I have web API service which I planned to host in Azure environment probably in VM.
My application is using sticky session and I have to enable the Load Balancer in Azure.
Can you please suggest best approach to load balance the application Or Can I use Azure Loadbalancer with sticky session other than Application gateway.
Regards
Abdul
You can set the sticky session in load balancer rules with setting the session persistence as the client IP. And the steps like this.
There is some difference between the Application Gateway and Load Balancer.
So if you will do some changes in VM, the Load Balancer is better. If not, the application Gateway is better and can be safer for web access.
Related
I have a standard load balancer existing in our environment and looking for ways to migrate to the Azure Application gateway. What would be the best way to minimize downtime and have a smooth transition?
The only I can see is deploying the application gateway and configure it and then delete the Azure Load balancer
The easiest solution would be to put Application Gateway in front of the Load Balancer and simply use load balancer as a backend. that would be the least disruptive scenario.
After this setup is working you can configure additional backend bypassing the load balancer and remove your load balancer
I use Azure Application Gateway. When I review the documents, I only see round-robin distribution of incoming traffic, cookie-based session affinity, URL path-based routing for Application Load Balancer. Is there any way to use Least Connection for that. This is available on AWS, but I couldn't see it on Azure.
Yes, you can do it via https://resources.azure.com/
You should open that resource; find your RG and APP GW and you will see setting
routingmethod -> roundrobin and you can change it to leastresponsetime
https://learn.microsoft.com/en-us/azure/application-gateway/how-application-gateway-works#how-an-application-gateway-routes-a-request
Round-robin (or cookie based affinity) is all you can do. Kinda lame.
I have an Azure WebRole, which publishes a WCF Service with PerSession setting. This means, session needs to be preserved for a long time... This is because of synch-framework and cannot be changed.
Now I have the problem when I want to use Multi-Instances on that Web Role (Classic Azure Cloud Service)
Can I configure an Application Gateway with endpoints not to the Public WebRole but to each Instances, so that the Gateway handles the Balancing?
How?
Thanks
Technically, the Application Gateway support for multi-tenant backends, you could configure an IP address or FQDN of your instances in the backends. Here is a quickstart: Direct web traffic with Azure Application Gateway - Azure portal
However, the Application Gateway is known as application layer (OSI layer 7) load balancing which enables you to manage traffic to your web applications. Perhaps the traditional layer 4 load balancer is better for balancing WCF Service. Moreover, In Cloud Services, you get a load balancer automatically configured when you create the service. You could get more explanation in this question.
Ref: Get started creating an internal load balancer (classic) for cloud services
I am creating a network with 2 app services, containing 2 slots each
I know the load balancers are designed to work with VM's, but I am wondering if it is possible to place a load balencer on these 2 app services to balance the load between them, Is it possible to do so??
When you Scale your Web App you add instances of your current pricing tier and Azure deploys your Web App package to each of them.
There's a Load Balancer over all your instances, so, traffic is automatically load balanced between them. You shouldn't need a Virtual Machine for this and you don't need to configure any extra Traffic Manager.
You may want to refer: scale your app in Azure App Service for more details.
but I am wondering if it is possible to place a load balencer on
these 2 app services to balance the load between them, Is it possible
to do so??
According to your description, maybe you are looking for Azure application gateway(layer 7).
Azure application gateway works at the application layer (Layer 7 in the OSI network reference stack). It acts as a reverse-proxy service, terminating the client connection and forwarding requests to back-end endpoints.
Azure application gateway support HTTP, HTTPS and Websockets.
Here is the features offered by each service:
More information about Application gateway, please refer to this article.
Maybe little late but I guess this what you are looking at
Scale Out- A scale out operation is the equivalent of creating multiple copies of your web site and adding a load balancer to distribute the demand between them. When you scale out a web site in Windows Azure Web Sites there is no need to configure load balancing separately since this is already provided by the platform.
https://azure.microsoft.com/en-us/blog/scaling-up-and-scaling-out-in-windows-azure-web-sites/
What are some legitimate use-cases for fronting an Azure "Web App" service with a reverse proxy (i.e. ARR)?
I'm specifically interested in security considerations. For the purposes of this question, let's assume load balancing is handled by the Azure load balancer and the proxy would not perform any additional features such as caching or compression.
The Azure Load Balancer is a Layer-4 component. ARR is a Layer-7 router, therefore it can do sticky sessions (instance affinity) and health checking.
In App Service it also does TLS offloading, which is pretty nice since your application code only has to deal with plain HTTP. More on that here: https://stackoverflow.com/a/38726543/4148708
If you don't need/want any of that, then by all means, go to Cloud Services, VM Scale Sets or vanilla VMs.