docker使用 mysql8

# docker pull mysql:8

# mkdir -p /mysql/{datadir,etc/mysql}

# cat >/mysql/etc/mysql/my.cnf <<EOF
[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= NULL
symbolic-links=0
default_authentication_plugin=mysql_native_password
EOF

# docker run -d --name mysql -v /mysql/datadir:/var/lib/mysql -v /mysql/etc/mysql/my.cnf:/etc/mysql/my.cnf -p 3306:3306 -e MYSQL_ROOT_PASSWORD=123456 mysql:8

使用mysql客户端连接提示： cannot be loaded: /usr/lib/x86_64-linux-gnu/mariadb18/plugin/caching_sha2_password.so
解决办法，执行：

   # docker exec -it mysql /bin/sh
   # mysql -uroot -p
   mysql> use mysql
   mysql> alter user 'root'@'%' identified by 'password' password expire never；
   mysql> alter user 'root'@'%' identified with mysql_native_password by '123456';
   mysql> flush privileges;

再次登录，就正常了：
mysql -uroot -h127.0.0.1 -p123456