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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corosync-cfgtool

COROSYNC-CFGTOOL(8)													       COROSYNC-CFGTOOL(8)

NAME

       corosync-cfgtool - An administrative tool for corosync.

SYNOPSIS

       corosync-cfgtool [-i] [IP_address] [-s] [-r] [-l] [-u] [-H] [service_name] [-v] [version] [-k] [nodeid] [-a] [nodeid]

DESCRIPTION

       corosync-cfgtool A tool for displaying and configuring active parameters within corosync.

OPTIONS

       -h     Print basic usage.

       -i     Finds only information about the specified interface IP address.

       -s     Displays	the  status  of the current rings on this node.  If any interfaces are faulty, 1 is returned by the binary.  If all inter-
	      faces are active 0 is returned to the shell.

       -r     Reset redundant ring state cluster wide after a fault to re-enable redundant ring operation.

       -l     Load a service identified by "service_name".

       -u     Unload a service identified by "service_name".

       -a     Display the IP address(es) of a node.

       -k     Kill a node identified by node id.

       -R     Tell all instances of corosync in this cluster to reload corosync.conf

       -H     Shutdown corosync cleanly on this node.

SEE ALSO

       corosync_overview(8),

AUTHOR

       Angus Salkeld

								    2010-05-30						       COROSYNC-CFGTOOL(8)