Ha mailserver, is possible active/active with "constant" connection? Post: 303045628

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Top Forums UNIX for Advanced & Expert Users Ha mailserver, is possible active/active with "constant" connection? Post 303045628 by hicksd8 on Saturday 4th of April 2020 02:09:53 PM

04-04-2020

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You problem is with network timeout settings; either the cluster or the clients.

Manually shutting down one of the cluster nodes may not give you the same result as a true CPU/power/whatever failure because the cluster software suite will probably see you do that. It would be better to simply pull out the RJ45 network connection to one of them simulating a network connection failure.

Anyway, the point is that a cluster failover takes time. During this time the virtual ip address is switched from one node to the other. Depending on the cluster suite this will take seconds/minutes. The fact that the client will reconnect to the surviving cluster node after you restart it proves that, had it waited long enough, it would have been able to reconnect on its own.

So the solution is to either (1) configure the cluster to failover faster, or (2) increase the timeout that clients will wait before giving up. That means that a new connection to the virtual ip address can be made before the configured timeout period ends.

hicksd8

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LEARN ABOUT DEBIAN

crmd

CRM 
DAEMON(7)						      Pacemaker Configuration						     CRM DAEMON(7)

NAME

       crmd - CRM Daemon Options

SYNOPSIS

       [dc-version=string] [cluster-infrastructure=string] [dc-deadtime=time] [cluster-recheck-interval=time] [election-timeout=time]
       [shutdown-escalation=time] [crmd-integration-timeout=time] [crmd-finalization-timeout=time] [crmd-transition-delay=time]
       [expected-quorum-votes=integer]

DESCRIPTION

       This is a fake resource that details the options that can be configured for the CRM Daemon.

SUPPORTED PARAMETERS

       dc-version = string [none]
	   Version of Pacemaker on the cluster's DC.

	   Includes the hash which identifies the exact Mercurial changeset it was built from. Used for diagnostic purposes.

       cluster-infrastructure = string [heartbeat]
	   The messaging stack on which Pacemaker is currently running.

	   Used for informational and diagnostic purposes.

       dc-deadtime = time [20s]
	   How long to wait for a response from other nodes during startup.

	   The "correct" value will depend on the speed/load of your network and the type of switches used.

       cluster-recheck-interval = time [15min]
	   Polling interval for time based changes to options, resource parameters and constraints.

	   The Cluster is primarily event driven, however the configuration can have elements that change based on time. To ensure these changes
	   take effect, we can optionally poll the cluster's status for changes. Allowed values: Zero disables polling. Positive values are an
	   interval in seconds (unless other SI units are specified. eg. 5min)

       election-timeout = time [2min]
	   *** Advanced Use Only ***.

	   If need to adjust this value, it probably indicates the presence of a bug.

       shutdown-escalation = time [20min]
	   *** Advanced Use Only ***.

	   If need to adjust this value, it probably indicates the presence of a bug.

       crmd-integration-timeout = time [3min]
	   *** Advanced Use Only ***.

	   If need to adjust this value, it probably indicates the presence of a bug.

       crmd-finalization-timeout = time [30min]
	   *** Advanced Use Only ***.

	   If you need to adjust this value, it probably indicates the presence of a bug.

       crmd-transition-delay = time [0s]
	   *** Advanced Use Only *** Enabling this option will slow down cluster recovery under all conditions

	   Delay cluster recovery for the configured interval to allow for additional/related events to occur. Useful if your configuration is
	   sensitive to the order in which ping updates arrive.

       expected-quorum-votes = integer [2]
	   The number of nodes expected to be in the cluster

	   Used to calculate quorum in openais based clusters.

AUTHOR

       Andrew Beekhof <andrew@beekhof.net>
	   Author.

Pacemaker Configuration 					    04/17/2012							     CRM DAEMON(7)