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
Related
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 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.
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/
Currently I have a Service Fabric cluster with 2 stateless services hosting Asp Web APIs. While creating the cluster also appropriate Azure Load Balancers got created.
Now I would like to add Application Gateway in front of my cluster for various reasons like SSL offloading, url-routing etc.
I'd like to understand how to configure the Application Gateway correctly. I see 2 options, not sure which one is valid:
Application Gateway replaces the existing Load Balancer and points directly to SF services hosting WebApi
I keep existing LB configuration and Application Gateway points to this LB (seems like 1 LB solution too many)
Which one is correct? Any advise how to configure?
Approach 2 is what we are using, We have kept the load balancer and that is routing any request received from the Application Gateway. We found this to be easiest and simplest choice, as this involves minimum changes to be done in Application Gateway.
Your two web api's can run on every node in the VM scale set. The Azure Load Balancer is used to distribute traffic over those nodes. Targeting a single service on a single node will reduce scalability and fault tolerance.
You could use the App Gateway to translate incoming request to different ports on the Load Balancer. (E.g. direct traffic to API 1 #url ~/1/ and API 2 #url ~/2/)
Favor using load balancing rules (using all nodes) over NAT redirections (to single nodes). This way you'll have a performant, reliable system.
Solution 2 would also provide possibly to create VPN connection e.g to manage your cluster. Then no need to expose management endpoint to the public. Internal lb also brings on additional features to utilize in the future.
I would go with your first option and to implement it create / modify your ARM template so that it doesn't contain the load balancer and instead contains the application gateway.
Here is a link to the quick starts for ARM templates which you can use. There isn't an out of the box example for service fabric with a gateway but it will give you a great starting place.
link
Can I use azure to deploy an algorithm for load balancing that I read in one of the research papers? If yes how should i approach the problem and if no then please suggest some alternatives.
Thank you.
Azure provides in-built public and private load balancing and DNS-based routing capabilities (Traffic Manager).
If you want to run your own load balancing infrastructure you can do that but you'd have to run it on Azure Virtual Machines and utilise Virtual Networking to allow you to connect multiple load balanced instances to your load balancer.
For custom load balancing beyond what is available in Traffic Manager, then you'll need to deploy an F5 app and route traffic trough that app to your website.