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Worker Role Detailed

Posted by Paul on October 14, 2011


In this article we can summarize the points on Worker role deployed in previous article.

Virtual Machine Size

The virtual machine size provides the resource capacity of the virtual machine. The parameters varying with virtual machine size are:

  • CPU Speed
  • Memory (RAM)
  • Instance Storage (Hard Disk)
  • I/O Performance

The sizes for virtual machine are:

  • Extra Small
  • Small
  • Medium
  • Large
  • Extra Large

The cost of billing will be varying depending on the virtual machine size.

The ServiceDefinition.csdef file can be used to specify the VM size.

<?xml version=”1.0″ encoding=”utf-8″?>

<ServiceDefinition name=”WorkerRoleExample” xmlns=”http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition”&gt;

<WorkerRole name=”WorkerRole1″ vmsize=”Small”>

<Imports>

<Import moduleName=”Diagnostics” />

</Imports>

</WorkerRole>

</ServiceDefinition>

Instance Count

The number of instances of the Worker role can be specified using the instance count option. The number of instances will be managed by a Load Balancer automatically by the cloud.

The ServiceConfiguration.cscfg file can be used to specify the instance count.

<?xml version=”1.0″ encoding=”utf-8″?>

<ServiceConfiguration serviceName=”WorkerRoleExample” xmlns=”http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration&#8221; osFamily=”1″ osVersion=”*”>

<Role name=”WorkerRole1″>

<Instances count=”1″ />

<ConfigurationSettings>

<Setting name=”Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString” value=”UseDevelopmentStorage=true” />

</ConfigurationSettings>

</Role>

</ServiceConfiguration>

Locating the files

From the solution explorer we can locate the files as shown below:

clip_image002

Deleting the Worker Role

As mentioned in the previous article, any computing hours excess of the trial limit will be charged. So we need to ensure that the instances are stopped and deleted. The steps are depicted below:

Step 1: Stopping an Instance

Sign in to the Windows Azure Portal, click the Hosted Services link to vie the hosted services and click Stop from the toolbar.

The order of clicking is depicted as sequence.

clip_image004

Step 2: Deleting an Instance

Once the instance is stopped, click on the Delete button to delete the instance. (This is for demonstration and one may keep the instance if it is needed in future)

clip_image006

On clicking the Delete button you will be prompted with a confirmation dialog.

clip_image008

Click on the Yes button for proceeding with the Delete operation. Now you can see the status being changed to Deleting…

clip_image010

After the operation is completed, the above entries are removed from the list. So it confirms the Delete operation.

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