Learning OpenStack Networking - Third Edition

Load balancing algorithms

In version 2 of the LBaaS API, the following load balancing algorithms can be applied to a pool:

• Round robin
• Least connections
• Source IP

With the round robin algorithm, the load balancer passes each new connection to the next server in line. Over time, all connections will be distributed evenly across all machines being load balanced. Round robin is the least resource-intensive algorithm and has no mechanism to determine when a machine is being overwhelmed by connections. To avoid overwhelming a pool member, all members should be equal in terms of processing speed, connection speed, and memory.

With the least connections algorithm, the load balancer passes a new connection to a server that has the least number ...