keepalived #3

Supports: trusty
Add to new model

Description

keepalived is used for monitoring real servers within a Linux Virtual Server (LVS) cluster. keepalived can be configured to remove real servers from the cluster pool if it stops responding, as well as send a notification email to make the admin aware of the service failure. In addition, keepalived implements an independent Virtual Router Redundancy Protocol (VRRPv2; see rfc2338 for additional info) framework for director failover.


Overview

Keepalived is a routing software written in C. The main goal of this project is to provide simple and robust facilities for loadbalancing and high-availability to Linux system and Linux based infrastructures. Loadbalancing framework relies on well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 loadbalancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage loadbalanced server pool according their health. On the other hand high-availability is achieved by VRRP protocol. VRRP is a fundamental brick for router failover. In addition, Keepalived implements a set of hooks to the VRRP finite state machine providing low-level and high-speed protocol interactions. Keepalived frameworks can be used independently or all together to provide resilient infrastructures.

Usage

Once ready, deploy as follows:

juju deploy keepalived
juju add-relation haproxy keepalived

Configuration

router-id
(int) Virtual router identifier - a number between 1 and 255 that's unique within the network segment
virtual-ip
(string) Virtual IP/netmask that will be moved between instances, e.g.: 10.1.2.3/16