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# Web Server Component Using Azure Virtual Machine

This example provisions a configurable number of Linux web servers in an Azure Virtual Machine, and returns the
resulting public IP addresses. This example uses a reusable [Pulumi component](
https://www.pulumi.com/docs/intro/concepts/resources/#components) to simplify the creation of new virtual machines. By
defining a `WebServer` class, we can hide many details (see [here](./webserver.go) for its definition).

## Prerequisites

- [Node.js](https://nodejs.org/en/download/)
- [Download and install the Pulumi CLI](https://www.pulumi.com/docs/get-started/install/)
- [Connect Pulumi with your Azure account](https://www.pulumi.com/docs/intro/cloud-providers/azure/setup/) (if your `az` CLI is configured, no further changes are required)

## Running the App

1.  Create a new stack:

    ```
    $ pulumi stack init dev
    ```

1.  Configure the deployment. The username and password here will be used to configure the Virtual Machine. The
    password must adhere to the [Azure restrictions on VM passwords](
    https://docs.microsoft.com/en-us/azure/virtual-machines/windows/faq#what-are-the-password-requirements-when-creating-a-vm).

    ```
    $ pulumi config set azure:location westus  # any valid Azure region will do
    $ pulumi config set username webmaster
    $ pulumi config set password <your-password> --secret
    $ pulumi config set count 5                # optional -- will default to 2 if left out
    ```

    Note that `--secret` ensures your password is encrypted safely.

1.  Login to Azure CLI (you will be prompted to do this during deployment if you forget this step):

    ```
    $ az login
    ```

1.  Run `pulumi up` to preview and deploy changes:

    ``` 
    $ pulumi up
    Previewing changes:
    ...

    Performing changes:
    ...
    info: 15 changes performed:
        + 15 resources created
    Update duration: 4m27s
    ```

1.  Check the resulting IP addresses:

    ```
    $ pulumi stack output ipAddresses
    [ 40.112.181.239, ..., 40.112.181.240 ]
    ```