##正确方法，指定通信协议 --protocol tcp
[root@mysql01 ~]# /opt/mysql/bin/mysql -uroot -h localhost -P 3307 -p --protocol tcp
Enter password:
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Your MySQL connection id is 8
Server version: 5.6.31-log Source distribution
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原文：https://blog.51cto.com/accole/2468277