MySQL ‘root‘@‘localhost‘無法登錄
#mysql -u root -p
提示”Access denied for user ‘root’@’localhost’ (using password: YES)”
因為年後有同事離職，我第一反應是誰修改了root密碼？按照忘記root密碼來重置一下密碼：
#/etc/init.d/mysql stop
#mysqld_safe –skip-grant-tables &
#mysql -uroot -p
mysql>update mysql.user set password=password(‘mypassword’) where user=’root’;
mysql>flush privileges;
mysql>quit
用新密碼還是無法登錄，提示跟上面一樣。換一個非root賬號登錄，查看一下user表：
mysql> select user,host from user;
+———–+———+
| user | host |
+———–+———+
| root | 127.0.0.1 |
| night | % |
+———–+———+
懷疑默認的localhost沒有映射到127.0.0.1？試試#mysql -u root -p xxxx -h 127.0.0.1，果然可以登錄。
之前配置數據庫的同學沒有給’root’@’localhost’和’root’@’ip’授權。
grant all privileges on . to ‘root’@’localhost’ identified by ‘mypassword’ with grant option;
grant all privileges on . to ‘root’@’118.192.91.xxx’ identified by ‘mypassword’ with grant option;
再查詢一下用戶表：
這裏寫圖片描述
然後#mysql -u root -p xxxx，登錄成功！
查了一下mysql -h localhost和mysql -h 127.0.0.1的區別，通過localhost連接到mysql是使用UNIX socket，而通過127.0.0.1連接到mysql是使用TCP/IP。看看狀態：
mysql -h localhost > status
Connection id: 639
Current database: mysql
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ”
Using delimiter: ;
Server version: 5.6.15-log Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
mysql -h 127.0.0.1 > status
Connection id: 640
Current database: mysql
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ”
Using delimiter: ;
Server version: 5.6.15-log Source distribution
Protocol version: 10
Connection: 127.0.0.1 via TCP/IP
MySQL ‘root‘@‘localhost‘無法登錄