Microsoft Azure Series IX implements virtual machine load balancing based on IaaS cloud services

If you need to load balance a different virtual machine under a cloud service, you can forward the message of public port through load balancing to each VM, thus enabling automatic load balancing of the request.

The specific topologies are as follows:

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We can set up 80-port load balancing on the two virtual machines that we created earlier.

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Note: Azure's Load balancer currently supports only four tiers, and cannot retain the session.

The algorithm for load balancing is set up in Azure and cannot be modified. The algorithm relies mainly on five tuples (source IP, source port, destination IP, destination port, protocol type).

Azure virtual Machine By default, only RDP ports and PowerShell ports are turned on, and the other ports are turned off.

To test, we install and open the Web service for 2 virtual machines and add a 80 port endpoint.

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Install Web service, second set

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Test the first Web service, normal!

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The second Web server.

(Note: In order to differentiate the effect, 2 Web page content is set to different, the actual situation should be the same)

First add an endpoint to the first virtual machine and create a load Balancing cluster

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Click "Add"

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Add stand-alone endpoints

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Specify the endpoint name "HTTP", protocol TCP, public port 80, private port 80, tick "Create load Balancing cluster"

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Set load Balancing cluster name Nlb-http, probe protocol TCP, probe port and interval, keep default

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The first virtual machine endpoint creation is complete,

Switch to the second virtual machine

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End point Page

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Add to

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Select Add endpoint to load Balancing cluster "Nlb-http"

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Set endpoint name HTTP, remaining default

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The 2nd virtual machine endpoint is added complete.

Start testing below

Find a local computer, we use 2 browser chrome and IE, simulate 2 user access, the effect is as follows:

Ie

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Chrome

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The test is complete.

The rules for Azure load Balancer (load balancer) are composed of five features of the source IP, source port, destination IP, destination port, protocol type

Reference: http://azure.microsoft.com/blog/2014/04/08/microsoft-azure-load-balancing-services/

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The latest azure Load balancer can modify the rules to change to 2 features (source ip,destination IP) or 3 features (source IP, Destination IP, Protocol). This is the same client-initiated request that points to the same Azure destination server. In this way, you can keep the session. As shown in the following:

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Microsoft Azure Series IX implements virtual machine load balancing based on IaaS cloud services