Session affinity, sometimes referred to as sticky sessions, is a platform feature that associates all HTTP requests coming from an end-user with a single application instance (web dyno).

Besides, what is client session affinity?

Most servers use the term "Session Affinity" to indicate that within a cluster of servers, requests from the same client alway get routed back to the same server. Implementations vary, but is usually base on some kind of routing scheme that identifies the client by IP address or a browser cookie.

Beside above, what is cookie based session affinity? The cookie-based session affinity feature is useful when you want to keep a user session on the same server. By using gateway-managed cookies, the Application Gateway can direct subsequent traffic from a user session to the same server for processing.

Then, what is server affinity?

Server affinity refers to the ability of a load balancer or router to send a user's request to the same server where their session was initiated. If session-failover is supported by the application or networking layout, server affinity is not required, as it doesn't matter which server serves the request.

What is affinity in load balancing?

And in the technical world, an affinity means that the load balancer will always use the same server for a particular user or a particular application instance. An example of this would be a user that is communicating with this application through the load balancer.

What is Load Balancer stickiness?

Session stickiness, a.k.a., session persistence, is a process in which a load balancer creates an affinity between a client and a specific network server for the duration of a session, (i.e., the time a specific IP spends on a website).

Why do we need sticky session?

A sticky one keeps a user's session on the server where it started. A non-sticky balancer can put each request in a session on a different server. The advantage of sticky sessions is that it isn't necessary to move session-related data from one server to another. This can produce more efficient performance.

What is persistent session?

Session persistence refers to directing a client's requests to the same backend web or application server for the duration of a “session” or the time it takes to complete a task or transaction. High-traffic websites must support hundreds of thousands, if not millions, of users in a fast, reliable manner.

Can load balancers perform encryption?

An SSL load balancer is a load balancer that also performs encryption and decryption of data transported via HTTPS, which uses the Secure Sockets Layer (SSL) protocol (or its successor, the Transport Layer Security [TLS] protocol) to secure HTTP data as it crosses the network.

What is session persistence in f5?

One common requirement of load balanced applications, since most application servers maintain session information on the local box, is that a client must stay locked to a single server for the duration of the session. The ability of a load balancer to keep a client locked to the same server is known as persistence.

How does a load balancer work?

Load balancing is defined as the methodical and efficient distribution of network or application traffic across multiple servers in a server farm. Each load balancer sits between client devices and backend servers, receiving and then distributing incoming requests to any available server capable of fulfilling them.

What is meant by sticky session?

Sticky session refers to the feature of many commercial load balancing solutions for web-farms to route the requests for a particular session to the same physical machine that serviced the first request for that session.

What is sticky session in Tomcat?

Overview. Sticky Session is a method used with Load Balancing, to achieve server affinity. In other words, it assigns a particular client with a particular server instance behind Load Balancer, so that HTTP session doesn't get lost across application instances.

What is client affinity?

Client affinity is defined between a client connection and a data source. When client affinity is defined, requests from a specified client connection are distributed to a specified data source in a data source pool. Client affinity can be configured in the following ways: Enabled or disabled.

What is session affinity in a load balancer?

Session affinity. Session affinity overrides the load-balancing algorithm by directing all requests in a session to a specific application server. With session affinity, the application server that handles the first client request generates session information and places it in a Set-Cookie header in the response.

What is session failover?

Session Failover. A concept used in a High Availability Cluster where sessions are not lost when a single application server goes offline, or is otherwise unreachable. This is the method used by Tomcat to allow web applications to be distributable.

What is the difference between round robin and sticky sessions?

What is the Difference Between Load Balancer Sticky Session vs. Round Robin Load Balancing? A load balancer that keeps sticky sessions will create a unique session object for each client. Sticky sessions can be more efficient because unique session-related data does not need to be migrated from server to server.

What is session stickiness in WebLogic?

You use session persistence to permanently store data from an HTTP session object to enable failover and load balancing across a cluster of WebLogic Servers. When your applications stores data in an HTTP session object, the data must be serializable.

What is session replication?

Session replication is a mechanism used to replicate the data stored in a session across different instances. However, the replicated instance must be part of the same cluster. When session replication is enabled in a cluster environment, the entire session data is copied on a replicated instance.

What is SSL persistence?

SSL persistence is a type of persistence that tracks SSL sessions using the SSL session ID, and it is a property of each individual pool. Even when the client's IP address changes, BIG-IP system still recognizes the session as being persistent based on the session ID.

Which load balancers support ec2 Classic?

CLB vs ALB Feature ComparisonClassic Load Balancer Feature CLB supports custom application cookies Sticky Sessions Yes, including EC2-Classic VPC Support No, CLB only supports fixed mappings between listener and target hosts Dynamic Port Mapping HTTP, HTTPS, TCP, SSL Supported Protocols

What is session in software?

A session is the total period of time devoted to an activity. In computer systems, a user session begins when a user logs in to or accesses a particular computer, network, or software service. It ends when the user logs out of the service, or shuts down the computer.

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