Web servers Archive

Loadbalancing / failover with IPVS and keepalived

Introduction Correct failover and loadbalancing is crucial for high availablility environment. With proper setup we can eliminate single points of failure in case of server crash. I use linux kernel’s support for load balancing, since that seems as well documented and scalable method. What I want to achieve here, is actually fully redundant architecture, so

Polipo: Easy Transparent proxy

When your server numbers grow and you have clusters you want to upgrade all at one time, you will probably want some kind of proxy that will cache stuff for you. Upgrading cluster of hadoop with like 10 servers, can take up to 2hours just to download packages to all nodes, since Cloudera limits bandwidth