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Squid: used by the proxy server and Web Accelerator.

Apache high concurrency

MySQL

Nginx Reverse Proxy Server

CDN content diliery network. Content Delivery Network

The basic idea is to avoid bottlenecks and links on the Internet that may affect data transmission speed and stability, so that content transmission can be faster and more stable. A layer of smart virtual network formed by placing node servers in various parts of the network on the basis of the existing Internet, the CDN system can redirect users' requests to the nearest service node in real time based on the network traffic and connection, load status, distance to the user and response time of each node.. The aim is to allow users to obtain the desired content nearby, solve the problem of Internet congestion, and improve the response speed when users access the website.

VPN SSH

Remote Access is achieved through data packet encryption and Data Packet Destination conversion.

LVS

Ttserver

Domain name resolution:

Monitoring:

Network faults:

Cloud computing and Virtualization:

Script Language: shell, Perl, Python.

Automated O & M

Cacti, Nagios zabbix

1). nrpe and SNMP protocols

In Linux, cacti mainly uses the SNMP protocol. SNMP is a Simple Network Management Protocol. It uses Fixed protocols to provide comprehensive information about the system running status in the oId format, then, the SNMP agent is used to obtain the information and draw the traffic. Nagios uses the nrpe plug-in Linux. nrpe uses SSL to call the status monitoring script of the monitored host in the C/S structure, and provides the obtained information to the monitoring server in real time.

2) differences between Nagios and cacti

Cacti has good metric charts and has advantages in traffic and graphic presentation.

Nagios: the fault analysis is relatively good, and the alarm mechanism is relatively good. The alarm mechanism is mailbox, text message, and more flexible than cacti; at the same time, it is applicable to monitoring the status of a large number of servers and a large number of servers. The focus is not on graphics, but the monitoring of status faults is well known:

Cacti is immersed in the collection of traffic graphics and system load. Nagios and the text message sender can work together on a large network. The cacti and Nagios work together to learn from each other.

Server Load balancer: Transfers tasks on overload nodes to other light nodes to achieve load balancing among all nodes of the system as much as possible.

Load Balancing policy: transfer, select, locate, and information.

SDN: Software Defined network software defines the Network/separates the control plane of the network device from the data plane.

SVN: Subversion Version Control System

Version Control is a software engineering technique that updates the same file edited by different people during development.

Apache nginx dynamic, static, reverse, concurrency, rewrite. Front-end response, Background

The front-end design is all the images, text, and animated effects that your eyes can see. Master HTML, CSS, JS, and various image and video processing software. The backend is designed to process data, as well as some scripting languages.

Dynamic Web pages are different from static Web pages. Whether a website uses dynamic web pages or static Web pages depends on the functional requirements of the website and the content of the website. If the website function is relatively simple, the amount of content updated is not very large. It is easier to use pure static Web pages. On the contrary, dynamic web pages are usually used. However, dynamic websites are usually used now. If content is updated, it can be updated at any time in the background.

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