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 HPUX

cmruncl

cmruncl(1m)															       cmruncl(1m)

NAME

       cmruncl - run a high availability cluster

SYNOPSIS

       cmruncl [-f] [-v] [-n node_name...]  [-t | -w none]

DESCRIPTION

       cmruncl causes all nodes in a configured cluster or all nodes specified to start their cluster daemons and form a new cluster.

       To  start  a  cluster,  a user must either be superuser(UID=0), or have an access policy of FULL_ADMIN allowed in the cluster configuration
       file. See access policy in cmquerycl(1m).

       This command should only be run when the cluster is not active on any of the configured nodes.  This command verifies the network  configu-
       ration  before  causing	the nodes to start their cluster daemons.  If a cluster is already running on a subset of the nodes, the cmrunnode
       command should be used to start the remaining nodes and force them to join the existing cluster.

       If node_name is not specified, the cluster daemons will be started on all the nodes in the cluster.  All  nodes	in  the  cluster  must	be
       available for the cluster to start unless a subset of nodes is specified.

   Options
       cmruncl supports the following options:

	      -f	Force cluster startup without warning message and continuation prompt that are printed with the -n option.

	      -v	Verbose output will be displayed.

	      -t	Test  only.  Provide  an assessment of the package placement without affecting the current state of the nodes or packages.
			The -w option is not required with the -t option as -t does not validate network connectivity, but assumes  that  all  the
			nodes can meet any external dependencies such as EMS resources, package subnets, and storage.

	      -n  node_name...
			Start the cluster daemon on the specified subset of node(s).

	      -w none	By default network probing is performed to check that the network connectivity is the same as when the cluster was config-
			ured. Any anomalies are reported before the cluster daemons are started. The -w none option  disables  this  probing.  The
			option should only be used if this network configuration is known to be correct from a recent check.

       RETURN VALUE
	      cmruncl returns the following value:

	       0   Successful completion.
	       1   Command failed.

EXAMPLES

       Run the cluster daemon:

	      cmruncl

       Run the cluster daemons on node1 and node2:

	      cmruncl -n node1 -n node2

AUTHOR

       cmruncl was developed by HP.

SEE ALSO

       cmquerycl(1m), cmhaltcl(1m), cmhaltnode(1m), cmrunnode(1m), cmviewcl(1m), cmeval(1m).

						      Requires Optional Serviceguard Software					       cmruncl(1m)