High availability of a process between two Linux servers Post: 302979163

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Top Forums Shell Programming and Scripting High availability of a process between two Linux servers Post 302979163 by stomp on Wednesday 10th of August 2016 08:26:28 AM

08-10-2016

Registered User

Hi Mahesh,

doing HA with a simple shell-script may sound convenient for a first start, but a fast hacked together shell script is probably not at all what you want to do when you have HA in mind.

If you want to do it right, use corosync and pacemaker or some other HA-toolstack to build a stable cluster. That's not easy and requires considerable effort to learn, but it is a solid and stable solution.

A simple but far less hacky method than own shell scripts is using UCARP. UCARP is a small piece of software that hooks 2 or more servers together which check if each other is reachable. The "primary" node sets up the configured service ip and can launch an "up-script" after taking the service ip. So the connection between service-ip and service is a fairly good for such a type of easy-peasy-HA. I did that and the advantage of this is that UCARP is very easy to configure. The whole handling of who is master, who is slave and who is reachable and who not is done by UCARP.

Last edited by stomp; 08-10-2016 at 06:49 PM..

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votequorum_overview

VOTEQUORUM_OVERVIEW(8)				    Corosync Cluster Engine Programmer's Manual 			    VOTEQUORUM_OVERVIEW(8)

NAME

       votequorum_overview - Votequorum Library Overview

OVERVIEW

       The  votequorum library is delivered with the corosync project. It is the external interface to the vote-based quorum service. This service
       is optionally loaded into all nodes in a corosync cluster to avoid split-brain situations. It  does  this  by  having  a  number  of  votes
       assigned  to  each system in the cluster and ensuring that only when a majority of the votes are present, cluster operations are allowed to
       proceed.

       The library provides a mechanism to:

       * Query the quorum status

       * Get a list of nodes known to the quorum service

       * Receive notifications of quorum state changes

       * Change the number of votes assigned to a node

       * Change the number of expected votes for a cluster to be quorate

       * Connect an additional quorum device to allow small clusters to remain quorate during node outages.

BUGS

       No known bugs at the time of writing. The authors are from outerspace. Deal with it.

SEE ALSO

       corosync-quorumtool(8), votequorum(5), votequorum_initialize(3), votequorum_finalize(3),  votequorum_getinfo(3),  votequorum_trackstart(3),
       votequorum_trackstop(3),   votequorum_fd_get(3),  votequorum_dispatch(3),  votequorum_context_set(3),  votequorum_context_get(3),  votequo-
       rum_setexpected(3), votequorum_setvotes(3)

corosync Man Page						    2012-01-12						    VOTEQUORUM_OVERVIEW(8)