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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asadmin-list-virtual-servers

asadmin-list-virtual-servers(1AS)				   User Commands				 asadmin-list-virtual-servers(1AS)

NAME

       asadmin-list-virtual-servers, list-virtual-servers - gets the virtual servers

SYNOPSIS

       list-virtual-servers --user admin_user [--password admin_password] [--host localhost] [--port 4848] [--secure|-s] [--passwordfile filename]
       [--terse=false] [--echo=false] [--interactive=true]

       Gets all the virtual server elements. This command is supported in remote mode only.

OPTIONS

       --user		       authorized domain application server administrative username.

       --password	       password to administer the domain application server.

       --host		       machine name where the domain application server is running.

       --port		       port number of the domain application server listening for administration requests.

       --secure 	       if true, uses SSL/TLS to communicate with the domain application server.

       --passwordfile	       file containing the domain application server password.

       --terse		       indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well-
			       formatted data for consumption by a script. Default is false.

       --echo		       setting to true will echo the command line statement on the standard output. Default is false.

       --interactive	       if set to true (default), only the required password options are prompted.

       Example 1: Using list-virtual-servers

       asadmin> list-virtual-servers --user admin --password adminadmin
       --host localhost --port 4848
       Command list-virtual-servers executed successfully

EXIT STATUS

       0		       command executed successfully

       1		       error in executing the command

       asadmin-create-virtual-server(1AS), asadmin-delete-virtual-server(1AS)

J2EE 1.4 SDK							    March 2004					 asadmin-list-virtual-servers(1AS)