Server Environment: Red Hat Linux 5.5, Nginx, PHP FastCGI. In this environment, php-cgi typically runs very stably, but we have encountered situations where php-cgi consumes too many CPU resources, causing the server to respond too slowly. The reasons I’ve seen for php-cgi processes consuming excessive CPU resources include: 1. Some PHP …
LAMP (Linux-Apache-MySQL-PHP) Website Architecture is a currently popular international Web framework that includes the Linux operating system, Apache web server, MySQL database, and Perl, PHP, or Python programming languages. All components are open-source software, making it a mature, internationally recognized architectural framework. …
When a website reaches a certain scale, performance issues are prone to arise at various stages: for instance, database inefficiencies, high load on the front-end server, I/O bottlenecks, insufficient cache as data grows, or excessive network overhead for data synchronization. Below are the problems encountered in my own projects and possible…
1. Starting the LVS Cluster Service
There are two ways to manage and use LVS load balancing: one is through the ipvsadm command-line scripts and ldirectord monitoring method, and the other is through the Piranha tool for management and usage. They are introduced separately below. 1. Managing with ipvsadm command-line scripts and ldirectord monitoring method …
LVS clusters have three configuration modes: DR, TUN, and NAT, which can be used for load balancing of www services, FTP services, MAIL services, etc. Below, through setting up a load balancing instance for www services, we illustrate the configuration of an LVS cluster based on DR mode.
1. Director Server Configuration
Configure LVS on the Director Server …
I. Installing LVS Software
1. Pre-Installation Preparation
Operating System: CentOS 4.4 is used uniformly.
Address planning, as shown in Table 1:
Table 1 More detailed information is shown in Figure 2: Figure 2 LVS DR Mode Installation and Deployment Architecture Diagram
The VIP in Figure 2 refers to the Virtual IP Address, also known as the LVS cluster service IP, in …
1. Introduction to LVS
LVS, short for Linux Virtual Server, is a free software project initiated by Dr. Wensong Zhang. Its official website is www.linuxvirtualserver.org. LVS is now part of the standard Linux kernel, included since Linux 2.4 ker …
I. Introduction to Nagios Nagios is an open-source computer system and network monitoring tool that can effectively monitor the status of Windows, Linux, and Unix hosts, network devices such as switches and routers, printers, and more. When a system or service experiences an abnormal state, it sends email or SMS alerts to immediately notify website operations personnel…
I. Nagios Introduction Nagios is an open-source computer system and network monitoring tool that can effectively monitor the status of Windows, Linux, and Unix hosts, network devices such as switches and routers, printers, and more. It sends email or SMS alerts immediately when system or service anomalies occur, notifying website operations personnel, and sends normal recovery notifications when the state is restored.
Due to increasing user numbers, I implemented scalable, highly reliable cluster deployment (LVS+Keepalived). However, users still reported slow access. The root cause was the NFS shared storage server.
