The web application and deployment slots are created within the same environment (This is also the case when you create a Azure Web App within the same App Service Plan). This means resources between the two instances are shared, So if you want to do a stress test on pre-production you are certain that it will effect the performance of the. It is possible to have a single production database shared by staging and production Azure App Service slots, and still having zero-downtime deployments. To do this, you need to ensure that all your migrations are backwards compatible, such that the current and new versions of the web app can run simultaneously with the same database. App Service Static Web Apps is a great alternative to Azure Storage static website hosting and is also appropriate in cases where you don't require a web server to render content. App Service Static Web Apps provide you with a fully managed continuous integration and continuous delivery (CI/CD) workflow from GitHub source to global deployment. Azure Deployment Slot is Awesome functionality for regular (Full) production deployment build process using Deployment Slot Swap functionality. Publishing web app to Azure Websites Staging deployment slot fails with webjob. Azure Webjobs vs Azure Functions: How to choose.
This post explains some of the not so well-known features and configurations settings of the Azure App Service deployment slots. These can be used to modify the swap logic as well as to improve the application availability during and after the swap. Here is what you can do with them:
Swap based on the status code
During the swap operation the site in the staging slot is warmed up by making an HTTP request to its root directory. More detailed explanation of that process is available at How to warm up Azure Web App during deployment slots swap. By default the swap will proceed as long as the site responds with any status code. However, if you prefer the swap to not proceed if the application fails to warm up then you can configure it by using these app settings:
WEBSITE_SWAP_WARMUP_PING_PATH
: The path to make the warm up request to. Set this to a URL path that begins with a slash as the value. For example, “/warmup.php”. The default value is /.WEBSITE_SWAP_WARMUP_PING_STATUSES
:Expected HTTP response codes for the warm-up operation. Set this to a comma-separated list of HTTP status codes. For example: “200,202” . If the returned status code is not in the list, the swap operation will not complete. By default, all response codes are valid.
You can mark those two app setting as “Slot Settings” which would make them remain with the slot during the swap. Or you can have them as “non-sticky” settings meaning that they would move with the site as it gets swapped between slots.
Minimize random cold starts
In some cases after the swap the web app in the production slot may restart later without any action taken by the app owner. This usually happens when the underlying storage infrastructure of Azure App Service undergoes some changes. When that happens the application will restart on all VMs at the same time which may result in a cold start and a high latency of the HTTP requests. While you cannot control the underlying storage events you can minimize the effect they have on your app in the production slot. Set this app setting on every slot of the app:
WEBSITE_ADD_SITENAME_BINDINGS_IN_APPHOST_CONFIG
: setting this to “1” will prevent web app’s worker process and app domain from recycling when the App Service’s storage infrastructure gets reconfigured.
The only side effect this setting has is that it may cause problems when used with some Windows Communication Foundation (WCF) application. If you app does not use WCF then there is no downside of using this setting.
Control SLOT-sticky configuration
Originally when deployment slots functionality was released it did not properly handle some of the common site configuration settings during swap. For example if you configured IP restrictions on the production slot but did not configure that on the staging slot and then performed the swap you would have had the production slot without any IP restrictions configuration, while the staging slot had the IP restrictions enabled. That did not make much sense so the product team has fixed that. Now the following settings always remain with the slot:
- IP Restrictions
- Always On
- Protocol settings (Https Only, TLS version, client certificates)
- Diagnostic Log settings
- CORS
If however for any reason you need to revert to the old behavior of swapping these settings then you can add the app setting
WEBSITE_OVERRIDE_PRESERVE_DEFAULT_STICKY_SLOT_SETTINGS
to every slot of the app and set its value to “0” or “false”.swap Diagnostics detector
If a swap operation did not complete successfully for any reason you can use the diagnostics detector to see what has happened during the swap operation and what caused it to fail. To get to it use the “Diagnose and solve problems” link in the portal:
From there click on “Check Swap Operations” which will open a page showing all the swaps performed on the webapp and their results. It will include possible root causes for the failures and recommendations on how to fix them.
GitHub Action
Azure Static Website Deploy
Azure Deployment Slot Settings
Deploys code to Azure Storage and enables Static Website
Installation
Copy and paste the following snippet into your .yml file.
Learn more about this action in feeloor/azure-static-website-deployChoose a version
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This action is designed to use the Azure CLI to enable static website and upload a directory of your choice to your Azure Storage account.
Usage
Example
Place in a
.yml
file such as this one in your .github/workflows
folder. Refer to the documentation on workflow YAML syntax here.Required Variables
Azure Static Website Deployment Slots Free
Key | Value | Type | Required |
---|---|---|---|
SOURCE_DIR | The name of the directory you want to upload | env | Yes |
AZURE_CLIENT_ID | Your Azure Client ID. | secret | Yes |
AZURE_SECRET | Your Azure Secret. | secret | Yes |
AZURE_TENANT_ID | Your Azure Tenant ID. | secret | Yes |
AZURE_SUBSCRIPTION_ID | Your Azure Subscription ID. | secret | Yes |
AZURE_STORAGE_ACCOUNT_NAME | Your Azure Storage Account Name. | secret | Yes |
AZURE_INDEX_DOCUMENT_NAME | The index document that you specify when you enable static website hosting, appears when users open the site and don't specify a specific file. More Information Here | env | Yes |
AZURE_ERROR_DOCUMENT_NAME | If the server returns a 404 error, and you have not specified an error document when you enabled the website, then a default 404 page is returned to the user. More Information Here | secret | No |
License
This project is distributed under the MIT license.
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