load balancing mode

application layer to create a load-balanced cluster that accesses data-tier data and provides access to the application to the clients in the client tier.Figure 5: a solution with a scalable application layerThis will get a standard load-balanced design. The hardware device or software running on the host assigns the virtual host name (APPSERVER20) and IP address to AppServer1, AppServer2, and AppServer3.

Load BalancingMainstream open source software: LVS, keepalived, Haproxy, Nginx and so on;OSI Layer: LVS (4), Nginx (7), Haproxy (4, 7);The Keepalived load balancing function is actually the LVSLVS Load balancer can distribute other ports than 80, such as MySQL, while Nginx only supports HTTP, https, mail;LVS Introducti

LVS Load BalancingRecently in the study server load Balancing, read some information on the Internet, found that the main software load Balancing scheme has nginx (load balancing for HT

performance should be no better.A Web application cluster configured with Apache+tomcat is a hassle to deploy, always keeping a double copy of the application, and the was cluster does not need to know how JBoss does the Web application cluster.OK, the next thing to do, and finally hope to write a tool can be completed from download to installation configuration, start, stop, restart the full automation, as well as the user interface.Resources:1. Easily implement Apache,tomcat clustering and

62, Load Balancing cluster introduction, LVS Introduction, LVS scheduling algorithm, LVS NAT mode constructionFirst, load Balancing cluster introductionMain open source software LVs, keepalived, Haproxy, Nginx, etc.The LVS belongs to 4 layer (network OSI 7 layer model), Ngin

Apache Load Balancing configuration (reverse proxy mode) This article is only suitable for EKP products, as the application cluster is the function of our own implementation, so the configuration here may be inconsistent with the configuration of other products. We currently use Apache as a front-end load-balanced forw

eventually sends the request to the application server;6. After the application server completes the user request, it is returned directly to the user through the reverse proxy server, without having to pass the LVS server. 3 , IP aliasesThe above is the situation from the user's point of view of the data, in this case, will involve a technology, that is IP aliases. It is important for the implementation of direct routing load

...........$IPVSADM -C$IPVSADM -A -t 192.168.147.144:80 -s wlc............. Browser access to 192.168.147.144, multiple visits several times to view the results of differences [[emailprotected] ~]# ipvsadm -lnIP Virtual Server version 1.2.1 (size=4096)Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConnTCP 192.168.147.144:80 wlc -> 192.168.0.132:80 Masq 1 0 0 -> 192.168.0.133:80

-Xiptables -t nat -A POSTROUTING -s 192.168.133.0/24 -j MASQUERADE#director设置ipvsadmIPVSADM=‘/usr/sbin/ipvsadm‘$IPVSADM -C$IPVSADM -A -t 192.168.147.144:80 -s wlc -p 3$IPVSADM -a -t 192.168.147.144:80 -r 192.168.133.132:80 -m -w 1$IPVSADM -a -t 192.168.147.144:80 -r 192.168.133.133:80 -m -w 1Nat Mode effect testInstallation of Nginx on both RSSet two RS homepage, make a distinction, that is to say, directly curl two RS IP, get different resultsBrows

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 adding Ro

: Ensure the same request is distributed to the same RS)#因为添加-p option will affect the test effect, so this parameter is not added here (note: The time cannot be set to 0)$IPVSADM-T 192.168.75.128:80-r 192.168.8.134:80-m-W 1$IPVSADM-T 192.168.75.128:80-r 192.168.8.135:80-m-W 1#-a:=add, adding Rs;-r in NAT Schema: Specify IP;-M for RS: Specify the LVS mode as NAT (Masquerade)#-w:=weight, assigning weightsExecute the script:[Email protected] ~]# sh/usr/

Introduction to load Balancing clusters? Mainstream open source software LVs, keepalived, Haproxy, Nginx, etc.? where LVs belongs to Layer 4 (Network OSI 7 layer model), Nginx belongs to 7 layer, Haproxy can be considered as 4 layer, also can be used as 7 layerThe Keepalived load balancing function is actually LVS.? LV

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

Ipvsadm load Balancing on Ubuntu (DR Mode, 80 ports for example)Description: 3 Servers, IP: 10.0.1.2 10.0.1.3 10.0.1.4 Virtual ip:10.0.1.10Ipvsadm Server (10.0.1.2)$ sudo apt-get install Ipvsadm$ sudo ifconfig eth0:0 10.0.1.10 netmask 255.255.255.255 Broadcast 10.0.1.10$ sudo ip a (see if the settings are in effect)$ sudo route add-host 10.0.1.10 Dev eth0:0$ sudo

, number of databases and connections--rate Viewing connection RatesConfiguration of multiple real server side:1 Configuring the IP addressVim/etc/sysconfig/network-scripts/ifcfg-eth02 Modifying the NIC modeModify the NIC mode to the same network segment as the dispatcher Vmnet4 communication is normal at the same address segment3 Opening httpd ServiceDownload Web server software to open the httpd processYum Install-y httpdService httpd RestartYou can

Introduction to load Balancing clustersMain open source software LVs, keepalived, Haproxy, Nginx, etc.The LVS belong to 4 layer (network OSI 7 layer model), Nginx belongs to 7 layer, Haproxy can be considered as 4 layer, can also be used as 7 layerKeepalived Load balancer is actually the LVS LVS this 4-layer load balan

, Configuration keepalived#配置A服务器 #配置B服务器3. #/etc/keepalived/change_mysql.sh script content for strong kill keepalived process4, #配置好后开启两服务器 keepalived#/etc/init.d/keepalived Start #ps aux | grep keepalived5. View status# IP A keepalived work mechanism is: every 2 seconds to check the status of Real_server monitoring, once the database down, the VIP will be transferred to another stage, so that the rapid failover of the fault, the user in the VIP connection through the basic can remain connected

Environment: Virtual machine: VMware Workstation operating system: CentOS 5.5 First, KEEPALIVED+LVS-DR mode configuration high available load balancing The topology is as follows: Second, server IP configuration information 1. IP_LB Host (Master): 2.ip_lb_2 Host (Backup) 3.WEB1 Host 4.WEB2 Host See if Ipvsadm software is available separately in master and

First, load Balancing cluster introductionIi. introduction of LVSLVS NAT ModeAccess to NAT mode is not too large, usually more than 10 or 10 units or lessIn NAT mode, only the distributor needs to configure a public IP, and then the Distributor and RS only need to set the network IPLVS IP tunnel modeA virtual tunnel be

The Linux LVs load Balancing is mainly used to improve the processing power of the server, improve the corresponding ability of the server, improve the concurrency processing ability, and reasonable resource allocation. Address translation: referred to as NAT mode, similar to the firewall of the private network structure, the