My partner has the following situation: he has a number of customers who use a library, or SDK, to connect to his Web services. However, here is one very specific case where it falls short! Where Cookie Insertion falls short Fantastic!įor most use cases, Cookie Insertion Just Works and is very easy to setup using ARR. $ curl -i -cookie ARRAffinity=6e04a77b7c6917600d9ff7ee980a4d4a8a0dfb135247289a9c58cf88587bec23 Īs long as we keep on sending the Cookie header, all our requests will now go to the same server in our farm. To illustrate, let’s look at some HTTP requests using curl: ARR will then keep on sending the requests in that “session” to the server whose name is in the Cookie. In subsequent requests, the browser will “honor” the Cookie and send it back to ARR. To be precise, ARR does not insert the server name in clear text, but rather a hash of the name, but the effect is the same. The idea is that ARR, standing in between a client browser and the server farm, will intercept incoming requests, choose a server to “stick” the session to, and will insert in the server response a custom HTTP Cookie that contains the name of the server. The technique ARR uses is usually known as a “Cookie Insertion” method. In order to better understand the requirements, let’s first look at how ARR implements session stickyness. However, I recently came across a partner who required more control over the sticky-session algorithm that what ARR provides. The excellent Richard Astbury from our partner Two10Degrees has an AzureARR project hosted on Github that packages ARR in a Web Role for use in Cloud Services.
AFFINITY PLUS ROUTING NUMBER WINDOWS
Using the Application Request Routing Module : this is the standard installation documentation from the IIS team, that you could for example follow to deploy ARR on Windows Virtual Machines.There are several resources describing this solution, here are a few interesting links: We typically recommend using our IIS Application Request Routing (ARR) module to implement sticky session if they are required for the application. This is not a problem for most Web sites, however it can prove challenging when migrating more complex projects to the Cloud, where the architecture may rely on sticky sessions provided by an on-premises load balancing solution. One well-known characteristic of the Windows Azure load balancer is that it only provides a round-robin algorithm, and does not support so-called “sticky” sessions.
AFFINITY PLUS ROUTING NUMBER HOW TO
You can find some detailed information on how to set this up in the Windows Azure documentation, like this article: Load Balancing Virtual Machines. Advanced Cookie-based session affinity with Application Request Routing Īs you probably know, the Windows Azure Platform has a built-in load-balancing service that you can typically use to create “farms” of Web servers for high availability and performance scale-out.