Mysql 整理错误

Mysql 启动报PID错误

Starting MySQL..ERROR! The server quit without updating PID file (/usr/local/mysql/data/localhost.localdomain.pid).

　　[root@localhost ~]# cd /usr/local/mysql

　　[root@localhost mysql]# chown -R mysql.mysql .

　　[root@localhost mysql]# su - mysql

　　[mysql@localhost ~]$ cd /usr/local/mysql

　　[mysql@localhost mysql]$ scripts/mysql_install_db

# 将PID所在路径,权限设置777
chomod 777 /data/mysql

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Mysql 登陆验证错误

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

方法操作很简单，如下：

/etc/init.d/MySQL stop

mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

mysql -u root mysql

mysql>use mysql ;

mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root' and host='root' or host='localhost';//把空的用户密码都修改成非空的密码就行了。

mysql> FLUSH PRIVILEGES;

mysql> quit # /etc/init.d/mysqld restart

mysql -uroot -p

Enter password: <输入新设的密码newpassword>
 

# 1、修改配置文件
vim /etc/my.cnf
# 无需验证mysql登陆
skip-grant-tables

# 2、重启mysql
/etc/init.d/mysqld restart

# 3、进入mysql修改root密码
mysql> use mysql;
mysql> update user set password=password("你的新密码") where user="root";
mysql> flush privileges;
mysql> quit

# 4、去除配置文件skip-grant-tables字段、重启
/etc/init.d/mysqld restart

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Mysql 反解析登陆错误

Lost connection to Mysql server at 'waiting for initial communication packet'

# my.cnf配置的几个参数：
skip-name-resolve           跳过DNS反向解析过程.（这样就不能使用主机名连接mysql了，只能使用ip连接）
skip-grant-tables           跳过授权表（当mysql登陆密码忘记时的解决办法）
skip-networking             跳过TCP/IP连接
skip-host-cache             禁用主机名缓存;要想清除主机名缓存，执行FLUSH HOSTS语句或执行mysqladmin flush-

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