l4 switch load balancing

This article is mainly about the simplest solution--dns polling.DNS PollingMost domain name registrars support the resolution of multiple A records, in fact, this is the DNS polling, the DNS server will resolve the request in accordance with the order of a records, one by one assigned to a different IP, so that the simple load balancing is completed.Advantages Basically no cost, because often domai

The weighted polling policy (http://blog.csdn.net/xiajun07061225/article/details/9318871) for Nginx load balancing is described earlier, which is the underlying strategy for Nginx load balancing, so some of the initialization work For example, configure value dumps, and other policies can directly reuse him. You will s

0 04:37? 00:00:00 nginx:worker processroot 10342 10069 0 06:26 pts/1 00:00:00 grep nginxThen you can test if the nginx is in effect.You can launch two Tomcat in the 192.168.1.104 and 192.168.1.102 servers.And thenhttp://192.168.1.106/test/index.jspVisit a bitI put a test project under the 102 104 machine Tomcat, and there's a index.jsp file in the project.If you can access it to show that the Nginx built successfully, you can also be one of the above, such as 102 tomcat off. See

Ext.: http://ju.outofmemory.cn/entry/52165Main Nginx Load balancer: 172.26.11.99 ( keepalived configured with vip:172.26.11.101 for external use)Nginx Load Balancer: 172.26.11.100 ( keepalived configured with vip:172.26.11.101 for external use)Back-end Web server:172.26.11.73172.26.11.74The key nginx configurations for 172.26.11.99 and 172.26.11.100 are as follows:Vim/etc/nginx/nginx.conf#################..

subnet problem Through these articles, including this blog, you have learned the functions, principles, features and working modes of Nginx and LVS respectively. In the following article, we will combine these load layer technologies to introduce the installation and configuration of Nginx + keepalived, LVs + keepalived, LVs + keepalived + nginx.(I this Month "Perseverance" award has been received, laugh one: haha ha) Copyright NOTICE: This arti

Description Operating system: CentOS 5.X 64-bit Web server: 192.168.21.127, 192.168.21.128 Sites: Bbs.111cn.net and Sns.111cn.net deployed on two Web servers To achieve the purpose: Add two servers (main main mode) to achieve Web server load balancing through haproxy+keepalived Architecture Planning: Haproxy server: 192.168.21.129, 192.168.

PrerequisiteAdd a new NIC to the two Exchange servers as the Heart network CAS IP Heart Network 192.168.1.15 192.168.200.2 192.168.1.16 192.168.200.3 NLB cluster virtual IP 192.168.1.28 To configure server network information: 650) this.width=650; "title=" clip_image002 "style=" border-top:0px; border-right:0px; Background-image:none; border-bottom:0px; padding-top:0px; padding-l

I. Environmental planning650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/73/53/wKiom1X6SEax6HlpAAEImIcTpPA588.jpg "title=" planning. png "alt=" Wkiom1x6seax6hlpaaeimictppa588.jpg "/> Operating system: CentOS6.5 x86_64 Kernel version: 2.6.32-504.el6.x86_64 Nginx Version: nginx-1.8.0-1.el6.ngx.x86_64 Keepalived version: keepalived-1.2.19 Front-end dual Nginx+keepalived,nginx reverse proxy to back-end tomcat cluster to achieve

.jpg "title=" h3.jpg "alt=" wkiom1sbuastgl02aau2loofbzs748.jpg "/> After the test Master haproxy hangs, whether to switch#killall HaproxyAfter looking at the keepalived log information, found that the master has been stopped according to the script, and the VIP began to drift650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/54/6B/wKioL1SBulaDv-RTAAEvuh5mw14842.jpg "style=" float: none; "title=" k4.jpg "alt=" Wkiol1sbuladv-rtaaevuh5mw14842.jp

# ln-s/usr/src/kernels/2.6.18-53.el5pae-i686/ /usr/src/linux # TAR-XZVF ipvsadm-1.24.tar.gz # CD ipvsadm-1.24 # make # make install # CP ipvsadm/sbin/ 3. Configure virtual IP services and load Balancing This column more highlights: http://www.bianceng.cnhttp://www.bianceng.cn/Servers/zs/ To 192.168.91.10 (LVS host) as a LVS host, for the host network card configuration of dual IP, o

now the part of the theory that encounters complex realities. We have come to the point that the operating system considers the "best" not always equal to the "optimal" that the program Ape thinks. We have observed that, in exceptional cases, most connections are undertaken by two or three processes-especially Linux and Solaris systems.From the operating system perspective, this makes sense: context switching (suspending a process and then reactivating another process) is a fairly resource-inte

Tags: haproxy mysql1. Installation# yum Install Haproxy2. Modify the configuration# vim/etc/haproxy/haproxy.cfgConfigured as followsglobaldaemon nbproc1pidfile/var/run/ haproxy.piddefaultsmodetcp #默认的模式mode {tcp|http|health},tcp is 4 layer, HTTP is 7 layer, health will only return OK retries3 #两次连接失败就认为是服务器不可用, you can also set option by the rear redispatch #当serverId对应的服务器挂掉后, force directed to other healthy servers optionabortonclose #当服务器负载很高的时候, Automatically end the current queue process

10Nb_get_retry 3Delay_before_retry 3Connect_port 8888}}Real_server 192.168.1.107 8888 {#指定real_server2的ip地址Weight 3 #配置节点权重Tcp_check {Connect_timeout 10Nb_get_retry 3Delay_before_retry 3Connect_port 8888}}}Save Exit,Open keepalived ServiceService keepalived StartView status Ipvsadm-l-NConfigure LVS from the server (another LVS)Apt-get Install keepalivedThe configuration from the server is roughly the same as the primary server, to change the state from master to backup in keepalived.confChange

frequent exchanges, and the loss of response can only restart the server.L Low Costbuy F5 big-IP netscaler hardware load balancer switch Hundreds of thousands ofNginx based on BSD Open source protocol free, commercially availablel support rewrite rewrite rulesability to distribute HTTP requests to different back-end server groups based on domain names and URL differencesl built-in health check functionif a

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/; Proxy_set_header Host $host; Proxy_set_header X-real-ip $remote _addr; Proxy_set_header x-forwarded-for $proxy _add_x_forwarded_for; } Location/ { Proxy_pass http://bbb.com/; Proxy_set_header Host $host; Proxy_set_header X-real-ip $remote _addr; Proxy_set_header x-forwarded-for $proxy _add_x_forwarded_for; } } Descriptionmore than 1 of the aaa.com and bbb.com in the configuration file are custom and write-free. 2 The server in upstream can write multiple,