What is a sticky session?

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).

What are the issues with sticky session?

Since requests for a user are always routed to the same machine that first served the request for that session, sticky sessions can cause uneven load distribution across servers.

What is session persistence in WebSphere?

Configuring WebSphere Application Server HTTP session persistence to a data grid. You can configure your WebSphere® Application Server application to persist sessions to a data grid. This data grid can be in an embedded container server that runs within WebSphere Application Server, or it can be in a remote data grid.

What is the difference between session affinity and sticky session?

Session affinity, also known as “sticky sessions”, is the function of the load balancer that directs subsequent requests from each unique session to the same Dgraph in the load balancer pool.

How do I set a sticky session?

Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/ .

  1. On the navigation pane, under LOAD BALANCING, choose Load Balancers.
  2. Select your load balancer.
  3. On the Description tab, choose Edit stickiness.
  4. On the Edit stickiness page, select Enable load balancer generated cookie stickiness.

How do you test sticky sessions?

To test the sticky sessions configuration changes, start the Tomcat instances and the Apache HTTP server and follow the test procedure in this section. Operation Console on the back-end machines. Verify that the behavior in a clustered environment is the same as in a single-server environment.

How do you stop a sticky session?

To avoid this kind of problem, there are several ways:

  1. Use a clustered web application server where the session are available for all the servers.
  2. Sharing user’s session information in a database or a file system on application servers.
  3. Use IP level information to maintain affinity between a user and a server.

Why is session persistence important?

Session persistence ensures that, at least for the duration of the session or amount of time, the client will reconnect with the same server. This is especially important when servers maintain session information locally.

What is the difference between round robin and sticky sessions?

The round-robin algorithm is used to route a user’s first request to a web server when sticky load balancers are used to load balance in a round-robin manner. Requests are then forwarded to the same server until the sticky session expires. At this point, a new sticky session is created via the round-robin method.

How do you test session stickiness?

How Do I Test Sticky Sessions Using cURL?

  1. nohup python –m SimpleHTTPServer 80 & Check whether the HTTP service is running normally:
  2. curl http://127.0.0.1:80. Log in to the other backend server and create a file named 2.
  3. nohup python –m SimpleHTTPServer 80 &
  4. curl http://127.0.0.1:80.

How do you set a sticky session?

Duration-based session stickiness

  1. On the navigation pane, under LOAD BALANCING, choose Load Balancers.
  2. Select your load balancer.
  3. On the Description tab, choose Edit stickiness.
  4. On the Edit stickiness page, select Enable load balancer generated cookie stickiness.