Describe the benefit of using deployment slot.

Deployment slots in Azure App Service make it easier and safer to update your app. Here’s how they help:

1. Smooth Updates: You can test your app in a separate "staging" area that’s just like your live app. This way, you can make sure everything works before you switch it over.

2. No Downtime: When you’re ready to make changes live, you can swap the staging area with your live app without any interruptions. Users won’t notice any downtime during the switch.

3. Quick Fixes: If something goes wrong with the new update, you can quickly go back to the old version. It’s like having a backup plan ready to go.

4. Separate Environments: Each slot can have its own settings and configurations, so you can keep your testing and live environments separate. This helps prevent mix-ups.

5. Testing with Users: You can let a few users try out the new features before they’re available to everyone. This helps ensure everything works as expected.

6. Gradual Rollouts: You can slowly roll out new features to a small portion of users first and then gradually increase the rollout. This lets you monitor how the new features perform.

7. Performance Checks: You can test how changes will affect your app’s performance in a staging slot that mimics your live environment. This helps you avoid performance issues when the update goes live.

By defaults all clients request to the apps production URL (http://azurewebsites.net) are routed to the production slot. One can automatically route a portion of traffic to another slot. what is the default routing rule applied to new deployments slots.

When you create a new deployment slot in Azure App Service, the default routing rule is that all incoming traffic is directed to the production slot. However, Azure allows you to configure traffic routing rules to manage how traffic is distributed across different slots.

Default Traffic Routing Behavior:

• New Slot: By default, a new deployment slot does not receive any incoming traffic until you explicitly configure it to do so. Initially, all traffic continues to go to the production slot.
  Configuring Traffic Routing:

• Traffic Routing: You can set up traffic routing rules to direct a portion of the incoming traffic to your new slot. This is useful for testing or gradually rolling out new features. Azure provides built-in options to split traffic between slots, such as:

• Percentage-Based Routing: You can specify a percentage of traffic that should be routed to the new slot. For example, you might choose to route 10% of the traffic to the staging slot while keeping 90% on production.

• Slot Swap: You can use the slot swap feature to swap the staging slot with the production slot, effectively making the staging slot the new production slot, while the previous production slot becomes the staging slot.

To set up traffic routing, you would typically go to the Azure Portal, navigate to your App Service, and configure the "Traffic Routing" settings under the "Deployment slots" section.