阿里云服务器Ubuntu上遇到的问题

1.默认安装的mysql不能连接127.0.0.1

1.错误实例

mysql -h 127.0.0.1 -u root -p
Enter password: 
ERROR 1698 (28000): Access denied for user 'root'@'localhost'

2.解决方案

停止mysql服务

sudo service mysql stop

以安全模式启动mysql

sudo mysqld_safe --skip-grant-tables & sudo service mysql start

直接不用密码登录

mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.10 MySQL Community Server (GPL)

查看一下user表，错误的起因就是在这里， root的plugin被修改成了auth_socket，用密码登陆的plugin应该是mysql_native_password。

mysql> select user, plugin from mysql.user;
+-----------+-----------------------+
| user      | plugin                |
+-----------+-----------------------+
| root      | auth_socket           |
| mysql.sys | mysql_native_password |
| dev       | mysql_native_password |
+-----------+-----------------------+
3 rows in set (0.01 sec)

设置root的plugin

mysql> update mysql.user set authentication_string=PASSWORD(''), plugin='mysql_native_password' where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

为了防止远程访问被拒绝,注释掉 bind-address 相关内容

cd /etc/mysql/mysql.conf.d
vi mysqld.cnf
# bind-address          = 127.0.0.1

重启服务

1. 方法一

sudo service mysql stop
sudo service mysql start

2. 方法二

sudo service mysql restart

再次执行 mysql -h 127.0.0.1 -u root -p

mysql -h 127.0.0.1 -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.10 MySQL Community Server (GPL)

未完待续