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：
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：
sudo netstat -tap | grep mysql |
两种命令的结果：
name@ThinkPad:~$ ps -aux | grep mysqlmysql 25994 0.0 0.9 18400 ? Ssl 10:18 10 /usr/sbin/mysqldname 26543 0.0 0.1 2320 pts/2 S+ 11:06 0:00 name 27068 0.0 0.1 2064 pts/1 S+ 18:21 0:00 name 27917 0.0 0.0 788 pts/3 S+ 21:45 0:00 auto mysqlname@ThinkPad:~$ sudo netstat -tap | grep mysqltcp 0 0 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
## 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# 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 = 3306socket = /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.socknice = 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 = mysqlsocket = /var/run/mysqld/mysqld.sockport = 3306basedir = /usrdatadir = /var/lib/mysqltmpdir = /tmpskip-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 =16Mmax_allowed_packet =16Mthread_stack =192Kthread_cache_size =8# This replaces the startup script and checks MyISAM tables if needed# the first time they are touchedmyisam-recover = BACKUP#max_connections =100#table_cache =64#thread_concurrency =10## * Query Cache Configuration#query_cache_limit =1Mquery_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 =1log_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.logexpire_logs_days =10max_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]quickquote-namesmax_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：
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：
name@ThinkPad:~$ sudo mysql -u root -pEnter password:
Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is40Server 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 v2licenseType 'help;'or '\h' 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
sudo apt-get autoremove --purge mysql-server-5.1sudo apt-get remove mysql-serversudo apt-get autoremove mysql-serversudo 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
dpkg -l |grep ^rc|awk
'{print $2}' |sudo xargs dpkg -P