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VLAN is an acronym for Virtual Local Area Network. Several VLANs can co-exist on a single physical switch, which are configured via software (Linux commands and configuration files) and not through hardware interface (you still need to configure switch).
Hubs or switch connects all nodes in a LAN and node can communicate without a router. For example, all nodes in LAN A can communicate with each other without the need for a router. If a node from LAN A wants to communicate with LAN B node, you need to use a router. Therefore, each LAN (A, B, C and so on) are separated using a router.
You can use it wherever you need redundant links, fault tolerance or load balancing networks. It is the best way to have a high availability network segment. A very useful way to use bonding is to use it in connection with 802.1q VLAN support (your network equipment must have 802.1q protocol implemented).
Tomcat Cluster Session Replication how to is a document that describes how we can setup a tomcat 5.5 cluster with apache web server frontend using in-memory session replication.
Tomcat 5.5.x has significant performance improvements than tomcat 5.0, mostly because of java 5 (from performance metrics taken with jmeter – http://jakarta.apache.org/jmeter/ about 50% faster in compilation of classes/jsp/servlets). In our example we will use 1 apache instance that load balance requests along 4 instances of tomcat servers in 2 different servers.
In order to use smpatch you first need to register the system.
Linux Load Balancing Cluster HowTo is a document that describes how you can create a failover cluster of Linux machines that acts as a load balancing mechanism between the real network and groups of other machines (real servers).
This setup will help someone to achieve high availability in many services plus the ability and flexibility to add / remove servers when needed.