We are going to set up very simple keepalived IP failover on Ubuntu 14.04. Keepalived is a piece of software which can be used to achieve high availability by assigning two or more nodes a virtual IP and monitoring those nodes, failing over when one goes down. Keepalived can do more, like load balancing and monitoring, but this tutorial focusses on a very simple setup, just IP failover.

Internally keepalived uses VRRP. The VRRP protocol ensures that one of participating nodes is master. The backup node(s) listens for multicast packets from a node with a higher priority. If the backup node fails to receive VRRP advertisements for a period longer than three times of the advertisement timer, the backup node takes the master state and assigns the configured IP(s) to itself. In case there are more than one backup nodes with the same priority, the one with the highest IP wins the election. 继续阅读 →

Keepalived provides a strong and robust health checking for LVS clusters. It implements a framework of health checking on multiple layers for server failover, and VRRPv2 stack to handle director failover. How do I install and configure Keepalived for reverse proxy server such as nginx or lighttpd?

If your are using a LVS director to loadbalance a server pool in a production environment, you may want to have a robust solution for healthcheck & failover. This will also work with reverse proxy server such as nginx. 继续阅读 →

Keepalived is used for IP failover between two servers. It facilities for load balancing and high-availability to Linux based infrastructures. It works on VRRP ( Virtual Router Redundancy Protocol ) protocol. We have running two load balance servers using HAProxy and now we need to implement VRRP between both servers. This tutorial will help you to configure KeepAlived, Use this tutorial to configure HAProxy on both servers. 继续阅读 →