我们配置wordpress的时候常犯这样的错误：改了域名才发现域名还没解析过来，用自动生成的密码却忘了保存。
这时候，我们需要更改域名或修改wordpress登录密码。
修改登录密码
登上数据库，如果mysql不能登录可以使用mysql -u username -p账号密码可以在WP根目录wp-config.php中找到。
root@ubuntu:~# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 25
Server version: 5.7.21-0ubuntu0.16.04.1 (Ubuntu)
Copyright (c) 2000, 2018, 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.
显示所有的数据库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| wp1719884 |
+--------------------+
5 rows in set (0.00 sec)
选择wordpress的数据库，我的是wp1719884
mysql> use wp1719884 ;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
显示这个数据库下的表
mysql> show tables;
+-----------------------+
| Tables_in_wp1719884 |
+-----------------------+
| wp_commentmeta |
| wp_comments |
| wp_hermit |
| wp_hermit_cat |
| wp_links |
| wp_options |
| wp_postmeta |
| wp_posts |
| wp_term_relationships |
| wp_term_taxonomy |
| wp_termmeta |
| wp_terms |
| wp_usermeta |
| wp_users |
+-----------------------+
14 rows in set (0.00 sec)
显示wp_users这个表的具体信息
mysql> desc wp_users;
+---------------------+---------------------+------+-----+---------------------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------------+---------------------+------+-----+---------------------+----------------+
| ID | bigint(20) unsigned | NO | PRI | NULL | auto_increment |
| user_login | varchar(60) | NO | MUL | | |
| user_pass | varchar(255) | NO | | | |
| user_nicename | varchar(50) | NO | MUL | | |
| user_email | varchar(100) | NO | MUL | | |
| user_url | varchar(100) | NO | | | |
| user_registered | datetime | NO | | 0000-00-00 00:00:00 | |
| user_activation_key | varchar(255) | NO | | | |
| user_status | int(11) | NO | | 0 | |
| display_name | varchar(250) | NO | | | |
+---------------------+---------------------+------+-----+---------------------+----------------+
10 rows in set (0.00 sec)
只需要关心user_pass这一列，这是用户fileem的密码
mysql> select *from wp_users;
+----+------------+------------------------------------+---------------+--------------------+----------+---------------------+---------------------+-------------+--------------+
| ID | user_login | user_pass | user_nicename | user_email | user_url | user_registered | user_activation_key | user_status | display_name |
+----+------------+------------------------------------+---------------+--------------------+----------+---------------------+---------------------+-------------+--------------+
| 1 | fileem | $P$BhHKJLymYSaMlcZfwXujuZQkFmkp. | fileem | yourname@mail.com | | 2018-11-10 10:19:41 | | 0 | yourname |
+----+------------+------------------------------------+---------------+--------------------+----------+---------------------+---------------------+-------------+--------------+
1 row in set (0.00 sec)
用123456替换掉原密码
mysql> UPDATE wp_users SET user_pass = MD5( '123456' ) WHERE user_login = 'fileem';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
退出，完成，密码重置为123456
mysql> quit
Bye
修改域名
在wp-config.php中，添加以下两行内容：
define('WP_HOME','http://新网址');
define('WP_SITEURL','http://新网址');
