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Operation and Maintenance

What Are the Key Features of CentOS's LVM and How to Use It for Storage Management?

This article details CentOS's Logical Volume Manager (LVM), highlighting its flexibility in creating, resizing, and moving logical volumes without reboots. LVM uses volume groups combining physical volumes for scalable storage management, offering s

Mar 12, 2025 pm 06:20 PM

How to Build Resilience with Linux High Availability Clustering

introduction In the era of digital transformation, system uptime and continuous availability are crucial to businesses across all industries. High availability (HA) clustering has become a key strategy to ensure that services remain accessible, ensuring that services are not interrupted even in the face of hardware or software failures. With its powerful robustness and flexibility, Linux has become the ideal platform for deploying HA solutions. This article explores the concept of Linux high availability clusters in depth, and explores its mechanisms, technologies and their key roles in building resilient and fault-tolerant systems. Cluster concept Fundamentally, a cluster is a collection of interconnected computers that work together as a single system to provide a higher level of availability, reliability, and scalability

Mar 09, 2025 pm 01:03 PM

Redis high availability practice

0×01 Preface Redis is an open source log-type Key-Value database written in ANSIC language, supports network, can be memory-based and persistent, and provides APIs in multiple languages. Nowadays, Internet business data is growing at a faster rate, and data types are becoming more and more abundant, which puts forward higher requirements for data processing speed and capabilities. Redis is an open source in-memory non-relational database that brings a disruptive experience to developers. Designed from start to finish with high performance in mind, Redis is the fastest NoSQL database available today. While considering high performance, high availability is also an important consideration. Internet 7×24 uninterrupted service during downtime

Aug 20, 2024 pm 04:51 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

Redis high availability practice

Aug 20, 2024 pm 04:51 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

Describe in detail the VIP and DIP cross-segment examples of LVS-DR

In daily application environment, we will encounter such a lvs deployment environment. All DRs and rsservers are in a LAN environment, but there is only one public network IP, and the application needs to be published to the Internet. We all know lvs The best model is that all servers have a public network IP, but in many cases public network resources are scarce. When there is only one public network IP, how to release LVS to the outside world? 1. Experimental topology 2. Overall environment 3. Detailed configuration Router configuration eth0: Public network IP access INTERNETeth1: 172.18.68.10 (public network IP) # Use 172.18.68.10 as public network IPeth2 in the experimental environment:

Jul 23, 2024 pm 01:46 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

AIX_EXT_VG

#lspvhdisk000cd7e82847793f8rootvgactivehdisk100c759e2b092ddeealtinst_rootvg#lsvgrootvgdatavgJDEvgvgbackupaltinst_rootvgrmanbakvg#varyonvg-faltinst_rootvg#bootinfo-shdiskpower3##扩容rmanbakvgVGextendvgrmanbakvghdiskpower3#lspv#lspvhdisk000cd7e82847793f8

Feb 20, 2024 am 11:00 AM

altinst lspv rootvg lsp

Keepalived installation and VIP automatic drift

Keepalived is a high-availability solution based on LVS (Linux Virtual Server), which is mainly used for load balancing and failover in Linux environments. Keepalived ensures service continuity and reliability by using virtual IP addresses (VIPs) and health check mechanisms. Among them, VIP automatic drift is a key feature of Keepalived, which allows the service to be seamlessly switched to the backup server when the main server fails. This article will briefly introduce the installation and configuration of Keepalived to achieve high availability clusters. It is designed to provide guidance for beginners to help them master this key technology and improve their Linux system management capabilities. Terminology explanation for a deeper understanding of Kee

Feb 19, 2024 pm 01:30 PM

linux vip

Main architecture of Linux system

The Linux system is a complex and elegant software project. It is composed of multiple different components that work together to provide powerful functions and performance. But, do you know what the main architecture of a Linux system is? This article will introduce the four main components of the Linux system: kernel, shell, file system and application, as well as the relationship and role between them. With the continuous development of IT operation and maintenance, especially the rapid development of Linux, more and more enterprises are beginning to use Linux operating system platforms, such as CentOS, RedHat, Ubuntu, Fedora, etc., and hundreds of millions of websites have emerged on the Internet today. , the Internet has become an indispensable tool, so today we will share it with you

Feb 14, 2024 am 11:40 AM

linux linux系统 linux命令 shell脚本 linux教程嵌入式linux linux入门

CentOS installs LVS and CentOS installs virtual machine

As an open source operating system, LINUX's stability and reliability have been widely recognized and applied. Among LINUX systems, CentOS is a very popular version and is known for its stability and security. This article will introduce How to install LVS (LinuxVirtualServer) on CentOS system and how to install virtual machine on CentOS system. CentOS installation LVSLVS is a load balancing software based on the Linux kernel. It can distribute access requests to multiple servers, thereby improving the performance and reliability of the system. The following are the steps to install LVS on CentOS systems: 1. Make sure you CentOS system has installed the latest

Feb 09, 2024 pm 03:12 PM

linux 虚拟机 centos lvs

Establish a mac virtual machine cluster

Introduction: This article is here to introduce you to the relevant content about mac virtual machine clusters. I hope it will be helpful to you, let’s take a look. How to set up the shared folder of the vmware virtual machine on a Mac computer? First, enter the virtual machine and open the [Finder Preferences] window. According to the picture below, check all menu options one by one. This is the first step. After completing the check, follow the arrow instructions and click the [Virtual Machine-Install VmwareTools] option. This is the second step. To configure a shared folder in a Windows virtual machine, follow these steps: Start VMwareFusion and then start the desired virtual machine. In the virtual machine, click on the Settings option. Then select the "Share" option. In Fu

Jan 23, 2024 pm 02:33 PM

Mac

Steps to enter CentOS 7 emergency repair mode

Open the centos7 page and appear: welcome to emergency mode! afterloggingin, type "journalctl -xb" to viewsystemlogs, "systemctlreboot" toreboot, "systemctldefault" to tryagaintobootintodefaultmode. giverootpasswordformaintenance(??Control-D???): Solution: execute r

Jan 13, 2024 am 09:36 AM

centos7 紧急修复

DPVS: an open source load balancer

IntroductionDPVS is a high-performance layer 4 load balancer based on DPDK. Modified based on Alibaba/LVS, out of blue and better than blue. The full name of DPDK is "DPDK-LVS". In order to achieve high performance, a variety of different technologies are used Kernel bypass (user space implementation) No CPU, no key data (no locks) RX steering and CPU binding (avoiding context switches) Batch TX/RXZero copying (avoiding packet copying and system calls). Polling replaces interrupts. Lock-free messages for high-performance ICP. Other technologies enhanced by DPDK The main features of DPVS include: L4 load balancer, including FNAT, DR mode and other different scheduling algorithms such as RR, WLC, WRR and other user space LiteIP

Jan 10, 2024 pm 07:10 PM

Linux 红帽

Web server performance improvement methods

Introduction With the continuous development of the Internet, more and more needs in daily life are realized through the Internet. From food, clothing, housing and transportation to financial education, from pockets to identity, people rely on the Internet all the time, and more and more people complete their tasks through the Internet. own needs. As a Web server that directly faces requests from customers, it will undoubtedly have to withstand more requests at the same time and provide users with a better experience. At this time, the performance of the web side often becomes a bottleneck for business development, and it is urgent to improve performance. The author of this article summarized some experiences in improving the performance of the Web server during the development process and shared them with everyone. Problem Analysis Regarding the performance of the Web server, first we analyze the relevant indicators. From the user's perspective, when the user calls the Web service, the request return time

Jan 07, 2024 pm 06:10 PM

Linux Linux系统红帽 Linux命令 linux认证红帽linux linux教程 linux视频

How to adjust swap size in Linux? Tips for expanding Linux swap partition

Let me share with you how to expand the swap partition capacity in Linux. First, use the fdisk-l command to check the size of the swap partition of the current system. The current size is 4G; edit the host settings and add a 10G hard disk. Use the fdisk-l command again to check whether the newly added hard disk is recognized normally. For the newly added hard disk partition, adjust the format to LVM and use: fdisk/dev/sdb-->n-->p-->1-->Enter->Enter-->t-->8e-- >p-->w command. Use partx/dev/sdb to view the newly formatted hard disk and view the status of pv, vg and lv before expansion.

Jan 03, 2024 pm 07:46 PM

Linux swap分区