//报错

ERROR 2003 (HY000): Can't connect to MySQL server on'localhost'(111)'

1)更改配置，此处可以跳过密码设置

vi /etc/my.cnf

#在mysqld模块下添加

skip-grant-tables

// password 函数在MySQL8中位置，以下步骤未实现

2)重启服务：

systemctl restart mysqld

3) 按照传统改密码方式发现没有 password这个字段。

mysql> update user set password=password('123') where user='root';

ERROR 1054 (42S22): Unknown column 'password' in 'field list'

网上查了一下据说5.7 版本password 字段改成authentication_string password函数未知

mysql> update user set authentication_string=password('123') where user='root';

Query OK, 1 row affected, 1 warning (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 1

user 表的管理字段

+--------------------------+-----------------------------------+------+-----+-----------------------+-------+

| Field | Type | Null | Key | Default | Extra |

+--------------------------+-----------------------------------+------+-----+-----------------------+-------+

| Host | char(255) | NO | PRI | | |

| User | char(32) | NO | PRI | | |

| Select_priv | enum('N','Y') | NO | | N | |

| Insert_priv | enum('N','Y') | NO | | N | |

| Update_priv | enum('N','Y') | NO | | N | |

| Delete_priv | enum('N','Y') | NO | | N | |

| Create_priv | enum('N','Y') | NO | | N | |

| Drop_priv | enum('N','Y') | NO | | N | |

| Reload_priv | enum('N','Y') | NO | | N | |

| Shutdown_priv | enum('N','Y') | NO | | N | |

| Process_priv | enum('N','Y') | NO | | N | |

| File_priv | enum('N','Y') | NO | | N | |

| Grant_priv | enum('N','Y') | NO | | N | |

| References_priv | enum('N','Y') | NO | | N | |

| Index_priv | enum('N','Y') | NO | | N | |

| Alter_priv | enum('N','Y') | NO | | N | |

| Show_db_priv | enum('N','Y') | NO | | N | |

| Super_priv | enum('N','Y') | NO | | N | |

| Create_tmp_table_priv | enum('N','Y') | NO | | N | |

| Lock_tables_priv | enum('N','Y') | NO | | N | |

| Execute_priv | enum('N','Y') | NO | | N | |

| Repl_slave_priv | enum('N','Y') | NO | | N | |

| Repl_client_priv | enum('N','Y') | NO | | N | |

| Create_view_priv | enum('N','Y') | NO | | N | |

| Show_view_priv | enum('N','Y') | NO | | N | |

| Create_routine_priv | enum('N','Y') | NO | | N | |

| Alter_routine_priv | enum('N','Y') | NO | | N | |

| Create_user_priv | enum('N','Y') | NO | | N | |

| Event_priv | enum('N','Y') | NO | | N | |

| Trigger_priv | enum('N','Y') | NO | | N | |

| Create_tablespace_priv | enum('N','Y') | NO | | N | |

| ssl_type | enum('','ANY','X509','SPECIFIED') | NO | | | |

| ssl_cipher | blob | NO | | NULL | |

| x509_issuer | blob | NO | | NULL | |

| x509_subject | blob | NO | | NULL | |

| max_questions | int(11) unsigned | NO | | 0 | |

| max_updates | int(11) unsigned | NO | | 0 | |

| max_connections | int(11) unsigned | NO | | 0 | |

| max_user_connections | int(11) unsigned | NO | | 0 | |

| plugin | char(64) | NO | | caching_sha2_password | |

| authentication_string | text | YES | | NULL | |

| password_expired | enum('N','Y') | NO | | N | |

| password_last_changed | timestamp | YES | | NULL | |

| password_lifetime | smallint(5) unsigned | YES | | NULL | |

| account_locked | enum('N','Y') | NO | | N | |

| Create_role_priv | enum('N','Y') | NO | | N | |

| Drop_role_priv | enum('N','Y') | NO | | N | |

| Password_reuse_history | smallint(5) unsigned | YES | | NULL | |

| Password_reuse_time | smallint(5) unsigned | YES | | NULL | |

| Password_require_current | enum('N','Y') | YES | | NULL | |

| User_attributes | json | YES | | NULL | |

+--------------------------+-----------------------------------+------+-----+-----------------------+-------+

51 rows in set (0.01 sec)

4.更改配置重启

[root@master1 ~]# vi /etc/my.cnf

注释 # skip-grant-tables

[root@master1 ~]# systemctl restart mysqld

[root@master1 ~]# mysql -uroot -p123

5.成功：

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