external load balancer

Tomcat Load balancer (MOD_JK for Apache):1, based on the Apache MOD_JK to achieve:Apache/ \Tom1 Tom2After completing the installation of two tomcat1,tomcat2, it is hoped that the load balance can be achieved, and using MOD_JK can realize the fault recovery function of the node, that is, a node problem, MOD_JK will not participate in the

Currently, popular Server Load balancer front-end servers include Apache (with mod_proxy), nginx, Lighttpd, squid, perlbal, and pound. If your domain name service provider provides DNS-level Server Load balancer, or (that is, a domain name randomly points to multiple IP addresses, and the customization is not high ). I

Nginx deploy a Web server and build a Load Balancer server with NFSFirst, build Nginxweb serverThis approach is to install Nginx with Yum, to ensure that the installation is successful before installing the Epel extension source prior to installation.650) this.width=650; "Src=" https://s2.51cto.com/wyfs02/M00/8E/EF/wKioL1jPdanStzu5AADTNzvDM1A240.png-wh_500x0-wm_ 3-wmp_4-s_827070501.png "title=" 1-1nginx bui

LVS's working mechanism and scheduling algorithm have been recorded in my previous articles. See hereThe working mechanism of LVS is similar to iptabls. Some work in the user space (ipvsadmin) and some work in the kernel space. user space: used to define some load balancing objects and policies, for example, load the persistent connection to port 80 of the TCP protocol, or

LVS Cluster has DR, TUN, Nat three configuration mode, can be the WWW service, FTP services, mail services, such as load balancing, the following through the construction of the WWW service load Balancer instance, describes the DR model based on the LVS cluster configuration.First, the configuration of Director serverThere are two ways to configure the LVS

Apache HTTP Server is selected as the front-end Server Load balancer, and two Tomcat clusters are selected at the backend. The selected configuration method is session sticky (sticky session ), this method forwards requests from the same user to a specific Tomcat server to avoid session replication in the cluster. The disadvantage is that the user only communicates with one server, if the server is down, it

1) Open the "httpd.conf" file in the "/usr/local/apache2/conf" directory and add the following configuration item at the end of the file, as shown in Figure 4-2-1. Proxyrequests OFF proxypass/balancer://mycluster/ Balancermember ajp://localhost:10009 ROUTE=TOMCAT1 Balancermember ajp://localhost:20009 ROUTE=TOMCAT2 Figure 4-2-1 Description: Where "Mycluster" is the name of the cluster, "ajp://localhost:10009 ROUTE=TOMCAT1" corresponds to the Tc6_a in

This article describes how to configure Simple Server Load balancer on Docker. The host machine is Ubuntu14.04.2LTS, two CentOS containers, Nginx for the host machine, and tomcat 7 for the two containers. The architecture is as follows: the principle of this solution is to map the host machine port and the docker container port (that is, a port accessing the host machine will be mapped to the corresponding

Since the release of this series, I have received replies from many friends! Thank you very much. At the same time, many friends have asked some questions, some of which are basic questions. Due to the time, they will not reply to them one by one. If they do not understand, I hope you will learn by yourself! Although this series is not difficult, many of the knowledge is required by default, such as the concept, principle, and Web farm of Server Load

For stress testing, the middleware uses WebLogic 816The database version is 11.1.0.6 RAC.The stress testing tool is LoadRunner 8.0. Test a single instance and RacThe load of each node in the environment. In WebLogicA multi-pool is configured on, and WebLogicThe server Load balancer policy is provided to separate the Concurrent Server

Heartbeat + LVS build a high-availability server Load balancer Cluster 1. Introduction to heartbeat: The Heartbeat project is an integral part of the Linux-HA project, which implements a high-availability cluster system. Heartbeat service and cluster communication are two key components of a highly available cluster. In the heartbeat project, the Heartbeat module implements these two functions. This cluster

]~]# ipvsadm-c[[email protected]~]# Ipvsadm-at 192.168.36.100:80-s rr[[email protected]~]# Ipvsadm-at 192.168.36.100:80-r 192.168.36.102:80-g[[email protected]~]# Ipvsadm-at 192.168.36.100:80-r 192.168.36.103:80-g[[email protected]~]# ipvsadm-l-N (2), real-server1 configuration [[email protected]~]# ifconfig lo:0 192.168.36.100 netmask 255.255.255.255[[email protected]~]# Route add-host 192.168.36.100 Dev lo:0[[email protected]~]# echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore [[email protected

Oracle RAC provides two methods to achieve load balancing. The first is pure technical means, that is, when a user connects, the node that determines based on the current load of the system to process user requests; the second type is business-oriented. Applications are divided into many services manually, and connection requests from a service are processed by a node.Let's take a look at these two methods:

synchronization strategy according to the type of SQL statement to ensure the minimization of the data synchronization cost. 3. Advantages and Disadvantages Advantages:(1) Strong extensibility: When the system to higher database processing speed, as long as simply increase the database server can be extended.(2) Maintainability: When a node fails, the system will automatically detect the failure and transfer the application of the fault node to ensure the continuous work of the database.(3) Sec

If you have experience in cluster, server load balancer, and dual-machine hot standby, you will be able to answer the question: I am using a mysql database web script written in php. If cluster, server load balancer, and dual-machine hot standby are implemented, is there an all-in-one solution? I mean, what I know now

I know what server load balancer and high concurrency should be used to solve this problem, but I don't know how to do it even though I have no experience in the concept of server load balancer and high concurrency, I searched for nginx to achieve load balancing and high con

1 overviewIn order to guarantee the stable operation of the bastion host-instruction channel, it is necessary to implement the load balance of instruction channel, and study to determine the use of LVS software.LVS is the abbreviation for Linux virtual server, that is, the Linux server, the official site is: www.linuxvirtualserver.org2 LVS ArchitectureLVS set up server cluster to achieve load balancing has

; # Fastcgi_send_timeout 300; # Fastcgi_read_timeout 300; # fastcgi_buffer_size 64k; # fastcgi_buffers 4 64k; # fastcgi_busy_buffers_size 128k; # fastcgi_temp_file_write_size 128k; # gzip on; # Gzip_min_length 1k; # gzip_buffers 4 16k; # Gzip_http_version 1.0; # gzip_comp_level 2; # gzip_types Text/plain application/x-javascript text/css application/xml; # gzip_vary on; #limit_zone crawler $binary _remote_addr 10m; Upstream tomca

/arp_ignore Echo "2">/proc/sys/net/ipv4/conf/lo/arp_announce Echo "1">/proc/sys/net/ipv4/conf/all/arp_ignore Echo "2">/proc/sys/net/ipv4/conf/all/arp_announce Sysctl-p>/dev/null 2> 1 Echo "RealServer Start OK" ;; Stop) Ifconfig lo: 0 down Route del $ SNS_VIP>/dev/null 2> 1 Echo "0">/proc/sys/net/ipv4/conf/lo/arp_ignore Echo "0">/proc/sys/net/ipv4/conf/lo/arp_announce Echo "0">/proc/sys/net/ipv4/conf/all/arp_ignore Echo "0">/proc/sys/net/ipv4/conf/all/arp_announce Ec

Recently, using Apache as a load balancer for a cluster, according to the relevant configuration, after adjusting the relevant content, the Apache httpd.conf file is adjusted. Add the following content:After adding such as content, the original normal Apache can not start!Looking at Apache's backend log error.log, we found the following:[Tue Dec 09 10:34:51 2014] [Notice] parent:received Restart Signal--res