linux下MySQL安装与删除 (Ubuntu下)

1、MySQL安装 A）MySQL安装： sudo apt-get install mysql-server mysql-client B）启动/停止MySQL服务： MySQL 在安装以后，MySQL 就已经启动；如果需要手动启动或停止则如下操作： 手动启动服务： sudo start mysql 手动停止服务： sudo stop mysql 当修改

1、MySQL安装

A）MySQL安装：    sudo apt-get install mysql-server mysql-client　 

B）启动/停止MySQL服务：

      MySQL 在安装以后，MySQL 就已经启动；如果需要手动启动或停止则如下操作：

      手动启动服务：       sudo start mysql  

      手动停止服务：       sudo stop mysql

      当修改mysql相关配置的时候，需要手动重启MySQL服务，就需要如上操作。

      查看mysql进程是否已经启动：

      

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ps  -aux  |  grep  mysql 

       #ps -aux 显示当前所有进程(包括 mysql , 和 name 用户 )，  grep mysql 用来查找 mysql 进程 ；具体使用可以查看 ps,  grep 用法

       #man  ps              ;     man  grep

或者使用：

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sudo netstat -tap | grep mysql

 两种命令的结果：

 

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name@ThinkPad:~$ ps -aux | grep mysql

Warning: bad ps syntax, perhaps a bogus'-'? See http://procps.sf.net/faq.html

mysql      25994 0.0  0.9 137800 18400 ?        Ssl 10:18   0:10 /usr/sbin/mysqld

name       26543 0.0  0.1   8544  2320 pts/2   S+   11:06  0:00 mysql -u root -p

name       27068 0.0  0.1   8388  2064 pts/1   S+   18:21  0:00 mysql -u root -p

name       27917 0.0  0.0   5412   788 pts/3   S+   21:45  0:00 grep --color=auto mysql

 

 

name@ThinkPad:~$ sudo netstat -tap | grep mysql

tcp        0      0 localhost:mysql         *:*                     LISTEN      25994/mysqld

 

C）MySQL 配置文件结构：

      MySQL 配置文件为 my.cnf , 位置在 /etc/my.cnf       以及   /etc/mysql/my.cnf

      

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#

# The MySQL database server configuration file.

#

# You can copy this to one of:

# - "/etc/mysql/my.cnf"to set global options,

# - "~/.my.cnf"to set user-specific options.

#

# One can use all long options that the program supports.

# Run program with --helpto get a list of available options and with

# --print-defaults to see which it would actually understand and use.

#

# For explanations see

# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

 

# This will be passed toall mysql clients

# It has been reported that passwords should be enclosed with ticks/quotes

# escpecially if they contain"#" chars...

# Remember to edit /etc/mysql/debian.cnf when changing the socket location.

[client]

port        = 3306

socket      = /var/run/mysqld/mysqld.sock

 

# Here is entries for some specific programs

# The following values assume you have at least32M ram

 

# This was formally known as [safe_mysqld]. Both versions are currently parsed.

[mysqld_safe]

socket      = /var/run/mysqld/mysqld.sock

nice        = 0

 

[mysqld]

#

# * Basic Settings

#

 

#

# * IMPORTANT

#   If you make changes to these settings and your system uses apparmor, you may

#   also need to also adjust /etc/apparmor.d/usr.sbin.mysqld.

#

 

user        = mysql

socket      = /var/run/mysqld/mysqld.sock

port        = 3306

basedir     = /usr

datadir     = /var/lib/mysql

tmpdir      = /tmp

skip-external-locking

#

# Instead of skip-networking thedefault is now to listen only on

# localhost which is more compatible and is not less secure.

bind-address        =127.0.0.1

#

# * Fine Tuning

#

key_buffer      =16M

max_allowed_packet  =16M

thread_stack        =192K

thread_cache_size       =8

# This replaces the startup script and checks MyISAM tables if needed

# the first time they are touched

myisam-recover         = BACKUP

#max_connections        =100

#table_cache            =64

#thread_concurrency     =10

#

# * Query Cache Configuration

#

query_cache_limit   =1M

query_cache_size        =16M

#

# * Logging and Replication

#

# Both location gets rotated by the cronjob.

# Be aware that this log type is a performance killer.

# As of 5.1you can enable the log at runtime!

#general_log_file        = /var/log/mysql/mysql.log

#general_log             =1

 

log_error                = /var/log/mysql/error.log

 

# Here you can see queries with especially long duration

#log_slow_queries   = /var/log/mysql/mysql-slow.log

#long_query_time =2

#log-queries-not-using-indexes

#

# The following can be used as easy to replay backup logs or for replication.

# note: if you are setting up a replication slave, see README.Debian about

#       other settings you may need to change.

#server-id      =1

#log_bin            = /var/log/mysql/mysql-bin.log

expire_logs_days    =10

max_binlog_size         =100M

#binlog_do_db       = include_database_name

#binlog_ignore_db   = include_database_name

#

# * InnoDB

#

# InnoDB is enabled bydefault with a 10MB datafile in /var/lib/mysql/.

# Read the manual for more InnoDB related options. There are many!

#

# * Security Features

#

# Read the manual, too, if you want chroot!

# chroot = /var/lib/mysql/

#

# For generating SSL certificates I recommend the OpenSSL GUI"tinyca".

#

# ssl-ca=/etc/mysql/cacert.pem

# ssl-cert=/etc/mysql/server-cert.pem

# ssl-key=/etc/mysql/server-key.pem

 

 

 

[mysqldump]

quick

quote-names

max_allowed_packet  =16M

 

[mysql]

#no-auto-rehash #faster start of mysql but no tab completition

 

[isamchk]

key_buffer      =16M

 

#

# * IMPORTANT: Additional settings that can override those from this file!

#   The files must end with'.cnf', otherwise they'll be ignored.

#

!includedir /etc/mysql/conf.d/

   在启动MySQL的时候会通过读取配置文件my.cnf ，并根据这个文件的路径： /var/run/mysqld/mysqld.sock 启动MySQL

　datadir = /var/lib/mysql  #这句是数据库所在位置，比如如果创建一个数据库mysql_first，则数据库文件放置在该目录下。

 

    log_error = /var/log/mysql/error.log  # mysql错误文件，如果在执行mysql出错了，可以查看该文件。

 

D）进入MySQL

      进入MySQL一般需要密码， 除非使用 safe_mysql

      如果不提供密码则会出现如下错误提示：

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ERROR 1045(28000): Access denied for user'name'@'localhost'(using password: NO)

      这是因为在安装MySQL输入了密码，需要提供密码；

      具体：

 

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name@ThinkPad:~$ sudo mysql -u root -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is40

Server version: 5.1.58-1ubuntu1(Ubuntu)

 

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

This software comes with ABSOLUTELY NO WARRANTY. This is free software,

and you are welcome to modify and redistribute it under the GPL v2license

 

Type 'help;'or '\h' for help. Type '\c' to clear the current input statement.

 

mysql>

      sudo mysql -u root -p  # 这里的几个参数:  u 表示 user ,后面是参数；  p 表示 password ,会在后面有 Enter password: 提示

      也可以直接提供用户和密码(使用 -- )   

      sudo mysql --user=root  --password=123456

 

C）退出MySQL

      主要有三种方式：

　　mysql> exit
　　Bye

　　mysql> quit
　　Bye

       mysql> #直接按Ctrl + D

 

 

2、卸载MySQL

A）卸载MySQL软件

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sudo apt-get autoremove --purge mysql-server-5.1

sudo apt-get remove mysql-server

sudo apt-get autoremove mysql-server

sudo apt-get remove mysql-common

    

sudo apt-get autoremove --purge mysql-server-5.1 # 中 mysql-server-5.1是系统安装的 mysql-server版本

B）清理其他数据

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dpkg -l |grep ^rc|awk'{print $2}' |sudo xargs dpkg -P<br> <br> <br> <br> <br> <br> <br> <br> <br> <br> 1、删除 mysql<br> <br>

1 sudo apt-get autoremove --purge mysql-server-5.0
2 sudo apt-get remove mysql-server
3 sudo apt-get autoremove mysql-server
4 sudo apt-get remove mysql-common (非常重要)

上面的其实有一些是多余的，建议还是按照顺序执行一遍

清理残留数据

dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P

2、安装 mysql

1 sudo apt-get install mysql-server
2 sudo apt-get install mysql-client
3 sudo apt-get install php5-mysql(安装php5-mysql 是将php和mysql连接起来)

 

一旦安装完成，MySQL 服务器应该自动启动。您可以在终端提示符后运行以下命令来检查 MySQL 服务器是否正在运行：

1 sudo netstat -tap | grep mysql

当您运行该命令时，您可以看到类似下面的行：

tcp 0 0 localhost.localdomain:mysql *:* LISTEN -

如果服务器不能正常运行，您可以通过下列命令启动它：

1 sudo /etc/init.d/mysql restart

3、进入mysql

$mysql -uroot -p 管理员密码
配置 MySQL 的管理员密码：

1 sudo mysqladmin -u root password newpassword