# 进入容器 查看字符集
[root@master2 ~]# docker exec -it b18f56aa1e15 /bin/bash
root@b18f56aa1e15:/# locale
LANG=
LANGUAGE=
LC_CTYPE="POSIX"
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=
# 查看容器支持的字符集
root@b18f56aa1e15:/# locale -a
C
C.UTF-8
POSIX

[root@master2 ~]# docker exec -it b18f56aa1e15 env LANG=C.UTF-8 /bin/bash
root@b18f56aa1e15:/# 你好
root@b18f56aa1e15:/# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 80
Server version: 5.7.17-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> 你好