文章介绍的是在linux中的Centos 下用yum 命令部署lamp环境,供大家参考
1. Centos 默认是打开IP安全策略的,也就是80端口也禁止外部访问,所以先停用iptables.
service iptables stop
或者对80端口开放
iptables -I RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT
2. 安装
yum install httpd (只安装apache),如果要安装其它插件可以
yum -y install httpd-manual mod_ssl mod_perl mod_auth_mysql
安装后的网页位置是 /var/www/html
3. 安装mysql
yum install mysql mysql-server mysql-devel
安装完成以后,运行mysql 可能出现以下错误:Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock 这个错误的原因有很多种,一种这个时候/var/lib/mysql/目录下找不到mysql.sock这个文件,可以运行 service mysqld start 或 (/etc/init.d/mysqld start) 如果成功启动mysql,那么会在/var/lib/mysql/目录下生成mysql.sock文件的,这个时候就将mysql 设置系统启动时,自动启动,否则又会重复Can't connect to local MySQL server through socket 错误。自动启动命令如下: chkconfig mysqld on
系统默认不会设置密码的,就是空密码,如果要设置mysql 密码,假设密码设置为123456
mysqladmin -u root pass 123456
如果要开通外部访问mysql,就要设置用户可供外部访问
mysql> GRANT ALL PRIVILEGES ON *.* TO '用户名'@'地址' IDENTIFIED BY '密码' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;
例子,允许root 用户用123456密码192.168.6.6 连接
mysql> GRANT ALL PRIVILEGES ON *.* TO ‘root'@'192.168.6.6' IDENTIFIED BY '123456' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;
例子,允许所有外部,用户root 密码123456 连接
mysql> GRANT ALL PRIVILEGES ON *.* TO ‘root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;
例子,允许IP为192.168.6.6 ,用户root 密码123456 连接USER数据库
mysql> GRANT ALL PRIVILEGES ON USER.* TO ‘root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;
4. 安装php
yum install php php-mysql php-common php-gd php-mbstring php-mcrtpt php-devel php-xml

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MySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte

MySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose

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ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.


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