# Microsoft DNS Server on Microsoft Windows Server

This provider updates a Microsoft DNS server.

It interacts with the server via PowerShell commands. As a result, DNSControl must be run on Windows and will automatically disable itself when run on non-Windows systems.

DNSControl will use `New-PSSession` to execute the commands remotely if `computername` is set in `creds.json` (see below).

## Caveats

* Two systems updating a zone is never a good idea. If Windows Dynamic DNS and DNSControl are both updating a zone, there will be unhappiness. DNSControl will blindly remove the dynamic records unless precautions such as `IGNORE*` and `NO_PURGE` are in use.
* This is a new provider and has not been tested extensively, especially the `pssession` feature.

## Running on Non-Windows systems

Currently this driver disables itself when run on Non-Windows systems.

It should be possible for non-Windows hosts with PowerShell Core installed to execute commands remotely via SSH. The module used to talk to PowerShell supports this. It should be easy to implement. Volunteers requested.

### Configuration

To use this provider, add an entry to `creds.json` with `TYPE` set to `MSDNS` along with other settings:

* `dnsserver`: (optional) the name of the Microsoft DNS Server to communicate with.
* `pssession`: (optional) the name of the PowerShell PSSession host to run commands on.
* `psusername`: (optional) the username to connect to the PowerShell PSSession host.
* `pspassword`: (optional) the password to connect to the PowerShell PSSession host.

Example:

{% code title="creds.json" %}

```json
{
  "msdns": {
    "TYPE": "MSDNS",
    "dnsserver": "ny-dc01",
    "pssession": "mywindowshost",
    "psusername": "mywindowsusername",
    "pspassword": "mysupersecurepassword"
  }
}
```

{% endcode %}

An example DNS configuration:

{% code title="dnsconfig.js" %}

```javascript
var REG_NONE = NewRegistrar("none");
var DSP_MSDNS = NewDnsProvider("msdns");

D("example.com", REG_NONE, DnsProvider(DSP_MSDNS),
      A("test", "1.2.3.4")
)
```

{% endcode %}