> For the complete documentation index, see [llms.txt](https://docs.realmjoin.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.realmjoin.com/dev-reference/simulating-a-runbook-environment.md).
# Simulating a Runbook Environment
To develop new runbooks, you might need to enable RealmJoin.RunbookHelper to authenticate as if you were running inside a Runbook.
## Overview
### Create an Application Registration
We create an Azure Application Registration to simulate the application-style signin to Microsoft Entra.
Create an App Registration
### Grant Permissions
We will grant the same permissions as the managed identity would have. We will use the same [AppRoleGranter Toolkit](https://github.com/hcoberdalhoff/approle-and-directoryrole-granter) for this purpose.
Replace `{AppRegObjectId}` with the object ID of your application registration.
```powershell
git clone https://github.com/hcoberdalhoff/approle-and-directoryrole-granter.git
cd "approle-and-directoryrole-granter\RealmJoinVnext"
. .\AllInOne.ps1 -appRegObjectId "{AppRegObjectId}"
```
### Create and Upload a Dev-Certificate
See [here ](https://github.com/realmjoin/RealmJoin.RunbookHelper/blob/main/DevCertificates.ps1)for a sample on how to create a RunbookHelper Dev-Certificate. Replace `{Variables}` accordingly.
The `{AppID}` refers to the Application Regsitrations App / Client ID.
If you don't have a specific subscription ID, just use a default subscription from your tenant. (It doesn't matter in most cases.)
```powershell
New-SelfSignedCertificate -Subject 'CN=AzureRunAsConnection, OU={AppID}, DC={TenantID}, O={SubscriptionID}' `
-CertStoreLocation "cert:\CurrentUser\My" -NotAfter (Get-Date).AddYears(10) -KeySpec Signature | `
Export-Certificate -FilePath "AzureRunAsConnection.cer"
```
You will get a file `AzureRunAsConnection.cer` that you upload to the Application Registration secrets.
{% hint style="info" %}
If you want to serve multiple apps / environments, you can replace the default "AzureRunAsConnection" in`CN=AzureRunAsConnection` with a custom name when creating the certificate for that environment.
You can then select which the environment/certificate (e.g. "OtherEnv") to connect using `Connect-RjRbGraph -AutomationConnectionName "OtherEnv"`
This way you can access multiple environments from the same machine.
{% endhint %}
Certificate upload
### Usage
Just use `Connect-RjRbGraph` to authenticate to the app.
Make sure to remove older Dev-Certificates using mmc.exe from your set of personal certificates if present to avoid conflicts/login failures.
---
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