Load balancing servers, firewalls, and caches by Chandra Kopparapu

By Chandra Kopparapu

From an insider--a shut examine high-performance, end-to-end switching solutions
Load balancers are quickly turning into an fundamental answer for dealing with the massive site visitors calls for of the net. Their skill to resolve a large number of community and server bottlenecks within the net age levels from dramatic advancements in server farm scalability to removal the firewall as a community bottleneck. This publication presents a close, updated, technical dialogue of this fast-growing, multibillion buck marketplace, protecting the complete spectrum of topics--from server and firewall load balancing to obvious cache switching to worldwide server load balancing. within the procedure, the writer offers perception into the way in which new applied sciences are deployed in community infrastructure and the way they paintings. Written through an professional who hails from a number one net swap seller, this e-book might help community and server directors enhance the scalability, availability, manageability, and safeguard in their servers, firewalls, caches, and sites.

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Example text

Often, the clients are behind a firewall that blocks any incoming connections from the outside world. But the firewall allows outbound connections from the clients to the outside world so that the clients can access the Internet. In this scenario, active FTP will not work, because the server’s initiation of data connection to the client will be blocked by the firewall. Passive FTP helps work around this problem by having the client initiate the data connection to the server. 7: How passive FTP works.

The next connection (#No. 6) is from C1 to VIP1 on port 21. Port 21 is not grouped with port 80 or 443, because the FTP application on port 21 does not need to share any data with HTTP or SSL applications. Therefore, the load balancer selects RS2 based on server load. The next connection (#No. 6) is from C1 to VIP2 on port 80. Although it’s the same client source IP, since the VIP is different, the load balancer assigns this to RS3 based on server load. 6 is from C2 to VIP2 on port 443. Because this is the first connection from C2 to VIP2, it is load balanced to RS2.

For this case, there is another method called port grouping that’s better suited, as discussed next. 6: Session persistence based on port grouping. Port Grouping When we use one VIP for several applications and not all of them are related to each other, we can use this method to group only the related applications together. We need to configure the load balancer with a list of application ports that must be treated as one group. 5. 6 shows how the load balancer functions for various connection requests with port−grouping– based session persistence.

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