Anycast as a Load Balancing Feature Presentation for ... - Usenix
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Anycast as a Load Balancing Feature Presentation for ... - Usenix
Introduction Service availability is critical to business function Large scale failures often require slow, manual restoration Maintenance of next-nearest fallback configuration is painful Traditional Anycast deployments scale poorly with capacity
Failover Techniques Backend failure
Failover Techniques Load Balancer failure, site failure
Anycast Anycast is a network routing technique where many hosts have the exact same IP address. Clients trying to reach that IP address are routed to the nearest host.
Architecture
Combining Load Balancing and Anycast Reduced amount of route advertisers Reduced number of routing changes Tolerates LB failure No need for manual configuration to define failover location No need for manual intervention to deal with LB failure
...and turning it into a service Many services per location One load balancing instance per location Centralized management for it all Simple to use to by other service owners/sysadmins
Implementation Details - Load Balancer
Software details Heartbeat Active-passive cluster resource management ldirectord Backend monitoring software Patched to add "fallback command" ip_vs Linux kernel module for load balancing Quagga Software implementation of routing protocol daemons Advertises availability of services using /32 routes
If a new service owner wants to use it... Reserve IP on the Anycast subnet. Create the new Anycast VIP config: Same as a normal/local VIP Plus a "fallback command" Done.
Reference links Load Balancing, http://en.wikipedia.org/wiki/Load_balancing_(computing) The Linux Virtual Server Project, http://www.linuxvirtualserver.org High Availability, http://www.linux-ha.org Quagga, a software routing suite, http://www.quagga.net RFC1771 - A Border Gateway Protocol 4, http://www.faqs.org/rfcs/rfc1771. html Ldirectord, http://www.vergenet.net/linux/ldirectord/
