net ipv4

Pre-installation: simple installation and post-Installation Considerations: 1. Nginx's Disaster Recovery Cluster Server Load balancer should be considered; 2. health check is not performed on web nodes; 1. Environment preparation: Centos5.4Nginx1.2.1

Diagnosis and blocking of SYN flood attacks on Linux server, linuxsynThis article describes how to diagnose and block SYN flood attacks on Linux servers. For more information, see 1. IntroductionSYN Flood is one of the most popular DoS (Denial of

Linux Performance Tuning 15th: common network parameter sorting about linux Performance Tuning 14th: Adjusting socket buffer http://www.bkjia.com/ OS /201307/230154.html 1. tcp connection persistence management: net. ipv4.tcp _ keepalive_time = 7200

Install and deploy LVS in CentOS 7.0 System: CentOS Linux release 7.0.1406 (Core)First, set the system language format and use the yum command that comes with the system to install and upgrade the required library.# LANG = CYuminstall gcc-c ++

SYN flood attacks (SYNFloodingAttack) are attacks that use the imperfect TCP/IP three-way handshake protocol to maliciously send a large number of packets containing only the SYN handshake sequence. This attack method may cause the attacked computer

SYN flood attacks (SYN Flooding Attack) are attacks that use the imperfect TCP/IP three-way handshake protocol to maliciously send a large number of packets containing only the SYN handshake sequence. This attack method may cause the attacked

I. Introduction to the Basic overviewIi. types and principles of LVSThree, LVS scheduling algorithmIv. using DR and Nat to achieve web load balancingI. Introduction to the Basic overviewLVS is a load balancing software that works at the transport

Before doing this, you need to empty the rules of Ipvsadm and the NAT rules of Iptables:Ipvsadm-cIptables-t nat-fRestore the gateway for Rs1 and RS2 and close the dir's extranet IP:Ifdown eth1Dr Mode Rs must have a separate public IP, so that the

Lvs:linux Virtual ServerA free software project initiated by Dr. Zhangwensong, whose official site is www.linuxvirtualserver.org.Now LVS is already part of the Linux standard kernel, Prior to the Linux2.4 kernel, the LVS had to be recompiled to

On the basis of the previous experiment, LVS/DR(Nta,dr HA is operated with Nginx service, eliminating the installation of Nginx installation configuration)Although the LVS have been successfully configured and load balanced, we found that when a

1 Dr Mode Introductioninstallation of 1.1 LVsInstallation Detailed: http://blog.csdn.net/CleverCode/article/details/50586957.1.2 LVs ModeLVS has three modes of Dr,nat,tun. This first introduces Dr mode.1.3 Dr Features1) Load balancer and all real

Netstat-N | awk '/^ TCP/{++ s [$ NF]} end {for (a in S) print a, s [a]}' Result: In addition to established, we can see several statuses with many connections: fin_wait1, time_wait, close_wait, syn_recv, and last_ack;ArticleBriefly describe

1. OverviewIn the previous article, "Architecture Design: Load balancer layer Design (4)--lvs principle" (http://blog.csdn.net/yinwenjie/article/details/46845997), we introduced the working mode of LVS, and the specific work processes of each model.

LVS introduction: The LVS cluster has three configuration modes: DR, Tun, and Nat. You can perform Load Balancing for WWW Service, FTP service, and mail service. below, you can build a load balancing instance for WWW Service, DRDs-based LVS cluster

The following content is reproduced from http://blog.csdn.net/ndcs_dhf2008/article/details/5709386 Resin installation and configuration optimization 1. Resin installation and auto-Start SettingsCreate boot auto startCP contrib/init. Resin/etc/rc.

Adjust Linux (ubuntu8.0.4) kernel parameters to meet high-concurrency access and solve a large number of time_wait and SYN Attacks: 1 sudo VI/etc/sysctl. conf Edit and add at the bottom: Net. ipv4.tcp _ fin_timeout = 30 Net. ipv4.tcp _

Linux Firewall iptables and linuxiptablesIntroduction to Linux Firewall: first, network packets need to enter your host through the firewall, server software program (Verification account), SELinux and File System (permission rwx, etc. Main firewall

This article is published in the Linux format magazine. The author explains in depth how Linux kernel works. I believe it will be of great help to Linux developers. The definition of the word "kernel" in the Oxford dictionary is: "A soft, usually

After the CentOS system is installed, it cannot be immediately used in the production environment. It usually needs to be optimized by our O & M personnel. Here are some basic optimization operations for Linux system installation. Note: This

Centos7.2 64-bit LVS + Keeplived high-availability multi-instance installation and deployment tutorial, centos7.2lvs How to install and deploy 64-bit LVS + Keeplived high-availability multi-instance in Centos7.2 Software packages required for system: