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POAzure LoadBalancerProbe Responses being ignored
 

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    <p>I have defined a custom LoadBalancerProbe for my webrole as follows</p> <p><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;ServiceDefinition name="CloudService" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" schemaVersion="2013-03.2.0"&gt; &lt;LoadBalancerProbes&gt; &lt;LoadBalancerProbe name="MyProbe" protocol="http" intervalInSeconds="15" path="/api/ping" port="80" timeoutInSeconds="30" /&gt; &lt;/LoadBalancerProbes&gt; &lt;WebRole name="TestApp" vmsize="Small"&gt; &lt;Sites&gt; &lt;Site name="Web"&gt; &lt;Bindings&gt; &lt;Binding name="Endpoint1" endpointName="Endpoint1" /&gt; &lt;/Bindings&gt; &lt;/Site&gt; &lt;/Sites&gt; &lt;Endpoints&gt; &lt;InputEndpoint name="Endpoint1" protocol="http" port="80" localPort="80" loadBalancerProbe="MyProbe"/&gt; &lt;/Endpoints&gt; &lt;Imports&gt; &lt;Import moduleName="Diagnostics" /&gt; &lt;Import moduleName="RemoteAccess" /&gt; &lt;Import moduleName="RemoteForwarder" /&gt; &lt;/Imports&gt; &lt;/WebRole&gt; &lt;/ServiceDefinition&gt; </code></p> <p>When in Azure I have 2 instances. I have enabled trace.axd and can see the load balancer calling the ping method, so that is definitely happening.</p> <p>I can also see my "503" responses (Server Unavailable) in my test app when I want my instance to appear down (I change a config setting on the instance). I can see custom HTTP Headers from the load balancer <code>X-MS-LB-MonitorStatus Down</code>.</p> <p>When I use a Curl request to access the load-balanced url, it always returns the correct results (If I have set an instance to return 503 rather than 200, it does not appear in the response results).</p> <p>When I use a browser however (in this case Chrome) I can still get results back from the instance that is supposed to be down (i.e. the instance was available, I disable it, then additional calls to the load balanced url still resolve to the "disabled" instance).</p> <p>I can confirm the actual instances that resolved each request using trace.axd information</p> <p>I'm struggling to believe that azure is doing load balancing properly here.</p> <ol> <li>Why does the browser continue to be able to access an instance that is supposedly out of rotation? </li> <li>Why does curl "always get it right"?</li> </ol>
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    1. USPaul Devenney
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