-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Raquib,
On 1/28/14, 12:29 PM, Raquib Hasan wrote: > I am not sure whether the sticky session is needed or not. The > session replication also may not be needed. My requirement is very > simple. If you don't need anything fancy, may I suggest that you start by using sticky sessions and no session-replication? If you use sessions, you'll need to use one of the two otherwise nothing will work properly. Sticky-sessions are simple to configure and get you a lot of mileage without much horsepower at all. > There are 2 back end servers. I want both gets same user > communication at the same time, so that, if one server fails the > other can continue. Assuming that you can suffer the loss of a single in-progress request, you want to route the request to a /single/ back-end server and not do something weird like broadcasting. If you use sticky sessions, the same back-end server will get all of the requests for a particular session. If that node fails, subsequent requests will be routed to the other server. If you don't have session-replication enabled, the user's session will be lost and they will have to re-login, possibly re-starting any work in-progress. That's up to your webapp's tolerance for fail-over to handle. > I though cluster is the solution. Does the session replication > come with the clustering feature? Clustering ≈ session replication. Tomcat's clustering does not provide anything other than session replication. > VIP means Virtual IP address given to client. Back-end servers can > be communicated using the VIP no matter where the LB routes the > requests to. I don't think that's necessary at all. LBs are designed to handle sets of back-end servers and choose one of them based on a number of criteria. You don't need to create a virtual IP that wanders-around through your beck-end servers: the Big IP itself is the IP address everyone will hit. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJS5+rxAAoJEBzwKT+lPKRYMqIP/3ekCp19upctE7XhZCu5/eca 5DZkTqzVtBoX2twnnRAwd9CN8X2aTAo26Lg9H+KtVeykGyKx4tseycWzq/4mR1Dq g4v8uw6SK/L7yReC84gUW55bvMxr93t4Zdy8dy6qp0L5yoEVlFEEbSaIcOyYHuIA NbFef4Cv5v8JjOOqNSRiwuweXs2IVRRzDee26YrB5ASwP1wPIG6emlCCdlMLqjvo eKmM1Gcm6AVoiJT+iG47Tms2MXrNhk58HD6xjh4+APdzs70/419UGVEj+YeKcMBv 0/vu27wnZd90AECKgSwv8f0aAgkX4pveEyBf1UvvoEywZ1nEj6LLv/+1xELX/1no pS0/cBGcDE8ujPUpa/SsLFyVkvJPcLYTdQ5V0yMUHb7qQysduYLF5mSI30OGs+aW DJm0bzLU6XZhVofmDBnG6vpYQKH3BxMjLlsUzQdM2W2EP/NwmNZuILfWJ6P/Wc3d r6Fck7GbAD5Ycn666FpclMIZC6H7GhlsRs9TGwRh0s3RBpQm9nLIIUiUDlRNJz3c hOMU6FRP1COx2dNjSPATtKnT2IPKofDpWSVTrlK9PrmFG7WztMboF0dfZZFamyZD wTzppXEXgW+scDYbnp+Nn7O55YReQfBW4Gk3qvWIgIEG6vs7wl8LRsr1a2FODCJb VmOeh6a6RNIemYG4nxCJ =X+/W -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
