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This afternoon, I attended the reply meeting of Dr. Kong and listened to the report of the doctor. I also saw a few experts who raised a very sharp question. Unfortunately, after learning, I checked out my answers from my senior colleagues. .. Haha Today, I also learned that at graduation, there was a potential rule to eat. Oh, it sounds natural, right? What you don't know when you have a meal together as a trainee: those who are still very powerf

productivity.Andreessen Horowitz and some other investors had injected Box.net $48 million earlier this year. CEO Levi said this is because of the company's outstanding performance and good performance in the "cloud" market. After the box.net became an expensive acquisition object.As a partner, Salesforce says two companies are betting on "cloud" services. Box.net integrates Salesforce's corporate social platform into their products, and says there will be deeper product collaborations in the f

Install Ipvsadm and Keepalivedyum-yinstallkeepalivedipvsadm shut down the firewall serviceiptables stop Close selinux setenforce0 installation httpd NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;YUMNBSP;-YNBSP;INSTALLNBSP;HTTPD Inhibition of arp echo2> /proc/sys/net/ipv4/conf/all/arp_announce echo2>/proc/sys/net/ipv4/conf/eth0/arp_announce echo1>/proc/sys/net/ipv4/conf/all/arp_ignore echo1>/proc/sys/net/ipv4/conf/eth0/arp_ignore Add vip ifconfiglo:0192.168.1.10broadcast192.168.1.10 netmask255.255.255.255

follows: ! Configuration File for detail {icationication_email {# acassen@firewall.loc # failover@firewall.loc # sysadmin@firewall.loc57674891 # 57674891@qq.com @ qq.com # contact} icationication_email_from smtp_server smtp.qq.com route 30 router_id LVS_DEVEL} vrrp_instance VI_1 {state MASTER # from direct BACKUP. Interface eth0 virtual_router_id 51 priority 100 # The master database is 100, which must be smaller than the master database, 90 advert_int 1 authentication {auth_type PASS # passwo

Dr. Shen Yi's notes on PHP devil training (8) and Shen Yi's devilCreate a template file: In this lesson, the teacher led us to create a TEMPLATE. According to the teacher's instruction, we hope to write such a code: 1. For example, I define a variable $ name = ''; 2. Then I read a template. 3. Then I set some "display Formats" in this template ). 4. After loading the template, you can directly replace it with the preceding variables. 1. Create an inde

Http://antsw.blog.51cto.com/936097/214975 this article from the "mountain twist" blog Node1: 192.168.1.253Node2: 192.168.1.254VIP: 192.168.1.250Environment centos5.2 (I used two machines here)1. Install ipvsadmYum-y install ipvsadm2. Install keepalived[Root @ node1 ~] # Wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz[Root @ node1 ~] # Tar zxvf keepalived-1.1.15.tar.gz[Root @ node1 ~] # Cd keepalived-1.1.15[Root @ node1 keepalived-1.1.15] #. /configure -- prefix =/-- mandir =/us

kernel's Virtual server table. is to add a new virtual server. -E--edit-service edits a virtual server record in the Kernel Virtual server table. -D--delete-service Deletes a virtual server record from the kernel Virtual server table. -C--clear clears all records in the kernel Virtual server table. -R--restore Restore virtual Server rules -S--save save virtual Server rules, output to the-r option readable format -a--add-server add a new real server record to a record in the Kernel Virtual serve

:80-g-W 1SH!$ifconfig Virtual network card has come out eth0: 0 Link encap:ethernet : 0C::CC: One: E7 inet addr:192.168. 1.100 bcast:192.168. 1.100 Mask:255.255. 255.255up broadcast RUNNING multicast MTU: Metric:1Ipvsadm-Ln more out of a vipip Virtual Server version1.2.1(size=4096) Prot localaddress:port Scheduler Flags-remoteaddress:port Forward Weight activeconn inactconntcp192.168.1.100: theRR-192.168.1.115: theRoute1 0 0-192.168.1.116: theRoute1

In the previous article, we talked about the configuration of the NAT mode of the LVS cluster, which is the configuration of Dr Mode today. Case requirements: Director on the network card eth0:0 configuration VIP address, eth0 configuration dip address, extranet users through the switch access to Director VIP, and then director through the DIP will send the request to two units Realserver : Realserver1 and Realserver2, then two realserver to the stor

#!/bin/bash vip=192.168.19.254 rs= (192.168.19.2 192.168.19.3) dip=192.168.19.1 Lvsstart () {if [!-e/sbin/ipvsadm ];then echo "error!! Please install Ipvsadm tool ' else ifconfig eth0:1 $VIP netmask 255.255.255.0 broadcast $VIP up Route add-host $VI P Dev eth0:1 echo 1 >/proc/sys/net/ipv4/ip_forward ipvsadm-a-t $VIP: 80-s RR ipvsadm-a-t $VIP: 80-r ${ Rs[0]}-G ipvsadm-a-T $VIP: 80-r ${rs[1]}-G echo "LVs already running ..." fi} lvsstop () {ipvsadm-c Ifconfig eth0:1 down echo "LVs Stop"} RS ()

install-y libaio-devel wget https://launchpad.net/codership-mysql/5.6/5.6.16-25.5/+download/mysql-5.6.16_ wsrep_25.5-linux-x86_64.tar.gz Tar xf mysql-5.6.16_wsrep_25.5-linux-x86_64.tar.gz mv Mysql-5.6.16_wsrep_ 25.5-linux-x86_64/usr/local/mysql useradd-s/sbin/nologin-m mysql mkdir/data/mydata ./scripts/mysql_install_db--no-defaults--datadir=/data/mydata--user=mysql chown-r mysql.mysql/data/mydata/ chown Root.mysql/usr/local/mysql Cp/usr/local/mysql/support-files/mysql.server/etc/init.d/mysqld5.

#! /Bin/bash# Create lvs dr or tunl realservr scripts.# Chenjian 2011-09-23VIP_LIST = "192.168.116.20 192.168.116.21"USAGE = "Usage: $0 {start | stop | status} {dr | tunl }"NAME = tunlNUM = 0If [-z $1]ThenEcho $ USAGEExit 2FiACTION = 'echo $1 | tr A-Z a-Z'If! [$1 = status]ThenIf [-z $2]ThenEcho $ USAGEExit 2FiFiTYPE = 'echo $2 | tr A-Z a-Z'Case "$1" inStart)If [$ TYPE =

Abstract: "Five monkeys divide Peach problem" is a very famous in and out of the interesting math problem. The simple method of calculating this type of problem has plagued some large physicists and mathematicians. Dr. T.D. Lee a lecture at the Chinese University of Science and Technology, and also specifically mentioned this question, Through the analysis of this problem, this paper deduces the simplest general solution Formula y=a (a/m) n-1-db/c,

Basic Introduction:The director server of LVS cluster has three configuration modes, namely TUN, NAT, DR, and can load all kinds of services.The Balance server cluster system is comprised of three components, which are the most front-end load balancing layer (loadThe server cluster layer (server Array) and the bottommost data-sharing storage tier (shared Storage).The IP load balancing technology of LVS is realized by Ipvs module, Ipvs is the core soft

The LVS architecture can be logically divided into the scheduling layer (Director), the server cluster layer (Real server), and the shared storage tierLVS can be divided into three modes of operation :NAT (The scheduler changes the requested destination IP as the VIP address to the IP of the real server, the returned packets are also routed through the scheduler, and the scheduler then modifies the source address to the VIP) to rely on the firewallTUN (The scheduler encapsulates the requested pa

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 support the LVS function module, but since the Linux2.4 kernel, the various functions of LVS have been built-in, without any patching of the kernel, and the functions provided by LVS can be used directly.LVS is

Lvs DR mode is short for implementing Server Load balancer. LVS is a Linux Virtual Server. To adapt to LVS, you can build a high-performance Server Load balancer system. LVS has three modes: LVS/NAT (Network Address Translation), LVS/TUN (IP tunnel), LVS/DR (direct routing), usually in DR mode, the following describes how to configure

Dnat principle, multi-objectiveDR: Direct RoutingTUN: TunnelLVs Scheduling Method:There are 10 types, as follows:Fixed scheduling, also known as static scheduling, there are four kinds:RR: Round call, pollingWrr:weight, weightedSh:source hash, source address hashDH: Target Address HashThere are six types of dynamic scheduling methods:LC: Minimum ConnectionActive*256+inactiveWho's small, pick whoWLC: Weighted Minimum connection(active*256+inactive)/weightSED: Shortest expected delay(active+1) *2

LVS-DR + keepalived Dual master configuration The network topology diagram is as follows Prepare the Realserver (RS server) configurationHere RS prepares HTTP service as an application verification, in the actual production of two RS servers should have the same resources to achieve redundancy. In order to test the validation, deliberately set the access resources to different, to facilitate verification. Run the Yum instal

Lvs-dr (Virtual Server via Direct Routing) principle Description and configuration use case Lvs-nat (Virtual Server via NAT) principle description and configuration use case How does the LVS-DR mode work? The user Requests Load Balancing server (Linuxdirector), when the data packet (data frame) arrives at the load balanced server, the load balancing server chooses a real server according to the dispa