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Applies to: 
Visual Studio 
Visual Studio for Mac
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This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
When you update a cloud service that's hosted in Azure, you might need to ensure that the virtual IP address (VIP) of the service doesn't change. Many domain management services use the Domain Name System (DNS) for registering domain names. DNS works only if the VIP remains the same. You can use the Publish Wizard in Azure Tools to ensure that the VIP of your cloud service doesn’t change when you update it. For more information about how to use DNS domain management for cloud services, see Configuring a custom domain name for an Azure cloud service.
Publish a cloud service without changing its VIP
The VIP of a cloud service is allocated when you first deploy it to Azure in a particular environment, such as the production environment. The VIP changes only if you delete the deployment explicitly or the deployment is implicitly deleted by the deployment update process. To retain the VIP, you must not delete your deployment, and you must make sure that Visual Studio doesn’t delete your deployment automatically.
You can specify deployment settings in the Publish Wizard, which supports several deployment options. You can specify a fresh deployment or an update deployment, which can be incremental or simultaneous. Both kinds of update deployment retain the VIP. For definitions of these different types of deployment, see Publish Azure Application Wizard. In addition, you can control whether the previous deployment of a cloud service is deleted if an error occurs. If you don't set that option correctly, the VIP might change unexpectedly.
Update a cloud service without changing its VIP
Create or open an Azure cloud service project in Visual Studio.
In Solution Explorer, right-click the project. On the shortcut menu, select Publish.
In the Publish Azure Application dialog box, select the Azure subscription to which you want to deploy. Sign in if necessary, and select Next.
On the Common Settings tab, verify that the name of the cloud service to which you’re deploying, the Environment, the Build configuration, and the Service configuration are all correct.
On the Advanced Settings tab, verify that the Deployment label and the Storage account are correct. Verify that the Delete deployment on failure check box is cleared, and verify that the Deployment update check box is selected. By clearing the Delete deployment on failure check box, you ensure that your VIP isn't lost if an error occurs during deployment. By selecting the Deployment update check box, you ensure that your deployment isn't deleted and your VIP isn't lost when you republish your application.
To further specify how you want the roles to be updated, select Settings next to Deployment update. Select either Incremental update or Simultaneous update, and select OK. Choose Incremental update to update each instance of your application, one after another, so that the application is always available. Choose Simultaneous update to update all instances of your application at the same time. Simultaneous updating is faster, but your service might not be available during the update process. When you are finished, select Next.
In the Publish Azure Application dialog box, select Next until the Summary page is displayed. Verify your settings, and then select Publish.
