F5 feature description and configuration diagram of the load balancer

Based on the huge network structure, the use of Cluster Server brings a lot of load problems such as traffic. So the relative, load-balanced technology also emerged. Each technology requires product support, so let's now look at one of the F5 load balancers. So first of all, we first introduce the structure of the product function.

Many vendors have launched a load balancer dedicated to balancing server load, such as NetScaler of F5 Network's Big-ip,citrix company? The official name of the F5 big-IP LTM, called the local traffic manager, can do 4-7-tier load balancing with load Balancing? Application Exchange? Session Exchange? Status monitoring? Smart network address translation? General persistence? Response error handling? IPV6 gateway? Advanced routing? Smart port mirroring? SSL acceleration? Smart HTTP Compression? TCP optimization? 7th Level rate shaping? Content buffering? Content conversion? Connection acceleration? cache? Cookie encryption? Selective content encryption? Apply attack filtering? Denial of service (DoS) attacks and SYN flood protection? Firewall-packet filtering? Package disinfection and other functions?

The following are the main features of F5 big-IP as an HTTP load balancer:

①? F5 Big-IP provides 12 flexible algorithms to distribute all traffic evenly to each server, while facing the user, just a virtual server?

Ii? F5 big-IP can confirm that the application can return the corresponding data to the request? If the service stops on one of the servers behind F5 big-IP, the F5 checks out and identifies the server as down, so that the user's access request is not routed to the failed server? As long as the other servers are normal, the user's access will not be affected? Once the outage is fixed, F5 big-IP automatically verifies that the application has been able to respond correctly to the customer request and resume delivery to that server.

③? F5 big-IP session hold function with dynamic session?

④? F5 big-IP irules function can do HTTP content filtering, according to different domain names? URL to transfer access requests to different servers?

Below, in conjunction with an instance, configure the F5 big-IP LTM v9.x Load balancer:

①, assuming that the domain name blog.s135.com is resolved to an extranet/public virtual ip:61.1.1.3 (VS_SQUID) of the F5 load balancer, there is a server pool (POOL_SQUID) under the virtual IP that contains two real squid servers under the pool ( 192.168.1.11 and 192.168.1.12)?

②? If the squid cache misses, the F5 intranet virtual ip:192.168.1.3 (Vs_apache) is requested, and there is a default server pool (Pool_apache_default) under the virtual IP. The server pool contains two real Apache servers (192.168.1.21 and 192.168.1.22), and when the virtual IP matches the irules rule, another server pool (pool_apache_irules) is accessed. The server pool also contains two real Apache servers (192.168.1.23 and 192.168.1.24)?

③? Also, the default gateway for all real servers points to the F5 load Balancer's own intranet IP, or 192.168.1.2?

④? All real servers access the Internet via Snat IP address 61.1.1.4?

F5 feature description and configuration diagram for load balancer