Note that this is true of all load balancing services: A persistence profile allows a returning client to connect directly to the server to which it last connected. Therefore, the more sessions in use on an application server instance, the poorer the performance. Marco Altieri Marco Altieri 1 1 silver badge 3 3 bronze badges. After the specified duration elapses and the cookie expires, the session is not sticky anymore. It all makes sense now! Fastest response time is likely a better indicator of capacity as we know that responses times increase along with resource consumption, thus a faster responding instance is likely but not guaranteed to have more capacity available. DIVIDE and CONQUER In cloud computing environments, where it is less likely to find available algorithms other than industry standard none of which are application-awareit may be necessary to approach the problem with a divide and conquer strategy, i. Cookie persistence can be used with both techniques, provided the application is web based and uses HTTP headers for each request Web Sockets breaks this technique. It can also include the destination port, to give the load balancer a bit more capacity in terms of simultaneously applications supported.
That "hack" is where sessions and cookies come into play. Some load balancing products and services describe this technique as “sticky sessions”, which is Rather than rely on the SSL/TLS session ID, the load balancer. Currently I have deployed 3 IIS node on my F5 LTM Load balancer. Can anyone let me know how to configure sticky session for all my three.
The choice of load balancing algorithms can directly impact – for good or ill – the Load Balancing Fu: Beware the Algorithm and Sticky Sessions.
f5 big ip Load balancer F5 and sticky session Server Fault
Updated 5 years agoOriginally posted June 06, by Lori MacVittie 38 F5 Lori MacVittie 38. or Type · It's 2am: Do You Know What Algorithm Your Load Balancer is Using?.
This makes sticky sessions more efficient, ensuring that users are never routed to a server after their local session cookie has already expired.
The problem is that I do not know the model of the F5. Simple Persistence Simple persistence is generally based on network characteristics, like source IP address.
We were trying to troubleshoot an issue with the session timeout, and I saw in the admin interface of the LB a parameter that specifies the "Persistence Timeout" for the stickiness of the session. While not necessarily unique to every session, this technique results in a more even distribution of load across servers. Sign up or log in Sign up using Google. The choice of load balancing algorithms can directly impact — for good or ill — the performance, behavior and capacity of applications.
Then, according to the .
The more advanced forms of persistence are specific to a protocol or rely on a capability that is not necessarily standardized across load balancing services.
They all look pretty much the same from the outside - ensure that a user, once connected, continues to be connected to the same application instance to ensure access to whatever state is stored in that instance.
Back to Basics The Many Faces of Load Balancing Persistence DevCentral
Sticky sessions management with Imperva load balancing Session stickiness provides an efficient, accurate way to maintain session information between a visitor and server in a load balancing setup, and can help reduce network workload.
What do you want to know next? Again, this algorithm in conjunction with persistence is not a panacea.
Sticky Sessions with f5 should be the solution; f5 "Sticky Sessions" sticks with persistence session, load balancer decides that every recurring.
Your application generates a cookie that determines the duration of session stickiness. Application-controlled session persistence Your application generates a cookie that determines the duration of session stickiness.
Note that this is true of all load balancing services:. With sticky sessions, a load balancer assigns an identifying attribute to a user, typically by issuing a cookie or by tracking their IP details. After the specified duration elapses and the cookie expires, the session is not sticky anymore. It's a critical capability of load balancing without which stateful applications which is most of them including VDI, most web applications, and data analysis tools would simply fail to scale.
Load Balancing Fu Beware the Algorithm and Sticky Sessions DevCentral
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