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On this page
  • What are Azure Web Apps
  • Recommended configuration
  • Storage
  • Issues with read-only filesystems
  • Scaling
  • Web worker migrations
  • How to find the Linux App Service Logs
  • Web App secret management
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  1. Fundamentals
  2. Setup
  3. Server setup

Running Umbraco On Azure Web Apps

PreviousServer setupNextHosting Umbraco in IIS

Last updated 6 months ago

This section describes best practices with running Umbraco on Azure Web Apps

What are Azure Web Apps

They have been called a few names in the past, many people still know Azure Web Apps as Azure Web Sites.

App Service is a fully Managed Platform for professional developers that brings a rich set of capabilities to web, mobile and integration scenarios. Quickly create and deploy mission critical web Apps that scale with your business by using Azure App Service.

Umbraco will run on Azure Web Apps but there are some configuration options and specific Azure Web Apps environment limitations to be aware of.

Recommended configuration

You need to add these configuration values. E.g in a json configuration source like appSettings.json:

{
    "Umbraco": {
        "CMS": {
            "Global": {
                "MainDomLock" : "FileSystemMainDomLock"
            },
            "Hosting": {
                "LocalTempStorageLocation": "EnvironmentTemp"
            },
            "Examine": {
                "LuceneDirectoryFactory": "SyncedTempFileSystemDirectoryFactory"
            }
        }
    }
}
{
  "name": "UMBRACO__CMS__Global__MainDomLock",
  "value": "FileSystemMainDomLock",
  "slotSetting": false
},
{
  "name": "UMBRACO__CMS__Hosting__LocalTempStorageLocation",
  "value": "EnvironmentTemp",
  "slotSetting": false
},
{
  "name": "UMBRACO__CMS__Examine__LuceneDirectoryFactory",
  "value": "SyncedTempFileSystemDirectoryFactory",
  "slotSetting": false
}

Remember to add an ASPNETCORE_ENVIRONMENT variable with values Development, Staging, or Production.

The minimum recommended Azure SQL Tier is "S2", however noticeable performance improvements are seen in higher Tiers

Storage

It is important to know that Azure Web Apps uses a remote file share to host the files to run your website. This is due to the files running your website do not exist on the machine running your website. In many cases this isn't an issue. It can become one if you have a large amount of IO operations running over remote file-share.

Issues with read-only filesystems

Scaling

Web worker migrations

It's important to know that Azure Web Apps may move your website between their 'workers' at any given time. This is normally a transparent operation. In some cases you may be affected by it if any of your code or libraries use the following variables:

  • Environment.MachineName (or equivalent)

When your site is migrated to another worker, these variables will change. You cannot rely on these variables remaining static for the lifetime of your website.

How to find the Linux App Service Logs

The quickest way to get to your logs is using the following URL template and replacing {app} with your Web App name:

https://{app}.scm.azurewebsites.net/api/logstream

You can also find this in the KUDU console by clicking Advanced Tools > Log Stream on the Web App in the Azure Portal.

Web App secret management

You can also copy the following JSON directly into your Azure Web App configuration via the Advanced Edit feature.

If you are load balancing or require the scaling ("scale out") ability of Azure Web Apps then you need to consult the . This is due to the fact that a lot more needs to be configured to support scaling/auto-scaling.

Although Umbraco can be configured to use environmental storage it still requires its working-directory to be writable. If Umbraco is deployed to a read-only file system it will .

For example, Azure's is not supported by Umbraco. To check if your web app is using this feature you can check the WEBSITE_RUN_FROM_PACKAGE environment variable.

If you require the scaling ("scale out") ability of Azure Web Apps you need to consult the . This is due to the fact that a lot more needs to be configured to support scaling/auto-scaling.

Consult the if you would like to directly reference Azure Key Vault Secrets to your Azure Web App.

You can read more about them here
Load Balancing documentation
fail to boot
Run from Package feature
Load Balancing documentation
Azure Key Vault documentation