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

cmdo

cmdo(1m)																  cmdo(1m)

NAME

       cmdo - Execute process on multiple remote Serviceguard nodes.

SYNOPSIS

       cmdo [[-n node_name]...] [-t timeout] command

DESCRIPTION

       cmdo will execute a process on a multiple remote Serviceguard nodes and return any output or return value.

       cmdo  is  limited in several ways. cmdo is best suited for situations where other remote execution facilities are not available. For a more
       full featured tool for remote execution within a cluster, see cexec(1m) provided by Distributed Systems Administration Utilities.

       To use this command, the local user must have the root access role on each of the involved nodes.  For  more  information  on  Serviceguard
       access control policies, see the manual, Managing Serviceguard.

       To  use the cmdo command without specifying -n options, the local node must be configured into a Serviceguard cluster. If no -n options are
       specified, the command will be executed on all available nodes in the cluster.

       The command will be executed in an environment which matches the local node.  All environment variables defined locally will  be  available
       on the remote node.

       Output  from  stderr  and stdout for the remote process will be combined and delivered in one transmission. This command should not be used
       for interactive commands or commands which will return large quantities of output.  Output from each node will be displayed sequentially as
       the operation is executed on each remote node.

       Input via stdin is not supported.

       Killing the cmdo process does not stop any remote executions of the command.  cmdo should not be used on any command which may hang without
       specifying a timeout value.

   Options And Arguments
	      -t timeout
		   Kill the executed command if it does not exit within the specified timeout (in seconds)

	      -n node_name
		   Serviceguard node to execute command on. If no -n options are specified, all the nodes configured in the cluster are used.

	      command
		   Command to execute on remote node. May be quoted.

RETURN VALUE

       cmdo returns the following values:

	       0   Successful completed on all nodes.
	       >0  Command failed on one or more nodes with the specified exit value.
EXAMPLES

       Execute an 'ls' in a remote directory on all nodes within the cluster.
	      cmdo ls /tmp
       Execute an 'ls' in a remote directory on two nodes not configured within a Serviceguard cluster.
	      cmdo -n node1 -n node2 ls /tmp
AUTHOR

       cmdo was developed by HP.
SEE ALSO

       cexec(1m), cmcp(1m), cmexec(1m), cmsync(1m), cmquerycl(1m), cmviewcl(1m)

						      Requires Optional Serviceguard Software						  cmdo(1m)