This topic dtells you how to configure your .NET Framework apps for use with the HWC buildpack and how to push your .NET Framework apps to VMware Tanzu Application Service for VMs [Windows].
Using the HWC buildpack requires deploying Windows cells with TAS for VMs [Windows].
The HWC buildpack supports the following common app types by default:
For information about deploying different types of .NET apps, follow the links in the following table:
|Type of .NET App||Buildpack|
|.NET Core pushed to Linux stack||.NET Core|
|.NET Core pushed to Windows stack||Binary|
The HWC buildpack provides a runtime server that uses the Hosted Web Core API for running .NET Framework applications in Windows Server containers. For more information, see Hosted Web Core API Reference in the Microsoft documentation.
The HWC buildpack provides access to .NET Framework 4.5.1 and later, made available by the Windows root file system (rootfs).
Before you push your first app using the HWC buildpack, see the Getting Started guide in the .NET Cookbook.
HWC relies on
applicationHost.config configuration files for configuring the .NET applications.
Web.config files work immediately with TAS for VMs [Windows], but with the following constraints:
In addition, the Shadow Copy Setting, and Dynamic and Static HTTP Compression
Web.config settings can be customized as needed.
The HWC buildpack includes a default configuration for the
applicationHost.config, similar to IIS.
Before you push your app for the first time, add a global error handler to receive log information from your app if it crashes on startup.
To configure a global error handler that logs to
stdout, see Application Error Handling in the .NET Cookbook.
Follow these steps to push your application:
Build your HWC app in Visual Studio.
On the command line, go to the directory containing the app files.
To push your HWC app, run the following
cf push command:
cf push APP-NAME -s windows -b hwc_buildpack
APP-NAME is the name you want to give your app.
$ cf push my-app -s windows -b hwc_buildpack Creating app my-app in org sample-org / space sample-space as email@example.com... OK ... requested state: started instances: 1/1 usage: 1 GB x 1 instances urls: my-app.example.com
Confirm your application is running by going to your app’s URL in the push command output. In the previous example,
my-app.example.com is the URL of your app.
You can use the following features with HWC buildpack:
With context path routing you can implement multiple apps to share the same route hostname. For example,
app1.example.com/app2. The context path routing feature is analogous to IIS virtual directories.
Making an application accessible under another app’s URL requires pushing both apps and applying a map-route correlation between them. To define a context path route, for example,
app1.example.com/app2, run the following commands:
To push the primary app, run the following command:
cf push TOP-LEVEL-APP-NAME -s windows -b hwc_buildpack
TOP-LEVEL-APP-NAME is your top-level app’s name.
To push the secondary app and deactivate the app’s starting and default routing, run the following command:
cf push LOWER-LEVEL-APP-NAME --no-start --no-route -s windows -b hwc_buildpack
LOWER-LEVEL-APP-NAME is the name of the lower-level app.
To map routes between the primary and secondary apps, run the following command:
cf map-route LOWER-LEVEL-APP-NAME APP-DOMAIN --hostname TOP-LEVEL-APP-NAME --path LOWER-LEVEL-APP-NAME
TOP-LEVEL-APP-NAMEis your top-level app's name.
LOWER-LEVEL-APP-NAMEis your lower-level app's name.
APP-DOMAINis your site's public domain name.
To start the secondary app, run the following command:
cf start LOWER-LEVEL-APP-NAME
LOWER-LEVEL-APP-NAME is your lower-level app’s name.
For example, the following commands define context path routing for two HWC apps,
app2 is made accessible under
$ cf push app1 -s windows -b hwc_buildpack $ cf push app2 --no-start --no-route -s windows -b hwc_buildpack $ cf map-route app2 example.com --hostname app1 --path app2 $ cf start app2
Note: HWC-hosted apps use the
VCAP_APPLICATION environment variable to read out the bound app URIs. Any context path that exists underneath the root in the app's bound route corresponds to the
Shadow Copy is a hosting option that copies assemblies for an app in the
bin directory to the app’s temporary files directory. This feature is turned off and is unnecessary for apps running under Cloud Foundry. An app can override this setting in its
The HWC buildpack implements dynamic and static HTTP compression by default. You can deactivate HTTP compression in your app’s
Dynamic HTTP compression is hardcoded at level 4. Static HTTP compression is hardcoded at level 9.
The HWC buildpack supports the URL Rewrite module. It’s preinstalled in the Windows file system.
With the HWC buildpack you can provide
.profile.bat scripts with your applications. You can use a
.profile.bat script to perform app-specific initialization tasks. For example, setting custom environment variables.
For information about configuring
.profile.bat scripts, see Configure Pre-Runtime Hooks section of Pushing an App.
A number of channels exist to assist you with using the HWC buildpack, or developing your own HWC buildpack.
HWC Buildpack Repository in GitHub: For more information about using and extending the HWC buildpack in the [HWC buildpack repository] see, (https://github.com/cloudfoundry/hwc-buildpack) in GitHub.
Release Notes: For more information about this buildpack, see HWC buildpack release page in GitHub.
Slack: Join the #buildpacks channel in the Cloud Foundry Slack community.