Failure phenomena:When the client accesses the VIP, there is no access, and the view log information is displayed as follows:Kernel:IPVS:RR:no Destination AvailableKernel:IPVS:RR:no Destination AvailableKernel:IPVS:RR:no Destination Available。。。。。。There are about two reasons for online inquiry1, Ipvs RR module is not installed, after the Lsmod |grep RR display has been installed, excluded.2, keepalived all the server port service did not start, after
use. After receiving a packet whose destination address is VIP and whose destination MAC address is the MAC address of the Server Load balancer, the Server Load balancer implements the Server Load
58.251.62.141 in the client browser to send an http request to 58.251.62.141.
2. The Load Balacer Internet (eth0) receives the request
3. IPVS dynamically selects a server and encapsulates the request packet in another IP packet
4. Load Balacer's Intranet (eth1) sends the encapsulated IP Message to the Real Server
5. The Real Server Intranet (eth1) receives the IP packet sent by
to 0 when testing the load balancer for normal polling, so you can easily see
Tcp_check {: note Tck_check and {There is a space between, forget to play this space, may appear later with the Ipvsadm view, some RS can not see
You can simply copy the above code and put it on your machine, but don't forget to change the format, because we're using the window machine to copy it, so on Linux we need to c
Build a mysql Server Load balancer and a high-availability environment and a mysql Server Load balancer
Objective: To use two hosts to achieve Mysql load balancing and redundancy, and achieve dual-master-slave mutual backup;
Environment: rhel5.8, mysql-5.0.77, keepalived-1.2
Server Load balancer principles and practices part 3 basic concepts of Server Load balancer-network Basics
SeriesArticle:
Server Load balancer: requirements of Server Load
Server Load balancer II-Basic knowledge of Server Load balancer
In the previous article, we have been talking about the knowledge around Server Load balancer. Don't worry about it, and you can't eat hot tofu. A little bit every
Both LVS and Nginx can be used as multi-host load solutions. They have advantages and disadvantages. in the production environment, you need to analyze the actual situation and make use of it.First of all, I would like to remind you that technology is not a cloud, and my cloud is your cloud. At the same time, we should not be too conservative, too confident in the old method and wait for others to help you with the advance test. It is a good habit to
Haproxy configuration for Server Load balancer and haproxy configuration for Server Load balancerCommon Open-Source Software load balancers include Nginx, LVS, and Haproxy. Comparison of three major software load balancers (LVS Nginx VS Haproxy)
I. LVS:1. Strong
The IIS Server Load balancer ARR routes requests to the ARR server and the processing server. The Server Load balancer arr
. Net web uses the iis arr (Application Request Route) technology to achieve high web performance, high reliability, scalability, and load balancing. Fo
Nginx Server Load balancer configuration instance details, nginx Server Load balancer instance
First, let's take a brief look at what Server Load balancer is. Simply understanding what it means literally can explain that N servers
The server Load balancer described in this article is used to balance client requests among multiple nginx processes. Note the difference between Server Load balancer and client requests on multiple backend servers.
The problem of Server Load
Apache + Tomcat server Load balancer configuration and tomcat server Load balancer
Apache + Tomcat server Load balancer ensures high availability and system performance, which is achieved through communication between Apache and
Five Policies for configuring Server Load balancer using nginx in the production environment: nginx Server Load balancer
Nginx upstream currently supports five allocation methods1. Round Robin (default)
Each request is distributed to different backend servers one by one in chronological order. If the backend servers ar
Nginx Server Load balancer transmits the parameter method to the backend (the backend is also an nginx server), and nginx Server Load balancer
A website uses nginx for load balancing and multiple nginx servers at the backend.
Encountered a problem, when it is used as SSL sup
Common Parameters and basic usage of ipvsadm In the Server Load balancer cluster, and ipvsadm In the Server Load balancer Cluster
----
Fixed Scheduling Rr: Argument
Wrr: weighted argumentWeight, weighted
Sh: source hash, source address hash
Dynamic SchedulingLc: Minimum LinkActive * 256 + inactiveWlc: weighted least Li
requirements, in addition, line upgrades are too expensive or even difficult to implement. In this case, we can consider using the trunking technology.
Link aggregation technology (Layer 2 load balancing) uses multiple physical links as a single aggregation Logical Link. network data traffic is shared by all physical links in the aggregation Logical Link, this increases the capacity of the link logically so that it can meet the demand for increased b
Cluster service and who is the backend real server
Iii. related Terms of LVS
Ds:director Server, which refers to the front-end load balancer node.
Rs:real server, backend real work server.
VIP: An IP address that is directed externally to a user request as the target of a user request.
Dip:director Server IP, front-end
After configuring Nginx, when accessing Tomcat, Tomcat displays such as:
From this state can be seen, guess is CSS and JS these files are not loaded.
In addition, access to the pages deployed on the Tomcat project is the same, with different nginx accesses to the project under Tomcat such as:
Through Nginx as a proxy server, access to the page is like this:
These conditions are obviously due to the server through Nginx as load
Detailed description of LVS Server Load balancer cluster service establishment
I. LVS Overview
1. LVS: Linux Virtual Server
Layer-4 Switching (Routing): forwards request packets to a server in the backend host Cluster Based on the target IP address and target PORT (based on Scheduling Algorithm );
Load Balancing at the application layer cannot be achieved
Lvs (al
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