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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ocf_heartbeat_rsyncd

OCF_HEARTBEAT_RSYNCD(7) 					OCF resource agents					   OCF_HEARTBEAT_RSYNCD(7)

NAME

       ocf_heartbeat_rsyncd - Manages an rsync daemon

SYNOPSIS

       rsyncd [start | stop | monitor | meta-data | validate-all]

DESCRIPTION

       This script manages rsync daemon

SUPPORTED PARAMETERS

       binpath
	   The rsync binary path. For example, "/usr/bin/rsync" (optional, string, default rsync)

       conffile
	   The rsync daemon configuration file name with full path. For example, "/etc/rsyncd.conf" (optional, string, default /etc/rsyncd.conf)

       bwlimit
	   This option allows you to specify a maximum transfer rate in kilobytes per second. This option is most effective when using rsync with
	   large files (several megabytes and up). Due to the nature of rsync transfers, blocks of data are sent, then if rsync determines the
	   transfer was too fast, it will wait before sending the next data block. The result is an average transfer rate equaling the specified
	   limit. A value of zero specifies no limit.  (optional, string, no default)

SUPPORTED ACTIONS

       This resource agent supports the following actions (operations):

       start
	   Starts the resource. Suggested minimum timeout: 20s.

       stop
	   Stops the resource. Suggested minimum timeout: 20s.

       monitor
	   Performs a detailed status check. Suggested minimum timeout: 20s. Suggested interval: 60s.

       validate-all
	   Performs a validation of the resource configuration. Suggested minimum timeout: 20s.

       meta-data
	   Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5s.

EXAMPLE

       The following is an example configuration for a rsyncd resource using the crm(8) shell:

	   primitive p_rsyncd ocf:heartbeat:rsyncd 
	     op monitor depth="0" timeout="20s" interval="60s"

SEE ALSO

       http://www.linux-ha.org/wiki/rsyncd_(resource_agent)

AUTHOR

       Linux-HA contributors (see the resource agent source for information about individual authors)

resource-agents UNKNOWN 					    03/09/2014						   OCF_HEARTBEAT_RSYNCD(7)