MySQL登陸問題總結
想在自己的小本上練習一下MySQL，結果登陸就有問題，折騰了半個小時終於搞定，也把這幾個常見的問題總結下來和大家分享。筆者的系統是OpenSuSE，其他系統的解決方式類似，供大家參考。
首先，登陸MySQL，提示ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysql/mysql.sock' (2)，ps後感覺mysqld是啟動的呀
[plain]
atom@openSuSE:~> mysql -u root -h localhost -p
Enter password: www.2cto.com
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysql/mysql.sock' (2)
atom@openSuSE:~> ps aux | grep mysql
atom 1842 0.0 1.0 265564 41296 ? Sl 09:15 0:00 /usr/sbin/mysqld --defaults-file=/home/atom/.local/share/akonadi//mysql.conf --datadir=/home/atom/.local/share/akonadi/db_data/ --socket=/home/atom/.local/share/akonadi/socket-openSuSE.site/mysql.socket
atom 2788 0.0 0.0 8276 876 pts/0 S+ 09:25 0:00 grep --color=auto mysql
但是，查看mysqld的狀態，發現Active: inactive (dead)。。。
[plain]
atom@openSuSE:~> /etc/init.d/mysql status
redirecting to systemctl
mysql.service - LSB: Start the MySQL database server
Loaded: loaded (/etc/init.d/mysql)
Active: inactive (dead)
CGroup: name=systemd:/system/mysql.service
那就再啟動一次，觀察mysql的狀態。
[plain]
atom@openSuSE:~> sudo /etc/init.d/mysql restart
redirecting to systemctl www.2cto.com
atom@openSuSE:~> ps aux | grep mysql
atom 1842 0.0 1.0 265564 41296 ? Sl 09:15 0:00 /usr/sbin/mysqld --defaults-file=/home/atom/.local/share/akonadi//mysql.conf --datadir=/home/atom/.local/share/akonadi/db_data/ --socket=/home/atom/.local/share/akonadi/socket-openSuSE.site/mysql.socket
root 22000 0.0 0.0 11536 1644 ? S 09:32 0:00 /bin/sh /usr/bin/mysqld_safe --mysqld=mysqld --user=mysql --pid-file=/var/run/mysql/mysqld.pid --socket=/var/run/mysql/mysql.sock --datadir=/var/lib/mysql
mysql 22322 0.2 1.0 721584 42540 ? Sl 09:32 0:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/log/mysql/mysqld.log --pid-file=/var/run/mysql/mysqld.pid --socket=/var/run/mysql/mysql.sock --port=3306
atom 22359 0.0 0.0 8276 872 pts/0 S+ 09:33 0:00 grep --color=auto mysql
atom@openSuSE:~> /etc/init.d/mysql status
redirecting to systemctl
mysql.service - LSB: Start the MySQL database server
Loaded: loaded (/etc/init.d/mysql) www.2cto.com
Active: active (running) since Mon, 18 Jun 2012 09:32:43 +0800; 3min 32s ago
Process: 21865 ExecStart=/etc/init.d/mysql start (code=exited, status=0/SUCCESS)
CGroup: name=systemd:/system/mysql.service
├ 22000 /bin/sh /usr/bin/mysqld_safe --mysqld=mysqld --user=mysql --pid-file=/var/run/mysql/mysqld.pid --socket=...
└ 22322 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mys...
這下總算正常了，再嘗試登陸又給出錯誤提示：ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)。
在網上查到一種解決方案，供大家參考。首先，關閉mysqld服務，然後執行下面兩條命令，總算可以進去了，先改密碼~
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atom@openSuSE:~> sudo /etc/init.d/mysql stop
root's password: www.2cto.com
redirecting to systemctl
atom@openSuSE:~> sudo mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
[1] 22638
atom@openSuSE:~> 120618 09:40:32 mysqld_safe Logging to '/var/log/mysql/mysqld.log'.
120618 09:40:32 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
atom@openSuSE:~> mysql -u root mysql
[sql]
mysql> UPDATE user SET Password=PASSWORD('xxxx') where USER='root';
mysql> FLUSH PRIVILEGES;
mysql> quit
把PASSWORD('xxxx')中xxxx替換為你自己的密碼。重啟一次，使用設置的新密碼就可以進去了。
作者 nevasun
