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LocalDirector provides a real-time, embedded operating system designed for load balancing and support of high traffic The LocalDirector 430 model offers up to 240 Mbps actual load-balancing throughput, and 18,000 connections per second The LocalDirector 416 model supports up to 80 Mbps of actual load-balancing throughput, and 7,000 connections per second LocalDirector has 16 interfaces for connecting to servers directly Alternatively, an interface also can be connected to a switch, to support larger server farms and allow flexibility for a variety of network connections Figure 13-11 illustrates this flexibility
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Figure 13-11: Types of LocalDirector connections
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LocalDirector offers several types of connection management: Real or virtual servers provide mutual backup Maximum connection limits can be set for each server TCP traffic can be directed to different servers based on service, speed, source IP, or current quantity of connections Server resources can be added or relocated Servers can be gracefully shut down or automatically started Real and virtual IP addresses are allowed on different subnets A user can enter a registered IP address and try to access Web traffic through traditional port 80 LocalDirector can map that registered (real) IP address to one or more virtual IP addresses, and to the same port 80 or to multiple virtual ports Figure 13-12 illustrates the concept of virtual and real ports
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Figure 13-12: LocalDirector virtual and real ports License counts or applications are not overwhelmed by setting a maximum connection Packet coloring allows implementation of powerful quality-of-service networking
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Like DistributedDirector, LocalDirector allows the configuration of access control lists (ACLs) to control access by source IP address or service The bridging capability of LocalDirector can be activated on a per-port basis to assist you in controlling direct access to individual servers via their registered IP addresses LocalDirector also supports Network Address Translation (NAT), which allows servers with unregistered IP addresses to access the public Internet effectively preventing unauthorized external access to internal servers
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Applications Supported by LocalDirector
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LocalDirector supports server farms in both Internet and intranet environments
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Internet Services
LocalDirector can manage servers that present Web content, electronic commerce applications, email, host access via Telnet, and software distribution via FTP All traffic is handled dynamically by LocalDirector Typically, the LocalDirector 430 model would be used to support Internet services
Intranet Services
Employees, customers, and suppliers can access internal servers for information In addition to features for balancing the traffic load, LocalDirector provides firewall-type security features that protect these servers from unauthorized access via the Internet These servers are protected by filtering based on source client IP address and service Depending on traffic demands, the LocalDirector 416 model would be used to support intranet services
DistributedDirector and LocalDirector Configuration Examples
DistributedDirector can be used to distribute traffic among several topologically dispersed LocalDirectors Depending on the configured metric, DistributedDirector sends clients to the best LocalDirector (Metrics are described earlier in this chapter) Use of the DistributedDirector's server availability parameter guarantees the existence of at least one responsive server within the cluster behind a LocalDirector A failed server availability check would tell the DistributedDirector that any of the following conditions might exist: All servers in the cluster behind the LocalDirector are out of service The LocalDirector is out of service The LocalDirector is not reachable from the DistributedDirector
Based on the queries the DistributedDirector gathers from the DRP Server Agents, the DistributedDirector parcels out the traffic load to multiple LocalDirectors These LocalDirectors then provide local, intelligent load balancing to ensure that connections are allocated to the best servers at each distributed server site The examples in this section are real configurations for a DistributedDirector and a LocalDirector The comments within the configurations will assist you in understanding the functionality of certain commands Figure 13-13 is a visual representation of the configurations
Figure 13-13: Configuration examples using DistributedDirector and LocalDirector The DistributedDirector is typically located off the Internet router, in order to eliminate unnecessary traffic on the internal LAN The LocalDirector sits in front of the switch (or hub) where your server farm connects, or the servers may plug directly into the LocalDirector According to the configurations in the next two sections, a client requesting Web services from wwwveltecom will be sent initially to the DistributedDirector The DistributedDirector will determine whether the servers behind the LocalDirector can provide the best response, or whether the request should be sent to IP address 55227 DistributedDirector uses Portion metric values assigned to both the LocalDirector and the IP address 55227 If the traffic is directed to the LocalDirector, that system will select the best server based on the round-robin technique
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