-character-set=utf8mb4
[mysqld]
character-set-server=utf8mb4
collation-server=utf8mb4_bin
[client]
default-character-set=utf8mb4

./db/Dockerfile

FROM mysql:5.7.19

ADD ./my.cnf /etc/mysql/my.cnf

RUN chmod 644 /etc/mysql/my.cnf

$ sudo docker-compose build
$ sudo docker-compose up -d
$ sudo docker exec -it 325 bash
# mysql -u root -p
mysql> show variables like ‘char%’;
+————————–+—————————-+
| 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 | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+————————–+—————————-+

$ sudo apt-get update
$ apt-get install locales locales-all
$ dpkg-reconfigure locales
275. ja_JP.UTF-8 UTF-8 & 3
$ apt-get install vim

$ export LANG=ja_JP.UTF-8
$ vim ~/.bashrc

$ vim ~/.inputrc

set convert-meta off
set meta-flag on
set output-meta on

$ source ~/.inputrc

これで、Docker mysqlの日本語入力が可能となりました。
やばすぎるな、これ。