2011-11-23 14:27:22 
阿炯
Zen 是一个基于 Debian 的发行版，主要用于实现 TCP 的负载均衡。可通过定制的脚本来检查后端的运行状态，通过创建 Zen 集群来实现高可用性。通过 rrd 监控服务器状态，使用基于 HTTPS 的界面进行轻松的性能管理、配置和路由表配置等等。
In computer networking, load balancing is a technique to distribute workload evenly across two or more computers, network links, CPUs, hard drives, or other resources, in order to get optimal resource utilization, maximize throughput, minimize response time, and avoid overload. Using multiple components with load balancing, instead of a single component, may increase reliability through redundancy. The load balancing service is usually provided by a dedicated program or hardware device .
Zen is a entire solution embedded on a distro with Debian core, used for create an appliance for TCP load balancing, with advanced algorithms for techniques load balancing as round robin, weight, priority. Also, checking for backend, active/passive zen cluster, rrd, configuring a lot of farms, advanced networking configuration and vlanes, configuration and managment with a HTTPS GUI, advancing configuration of table routes, and more (read the changelog).
Zen isn't a gateway or a firewall, Zen is a TCP load Balancer, with advanced functions that create a good open source solution for systems with a high availability
Zen Load balancer manage concepts about Load Balancers Servers and add own concepts that give more facitity to work with it. At the moment this product is a TCP Simple Load Balancer that can work with services as SMTP, LDAP, FTP, IMAP, POP, HTTP, or other service over TCP protocol.
Features
* Load Balancing on Layer7
* Layer7 over 30000 concurrent connections
* Load Balancing with sNAT method
* Load balancing TCP services
* Load balancing UDP services
* Advanced support for http and https
* http and https persistence sessions: basic, client ip, cookie, url, header
* SSL wrapper
* Use algorithms like: round robin, weight, priority or hash
* webDAV, MS extensions webDAV and MS RPC extensions verbs for http and https
* TCP and UDP persistence sessions: client ip
* VLAN Tagging (802.1Q)
* Advanced configuration for networking on physical, virtual or vlan interfaces
* Independent route tables for work with independent NICs
* Checking and advanced checking of backend servers
* High availability with cluster Active/Passive
* Backup configuration
* Advanced global status with graphs
* Easy administration over https and ssh
* Virtual Service Configurations can be edited and tuned on-the-fly
* Use NTP sync
* Easy and open updates over our repositories on internet
* Configure virtual servers and farms as your hardware allows
最新版本：3.0
farmguardian增加检查系统和优化后台状态切换，支持四层高级检查，提升了安全性，修复一些漏洞和 IE9 的兼容性问题。
官方主页：http://www.zenloadbalancer.com/