apache 虚拟ip,apacheip
参考 http://blog.sina.com.cn/s/blog_5d8ca1e90100hnpv.html
DocumentRoot C:/xampp/htdocs/yiyunmap
ServerName 127.0.0.1:80
DocumentRoot C:/xampp/htdocs/user
ServerName 127.0.0.2:80
Options Indexes FollowSymLinks Multiviews
AllowOverride All
Order Allow,Deny
Allow from all
Options Indexes FollowSymLinks Multiviews
AllowOverride All
Order Allow,Deny
Allow from all
步骤一:为主机中的不同网卡设置各自的IP地址 apache主要是应用层的软件,LVS主要是网络层和传输层的软件。虽然都可以做转发,但定位不同:
# ifconfig eth0 192.168.149.1
# ifconfig eth0:1 192.168.149.2
步骤二:在httpd.conf配置文件中,为每个虚拟主机设置不同
的
ServerAdmin root@abc.com
DocumentRoot /www/abc
ServerName www.abc.com
ServerAdmin root@good.com
DocumentRoot /www/good
ServerName www.good.com
步骤三:为不同的虚拟站点创建主页文件
# echo 'Welcome to abc' > /www/abc/index.html
# echo 'Welcome to GOOD' > /www/good/index.html
步骤四:重新启动Apache服务
# service httpd restart
apache主要功能还是WEB服务,在高可用和可扩展方面是比较弱的,其转发功能是为了扩展而实现的附加功能;
LVS是基于linux内核的负载均衡系统,结合keepalived,或heartbeat+Ldirectord,或红帽piranha等高可用套件,在负载均衡、高可用和可扩展方面是专业的,常用于高并发WEB服务。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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