Since App Service is multi-tenant infrastructure, is it true that my app service might share same underlying VM and outgoing IP with other app service which not owned by me?
Yes. Your app service will share the same outgoing IP. App services in the same plan will share a load balancer, and will use one of four IP's for outgoing traffic.
The IP's are shown in the Azure portal in the app service's properties, and can also be retrieved using powershell.
Details about the network traffic for app services: https://learn.microsoft.com/en-us/azure/app-service-web/app-service-app-service-environment-network-architecture-overview
Related
I deploy my web application to an App Service instance on Premium tier. My web application makes outbound requests to external resources on the Internet.
In order to secure the connection with one of these external resources so I can reach it with a private IP address, my plan is to create a Site-to-Site VPN from Azure to Oracle Cloud Infrastructure (where the external resource resides). Then, I plan to use the VNET Integration for outbound traffic and connect my App Service to my VPN.
My question is - will the web application still be able to reach the other external resources on the Internet with their public IPs? I believe the answer is related to routing tables but I can't wrap my mind around it.
Just because you integrate a Regional VNet (I'm assuming) doesn't mean the app service won't be able to make outbound connections. Pretty much like
When you integrate your app service with your VNet that has the site-to-site VPN, traffic from your app service will traverse the Azure network rather than going out to internet, assuming your app service is using an RFC1918 address for your infrastructure. If you want to secure the traffic even further, then your app service would need to be hosted inside an App Service Environment
I have azure app service which runs .net core web api. This api access several external API s to get data and those external services has to whitelist the outbound ip addresses of my app service.
Azure app service has several outbound ip addresses and it can be change when upgrade/downgrade app service or when make internal changes like changing app service plan or resource group.
Is there any solution in azure to setup this app service behind a forward proxy ?, so i can share the IP of the forward proxy to external parties.
I think the best way would be to add all App services under a virtual network and create a Virtual Network Gateway to all outbound connections.
This would potentially need below azure services to be created:
- Virtual network
- Subnet
- Virtual Network gateway
- Routing tables (to route traffic via Gateway)
A better way would be sharing a domain name rather than IP address. Here's how to configure it directly in the Azure Portal:
https://learn.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain
You can also add an API Management in front of your web app and use it as API gateway and also apply policies on it.
https://learn.microsoft.com/en-us/azure/api-management/configure-custom-domain
I have an app service in Azure (not in ASE App Service Env). It is integrated with a vnet.
And I have an API on-premises that this app must access by its internal on-prem DNS name.
And there is an Express Route between Azure and on-prem location.
How to access the on-prem API by its DNS name through an Express Route?
How to configure network connectivity?
How to resolve on-premises names in Azure?
There are different ways of achieving that, depending on your set-up.
You might need to use:
App Service
For App Services you must use Regional VNet integration.
If you need all traffic from the App Service to be routed via the Vnet, you must specify in the app service the setting WEBSITE_VNET_ROUTE_ALL = 1
https://learn.microsoft.com/en-us/azure/app-service/web-sites-integrate-with-vnet#regional-vnet-integration
DNS
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-name-resolution-for-vms-and-role-instances
Troubleshoot DNS in App Service
https://learn.microsoft.com/en-us/azure/app-service/web-sites-integrate-with-vnet#troubleshooting
Configure Peering
https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-routing-portal-resource-manager
Route tables for VNets (not always necesary)
https://learn.microsoft.com/en-us/azure/virtual-network/manage-route-table
I have an azure website that I can access by
myname.azurewebsites.net
In Azure dashboard, the IP is 104.214.237.135
When I try to access my website by IP I have a 404 error
I don't understand. My plan App Service is S1
Regards
Azure App Service is a multi-tenant service, except for App Service Environments. Apps that are not in an App Service environment (not in the Isolated tier) share network infrastructure with other apps. As a result, the inbound and outbound IP addresses of an app can be different, and can even change in certain situations.
App Service Environments use dedicated network infrastructures, so apps running in an App Service environment get static, dedicated IP addresses both for inbound and outbound connections.
Azure AppService IP addresses are shared between tenants and not guaranteed to be static. Your app is bound to the hostname, not the IP address. Unless you are using App Service Environment, you cannot use a static / dedicated IP address with Azure AppServices. You can add additional custom hostnames to your app.
I have created an Azure App Service Environment with 4 IP Addresses but all of them are unassigned. I have a bunch of app services and I need to have one IP per app service.
I figured it out. You need to upload a SSL certificate (you can buy it in Azure portal or from any other company), import it and bind it. When you bind it you say it's an IP Based SSL. After you save you get a dedicated IP for that app service.
More on https://learn.microsoft.com/en-us/azure/app-service-web/web-sites-purchase-ssl-web-site