Linux Server Haproxy build a Web cluster environment instance

Operating system: CentOS 6.5 haproxy software version: haproxy-1.4.24 nginx software version: nginx-1.6.2

Haproxy is a popular cluster scheduling tool, previously mentioned Nginx upstream module can also realize the load balance of the cluster, but Nginx can not perform health checks on the nodes, performance is not haproxy good

Common scheduling algorithms for load Balancing: RR (Round Robin) Polling schedule, LC (Least Connections) Minimum number of connections, and SH (source Hashing) source-based access scheduling

Case topology diagram:

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Case Environment:

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First, build Nginx server

1. Compile the installation (install Nginx on two servers respectively)

Nginx installation Method can refer to: Nginx source Installation

2. Create a test page on Nginx server 1 and start the service, notice that the firewall

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3. Create a test page on Nginx server 2 and start the service, notice that the firewall

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Production environment, two servers above the page should be the same, here in order to see the effect of load balancing, so different

Second, build Haproxy server

1. Compiling the installation

Preparation: Install Haproxy required Kit Pcre-devel, Bzip-devel

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Installing Haproxy

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Establish Haproxy profile (Create profile directory, copy haproxy.cfg files to this directory)

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2. Modify the configuration file

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3. Create a self-launching script

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4. Start the Haproxy service and pay attention to the firewall

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Third, test the Web cluster effect

1. The first time the client opens 192.168.1.60, the display is as follows:

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2. Press "F5" directly to refresh the webpage, the result is as follows:

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You can see that each time you access the server is different, so that load balancing

3. We shut down Nginx server 1

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Then continue to access 192.168.1.60 with the following results:

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Web pages can still be browsed, thus satisfying the high availability of the cluster

Linux Server Haproxy build a Web cluster environment instance