MySQL安装过程中出现的问题

1>解压缩MySQL

[html] [root@localhost test]# tar -xvf MySQL-5.6.12-2.linux_glibc2.5.i386.rpm-bundle.tar MySQL-test-5.6.12-2.linux_glibc2.5.i386.rpm MySQL-shared-5.6.12-2.linux_glibc2.5.i386.rpm MySQL-embedded-5.6.12-2.linux_glibc2.5.i386.rpm MySQL-client-5.6.12-2.linux_glibc2.5.i386.rpm MySQL-devel-5.6.12-2.linux_glibc2.5.i386.rpm MySQL-server-5.6.12-2.linux_glibc2.5.i386.rpm MySQL-shared-compat-5.6.12-2.linux_glibc2.5.i386.rpm 

2>安装MySQL

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(1) 如果已经安装了MySQL,会出现以下提示信息:

[root@localhost test]# rpm -ivh MySQL-server-5.6.12-2.linux_glibc2.5.i386.rpm Preparing... ########################################### [100%] package MySQL-server-5.6.12-2.linux_glibc2.5.i386 is already installed [root@localhost test]# rpm -ivh MySQL-client-5.6.12-2.linux_glibc2.5.i386.rpm Preparing... ########################################### [100%] package MySQL-client-5.6.12-2.linux_glibc2.5.i386 is already installed 

可以先进行卸载MySQL

使用命令rpm –e MySQL-server-5.6.12-2.linux_glibc2.5.i386.rpm –nodeps

[html] rpm –e MySQL-server-5.6.12-2.linux_glibc2.5.i386.rpm --nodeps 

(2)如果没有提示这些信息,那么会正常安装.

[html] [root@localhost test]# rpm -ivh MySQL-server-5.6.12-2.linux_glibc2.5.i386.rpm Preparing... ########################################### [100%] 1:MySQL-server ########################################### [100%] [root@localhost test]# rpm -ivh MySQL-client-5.6.12-2.linux_glibc2.5.i386.rpm Preparing... ########################################### [100%] 1:MySQL-client ########################################### [100%] 

3>启动MySQL

(1)首次启动MySQL服务器,出现异常信息的解决办法

[html] [root@localhost test]# service mysql start Starting MySQL.......................... ERROR! The server quit without updating PID file (/var/lib/mysql/localhost.pid). 

由于mysql启动的僵死进程,需要将其杀死之后方能启动

[html] [root@localhost test]# ps -ef | grep mysql root 1953 1 0 22:18 ? 00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/localhost.localdomain.pid mysql 2171 1953 0 22:18 ? 00:00:04 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/lib/mysql/localhost.localdomain.err --pid-file=/var/lib/mysql/localhost.localdomain.pid root 3282 1 0 22:37 pts/0 00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/localhost.pid mysql 3386 3282 2 22:37 pts/0 00:00:01 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/lib/mysql/localhost.err --pid-file=/var/lib/mysql/localhost.pid root 3482 2681 0 22:38 pts/0 00:00:00 grep mysql 

使用kill -9 2171之类杀死

再使用service mysql start或者/etc/init.d/mysql start

[html] [root@localhost test]# service mysql start Starting MySQL SUCCESS! 

4>登录MySQL

[html] [root@localhost test]# mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or /g. Your MySQL connection id is 2 Server version: 5.6.12 MySQL Community Server (GPL) Copyright (c) 2000, 2013, 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. 

第一次登录的密码在~/.mysql_secret中

[html] cat .mysql_secret 进入mysql之后需要设置密码,否则不能进行任何操作,如果提示ERROR 1862 (HY000): Your password has expired. To log in you mustchange it using a client that supports expired passwords. /

那么也需要重新设置密码

MySQL文档中词条MYSQL_OPT_CAN_HANDLE_EXPIRED_PASSWORDS有下面的信息

查找SET PASSWORD

为root用户设置新密码

[html] set password for ‘root’@’localhost’=password(‘root’) 

之后可以进行正常的操作

忘记mysql root密码的解决方法

一. MySQL密码的恢复方法之一

如果忘记了MySQL的root密码，可以用以下方法重新设置：

1. KILL掉系统里的MySQL进程；[html] killall -TERM mysqld 2. 用以下命令启动MySQL，以不检查权限的方式启动；[html] safe_mysqld --skip-grant-tables & 3. 然后用空密码方式使用root用户登录 MySQL；[html] mysql -u root 4. 修改root用户的密码；[html] mysql> update mysql.user set password=PASSWORD('新密码') where User='root'; mysql> flush privileges; mysql> quit 

重新启动MySQL，就可以使用新密码登录了。

二. MySQL密码的恢复方法二

有可能你的系统没有 safe_mysqld 程序(比如我现在用的 ubuntu操作系统, apt-get安装的mysql) , 下面方法可以恢复

1. 停止mysqld；

[html] /etc/init.d/mysql stop 

(您可能有其它的方法,总之停止mysqld的运行就可以了)

2. 用以下命令启动MySQL，以不检查权限的方式启动；

[html] mysqld --skip-grant-tables & 

3. 然后用空密码方式使用root用户登录 MySQL；

mysql -u root

4. 修改root用户的密码；

[html] mysql> update mysql.user set password=PASSWORD('newpassword') where User='root'; mysql> flush privileges; mysql> quit 

重新启动MySQL

[html] /etc/init.d/mysql restart 

就可以使用新密码 newpassword 登录了

mysql The server quit without updating PID file异常解决办法

安装好mysql后，用

Java代码

/usr/local/mysql/bin/mysqld_safe &

去启动mysql，总是处于僵死状态，后来去suport_files 用mysql.server start 来启动，

提示mysql The server quit without updating PID file。在网上找了下，原来说是有mysql

启动的僵死进程。

用ps -ef |grep mysql 发现有

Php代码 root 4507 1 0 21:40 ? 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --user=mysql mysql 4793 4507 0 21:40 ? 00:00:03 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql....... 

于是kill 4793，再启动。就正常了

ps：kill root下的进程4507是没

Mysql报错的解决'Can't connect to local MySQL server through socket '/tmp/mysql.sock'

[root@localhost mysql]# mysqlERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111)[root@localhost mysql]# service mysqld restart 这里说明mysqld并没有启动，MySQL manager or server PID file could not be found! [FAILED]Starting MySQL/etc/init.d/mysqld: line 159: kill: (177) - No such process [FAILED][root@localhost mysql]# cd bin[root@localhost bin]# ./mysqlERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111) 这里就说了不能通过/tmp/mysql.sock连接数据库。[root@localhost bin]# cd /tmp 进去检查，看到有这个文件，所以看别的原因。[root@localhost tmp]# lsgconfd-root mapping-root mysql.sock mysql-test-ports mysql-test-ports.sem scim-panel-socket:0-root VMwareDnD vmware-root vmware.txt[root@localhost tmp]# cd /usr/local/mysql/[root@localhost mysql]# pwd/usr/local/mysql[root@localhost mysql]# chown -R root:mysql . 忽然想起来了没有设置权限呢，开始设置权限[root@localhost mysql]# lltotal 36drwxr-xr-x 2 root mysql 4096 Nov 28 21:51 bindrwxr-xr-x 3 root mysql 4096 Nov 28 21:50 includedrwxr-xr-x 2 root mysql 4096 Nov 28 21:50 infodrwxr-xr-x 3 root mysql 4096 Nov 28 21:50 libdrwxr-xr-x 2 root mysql 4096 Nov 28 21:51 libexecdrwxr-xr-x 4 root mysql 4096 Nov 28 21:50 mandrwxr-xr-x 8 root mysql 4096 Nov 28 21:51 mysql-testdrwxr-xr-x 3 root mysql 4096 Nov 28 21:50 sharedrwxr-xr-x 5 root mysql 4096 Nov 28 21:50 sql-bench[root@localhost mysql]# chown -R mysql /var/lib/mysql[root@localhost mysql]# cp share/mysql/my-huge.cnf /etc/my.cnf[root@localhost mysql]# cp share/mysql/mysql.server /etc/rc.d/init.d/mysqld[root@localhost mysql]# chmod 755 /etc/rc.d/init.d/mysqld[root@localhost mysql]# chkconfig --add mysqld[root@localhost mysql]# chkconfig --level 345 mysqld on=======error========[root@localhost mysql]# mysqladmin -u root password 'uplooking'mysqladmin: connect to server at 'localhost' failederror: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111)'Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists! 又是上边一样的错误[root@localhost mysql]# bin/mysql startERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111)[root@localhost mysql]# /etc/rc.d/init.d/mysqld statusMySQL is not running, but lock exists [FAILED] 这里说的是没有运行着mysql，但是还在锁定。这时候我看到了下边那篇文章，重新检查了一遍权限，[root@localhost mysql]# chown -R mysql:mysql /var/lib/mysql 在这里，我原来设置的时候这个组没有设置，只写了chown -R mysql /var/lib/mysql，分组被我忽略掉了，哎，折腾这么长时间。[root@localhost mysql]# /etc/rc.d/init.d/mysqld start 从这里，mysql启动正常了Starting MySQL [ OK ][root@localhost mysql]# /etc/rc.d/init.d/mysqld stopShutting down MySQL [ OK ][root@localhost mysql]#[root@localhost mysql]# mysqladmin -u root password 'uplooking' 这里是说服务器没有启动mysqladmin: connect to server at 'localhost' failederror: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)'Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists![root@localhost mysql]# /etc/rc.d/init.d/mysqld start 启动服务器Starting MySQL [ OK ][root@localhost mysql]# mysqladmin -u root password 'uplooking' 添加root密码[root@localhost mysql]# mysqlERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)[root@localhost mysql]# mysql -u root -p 用root密码登陆，测试。Enter password:Welcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 3Server version: 5.0.56-Comsenz-log SourceType 'help;' or '/h' for help. Type '/c' to clear the buffer.mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || test |+--------------------+3 rows in set (0.00 sec)mysql> quitBye[root@localhost mysql]# service mysqld restartShutting down MySQL [ OK ]Starting MySQL [ OK ][root@localhost mysql]#====权限的验证测试====[root@localhost mysql]# cd /tmp[root@localhost tmp]# mkdir test[root@localhost tmp]# cd test[root@localhost test]# ls[root@localhost test]# touch 11[root@localhost test]# lltotal 0-rw-r--r-- 1 root root 0 Nov 28 22:37 11[root@localhost test]# chown -R mysql 11[root@localhost test]# lltotal 0-rw-r--r-- 1 mysql root 0 Nov 28 22:37 11[root@localhost test]#=========================