Adding a PaaS Cloud Service (Web, Woker Role) to a Virtual Network

A PaaS cloud service, web or worker role, can be added in a Virtual Network only by changing its service configuration file (ServiceConfiguration.Cloud.cscfg).

You need to add the NetworkConfiguration node just after the Role node as follow:

<?xml version="1.0" encoding="utf-16"?>
<ServiceConfiguration xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" serviceName="MyAzureApplication" osFamily="3" osVersion="*" schemaVersion="2013-03.2.0" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration">
    <Role name="MyMvcWebRole">
        <ConfigurationSettings>
            <Setting name="Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString" value="DefaultEndpointsProtocol=https;AccountName=xxx;AccountKey=xxx" />
        </ConfigurationSettings>
        <Instances count="1" />
    </Role>
    <NetworkConfiguration>
        <VirtualNetworkSite name="myazure-vnet"/>
        <AddressAssignments>
            <InstanceAddress roleName="MyMvcWebRole">
                <Subnets>
                    <Subnet name="MainSubnet"/>
                </Subnets>
            </InstanceAddress>
        </AddressAssignments>
    </NetworkConfiguration>
</ServiceConfiguration>