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8.0

Using PID to start, stop or restart server

Asked by saharey in Bourne-Again Shell (bash)

This is related to question
http://www.experts-exchange.com/Programming/Languages/Scripting/Shell/Q_24233454.html

I want to use contains of "server.pid" file which contains PID of my running server, so that I can start, stop and restart my server.
But the problem is that when I stop my tomcat server this file "server.pid" gets vanished so when I again try to start my server by giving "start" command it fails because
it is unable to find server.pid file which does not exist anymore.

Below is my code snippet from my server.sh file which I am using till date, but due to problem found (http://www.experts-exchange.com/Programming/Languages/Scripting/Shell/Q_24233454.html)
I need to again reengineer or rewrite my few methods.

This is what was suggested to me in my previous question: (My code snippet is in code snippet block)

function is_running() {
PID=`cat /path/to/server.pid`
if [ -n "${PID}" ]; then
RESULT=`ps ax | grep -w "^ *${PID}"`
if [ -z "${RESULT}" ]; then
# if you are here, than it means, that your app is not running
else
# if you are here, than it means, that your app is running
fi
fi
}

In my code snippet I want to replace these lines lines with above server.pid method:

In startServer()
RET=`$PS | grep java | grep "$XLRI_HOME" | grep -v grep`

In stopServer() all of such lines
RET=`$PS | grep java | grep "$XLRI_HOME" | grep -v grep`

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             #!/bin/sh
 
############################################################
# Set variables
############################################################
 
 
XLRI_HOME="{XLRI_HOME}"
JAVA_HOME="{JAVA_HOME}"
CATALINA_PID="$XLRI_HOME/bin/server.pid"
JXTA_HOME="$XLRI_HOME/server/.jxta"
export JAVA_HOME
export XLRI_HOME
export CATALINA_PID
export JXTA_HOME
 
 
 
# Tomcat/Catalina
CATALINA_HOME="$XLRI_HOME/tomcat"
CATALINA="$CATALINA_HOME/bin/catalina.sh"
GRAPH_OPTS="-Djava.awt.headless=true"
JAVA_OPTS="-server -Xms1024m -Xmx1024m -XX:NewSize=256m -XX:MaxNewSize=256m -XX:MaxPermSize=128m -XX:+HeapDumpOnOutOfMemoryError"
MESSAGE_OPTS="-Dmessages.home.dir=$XLRI_HOME"
JXTA_OPTS="-DJXTA_HOME=$JXTA_HOME"
CATALINA_OPTS="$GRAPH_OPTS $JXTA_OPTS $MESSAGE_OPTS"
# Java
export JAVA_OPTS
export CATALINA_HOME
export CATALINA_OPTS
 
 
# System
ARCH=`uname`
case $ARCH in
        Darwin) PS="/bin/ps auxwww";;
        Linux) PS="/bin/ps -ef";;
        SunOS) PS="/usr/ucb/ps -auxwww";;
        *) "Unknown arch type, exiting"; exit 1;;
esac
 
############################################################
# fail - Prints an error message and exits
############################################################
fail()
{
        echo
        echo "Error - $1"
        echo
        exit 1
}
 
############################################################
# checkHome - Verifies that the BAO Home
#             Directory exists
############################################################
checkHome()
{   
        if [ ! -d "$XLRI_HOME" ]
        then
                fail "XLRI_HOME does not point to a valid directory"
        fi
 
        if [ ! -d "$XLRI_HOME/tomcat" ]
        then
                fail "XLRI_HOME does not point to a valid XLRI Atrium Orchestrator install"
        fi
}
 
############################################################
# initialize - Initializes the environment
############################################################
initialize()
{
        # Validate XLRI_HOME
        if [ -z "$XLRI_HOME" ] 
        then
                XLRI_HOME=.
                export XLRI_HOME
        fi
 
        checkHome "$XLRI_HOME"
 
        # Validate catalina
        CATALINA="$XLRI_HOME/tomcat/bin/catalina.sh"
 
        if [ ! -x "$CATALINA" ]
        then
                fatal "Could not find tomcat start script: $CATALINA"
        fi
 
        # Sort out the Library Path
        umach=`uname -m`
        usysn=`uname -s`
 
        if [ "$ARCH" = "SunOS" ]
        then
                arch="sun4u"
        else 
        if [ "$umach" = "i686" ]
        then
                arch="x86"
        else
                arch=$umach
        fi
        fi
 
        if [ "$ARCH" = "SunOS" ]
    	    then
                os="SunOS"
        else if [ "$ARCH" = "Linux" ]
	        then
                os="linux"
        else if [ "$ARCH" = "Darwin" ]
	        then
                os="Darwin"
        fi
        fi
        fi
 
		if [ -d "$XLRI_HOME/lib/$arch/$os" ]
		then
			#echo "Skipping internal library setup"
			LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$XLRI_HOME/lib/$arch/$os
			export LD_LIBRARY_PATH
			CATALINA_OPTS="$CATALINA_OPTS -Djava.library.path=$LD_LIBRARY_PATH"
		fi     
}
 
############################################################
# startServer - Starts the server in the background
############################################################
startServer()
{
        # Verify that the sever isn't already started
        RET=`$PS | grep java | grep "$XLRI_HOME" | grep -v grep`                     
        
        if [ $? = 0 ]
        then
                fail "The server is already running."
        fi
 
        echo "Using CATALINA_OPTS:"
        for OPT in $CATALINA_OPTS
        do
                echo "     $OPT"
        done
        
        echo "Starting server..."
 
        "$CATALINA" start
 
        rc=$?
        echo "Return code is $rc"
}
 
############################################################
# stopSever - Stops the server gracefully 
############################################################
stopServer()
{
        # Verify that the server is running
        RET=`$PS | grep java | grep "$XLRI_HOME" | grep -v grep`
 
        if [ $? != 0 ]
        then
                fail "The server is not running."
        fi
 
        # timer and max_time are in seconds
        timer=0
        max_time=300
 
        if [ "$1" = "-force" ]
        then
                echo "Forcibly stopping server..."
                "$CATALINA" stop -force
        else
                echo "Gracefully stopping server..."
                "$CATALINA" stop
        fi
 
        rc=$?
        echo "Return code is $rc"
        printf "Stopping: ["
        if [ $rc = 0 ]
        then
                while [ $timer -lt $max_time ]
                do
                        printf "..."      
                                
                        RET=`$PS | grep java | grep "$XLRI_HOME" | grep -v grep`
 
                        if [ $? != 0 ]
                        then
                                echo "] - Stopped"
                                break
                        fi      
                
                        sleep 5;        
                        timer=`expr $timer + 5`
                done
        else
                for PID in `$PS | grep java | grep "$XLRI_HOME" | grep -v grep | awk '{ print $2 }'`
                do
			kill -3 $PID
                        kill -9 $PID
                done
                fail "An error occurred while stopping the server (killed process)"
        fi
        
        if [ $timer -eq $max_time ]
        then
        		echo "] - The server could not be stopped in $max_time seconds"
                echo "Killing the process..."
                
                for PID in `$PS | grep java | grep "$XLRI_HOME" | grep -v grep | awk '{ print $2 }'`
                do
			kill -3 $PID
                        kill -9 $PID
                done
                
                sleep 15;
        fi
 
        if [ -r "$CATALINA_PID" ]
        then
                rm "$CATALINA_PID"
        fi      
 
        # Stop rvd if running
        if [ $rc = 0 ]
        then
                RET=`$PS | grep "rvd -listen" | grep -v grep`
 
                if [ $? = 0 ] 
                then
                        echo "Killing rvd daemon"
 
                        for PID in `$PS | grep "rvd -listen" | grep -v grep | awk '{ print $2 }'`
                        do
                                kill -9 $PID
                        done
                fi
        else
                exit
        fi
}
############################################################
# status - Returns the status (Stopped/Running)
############################################################
status()
{
        RET=`$PS | grep java | grep "$XLRI_HOME" | grep -v grep`
 
        if [ $? != 0 ]
        then
                echo "The server is stopped"
        else
                echo "The server is running"
        fi
}
#####################################################
# Main execution
#####################################################
cmd=$1
opt=$2
initialize
 
if [ "$cmd" = "start" ]
then
        startServer
elif [ "$cmd" = "stop" ]
then
        stopServer $opt
elif [ "$cmd" = "restart" ]
then
        stopServer $opt
        startServer
elif [ "$cmd" = "status" ]
then
        status
else
        usage
fi

           
         

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Using PID to start, stop or restart server

Asked by saharey in Bourne-Again Shell (bash)

About this solution