Creating an application resource apache2

When you define an application resource apache2, three commands or scripts must be provided by the user to:

• Start the application.

• Stop the application.

• Query the status of the application.

In this example, use the script

/cluster/scripts/apache2 

The script has the following content for a Linux® system:

#!/bin/bash

OPSTATE_ONLINE=1
OPSTATE_OFFLINE=2

Action=${1}

case ${Action} in
        start)
		        /usr/sbin/apache2ctl start >/dev/null 2>&1
		        logger -i -t "SAM-apache" "Apache started"
		        RC=0
		        ;;
	stop)
		        /usr/sbin/apache2ctl stop >/dev/null 2>&1
		        logger -i -t "SAM-apache" "Apache stopped"
		        RC=0
		        ;;
	status)
		        ps ax |grep -v "grep"|grep "/usr/sbin/httpd">/dev/null
		        if [ $? == 0 ]
		        then
			        RC=${OPSTATE_ONLINE}
		        else
			        RC=${OPSTATE_OFFLINE}
		        fi
		        ;;
esac
exit $RC

The RSCT resource definitions for application resource apache2 are created with the mkrsrc command. All resource characteristics can be passed as command line parameters, but the mkrsrc command also accepts a definition file in plain text format.

The second approach with a definition file named apache2.def is used, as in the following example:

PersistentResourceAttributes:
   Name="apache2" 
   StartCommand="/cluster/scripts/apache2 start"
   StopCommand="/cluster/scripts/apache2 stop"
   MonitorCommand="/cluster/scripts/apache2 status"
   MonitorCommandPeriod=5                               
   MonitorCommandTimeout=5                         
   NodeNameList={"node01","node02","node03"}       
   StartCommandTimeout=10                             
   StopCommandTimeout=10                              
   UserName="root"                                         
   ResourceType=1                                  

The resource definition can now be created with the mkrsrc command by specifying the location and name of the definition file.

mkrsrc -f apache2.def IBM.Application   

The command does not return any output upon successful execution. You can display the floating resource representation of apache2 by entering the lsrsrc command:

lsrsrc -s "Name='apache2' && ResourceType=1" IBM.Application
Resource Persistent Attributes for IBM.Application
resource 1: 
			Name                  = "apache2" 
			ResourceType          = 1 
			AggregateResource     = "0x3fff 0xffff 0x00000000 0x000000000x00000000 0x00000000" 
			StartCommand          = "/cluster/scripts/apache2 start" 
			StopCommand           = "/cluster/scripts/apache2 stop" 
			MonitorCommand        = "/cluster/scripts/apache2 status" 
			MonitorCommandPeriod  = 5 
			MonitorCommandTimeout = 5 
			StartCommandTimeout   = 10 
			StopCommandTimeout    = 10 
			UserName              = "root" 
			RunCommandsSync       = 1 
			ProtectionMode        = 0 
			HealthCommand         = "" 
			HealthCommandPeriod   = 10 
			HealthCommandTimeout  = 5 
			InstanceName          = "" 
			InstanceLocation      = "" 
			SetHealthState        = 0 
			MovePrepareCommand    = "" 
			MoveCompleteCommand   = "" 
			MoveCancelCommand     = "" 
			CleanupList           = {} 
			CleanupCommand        = "" 
			CleanupCommandTimeout = 10 
			ProcessCommandString  = ""
			ResetState            = 0 
			ReRegistrationPeriod  = 0 
			CleanupNodeList       = {} 
			MonitorUserName       = "" 
			ActivePeerDomain      = "SA_Domain" 
			NodeNameList          = {"node01","node02”,”node03"}