How to write systemd service to start stop wso2 server in RHEL7 CentOS7

In rhel7/centos7 we use systemd services.

One of the major changes in RHEL  / CentOS 7.0 is the swtich to systemd, a system and service manager, that replaces SysV and Upstart used in previous releases of Red Hat Enterprise Linux. 

Ex.

#systemctl start myservice.service

Here I explain how to write systemd service in rhel7 to work with any wso2 (carbon) server.

Before creating systemd service we have create a service call file in your wso2Home/bin directory (if not exist a service file),

#cd <wso2HOME>/bin

#vi myService.sh

Then add below code to the file,

#!bin/sh
USER="user"           

PRODUCT_CODE="DSS"                               

CARBON_HOME="wso2HOME"               

LOCK_FILE="${CARBON_HOME}/wso2carbon.lck"

PID_FILE="${CARBON_HOME}/wso2carbon.pid"

CMD="${CARBON_HOME}/bin/wso2server.sh"  

JAVA_HOME="/opt/jdk1.7.0_60"          

export JAVA_HOME=$JAVA_HOME

# Status the service

status() {

 if [ -f $PID_FILE ]

     then

  PID=`cat $PID_FILE`

  ps -fp $PID > /dev/null 2>&1

  PIDVAL=$?

     else

  PIDVAL=3

 fi

 if [ $PIDVAL -eq 0 ]

     then

  echo "WSO2 $PRODUCT_CODE server is running ..."

     else

  echo "WSO2 $PRODUCT_CODE server is stopped."

 fi

 return $PIDVAL

}

# Start the service

start() {

 if [ -f $PID_FILE ]

     then

  PID=`cat $PID_FILE`

  ps -fp $PID > /dev/null 2>&1

  PIDVAL=$?

     else

  PIDVAL=3

 fi

 if [ $PIDVAL -eq 0 ]

     then

        echo "WSO2 $PRODUCT_CODE server is running ..."

     else

        echo -n "Starting WSO2 $PRODUCT_CODE server: "

        touch $LOCK_FILE

        su - $USER -c "$CMD start > /dev/null 2>&1 &"

        sleep 5

        if [ -f $PID_FILE ]

     then

   PID=`cat $PID_FILE`

   ps -fp $PID > /dev/null 2>&1

   PIDVAL=$?

   if [ $PIDVAL -eq 0 ]

       then

    echo "success"

       else

    echo "failure"

   fi

     else

   echo "failure"

   PIDVAL=2

        fi

 fi

 echo

 return $PIDVAL

}

# Restart the service

restart() {

 echo -n "Restarting WSO2 $PRODUCT_CODE server: "

 touch $LOCK_FILE

 su - $USER -c "$CMD restart > /dev/null 2>&1 &"

 sleep 15

 if [ -f $PID_FILE ]

     then

  PID=`cat $PID_FILE`

  ps -fp $PID > /dev/null 2>&1

  PIDVAL=$?

  if [ $PIDVAL -eq 0 ]

      then

   echo "success"

      else

   echo "failure"

  fi

     else

  echo "failure"

  PIDVAL=2

 fi

 echo

 return $PIDVAL

}

# Stop the service

stop() {

 if [ -f $PID_FILE ]

     then

  PID=`cat $PID_FILE`

  ps -fp $PID > /dev/null 2>&1

  PIDVAL=$?

  if [ $PIDVAL -eq 0 ]

      then

   echo -n "Stopping WSO2 $PRODUCT_CODE server: "

   su - $USER -c "$CMD stop > /dev/null 2>&1 &"

   rm -f $LOCK_FILE

   sleep 10

   PID=`cat $PID_FILE`

   ps -fp $PID > /dev/null 2>&1

   PIDVAL=$?

   if [ $PIDVAL -eq 0 ]

       then

    echo "failure"

    PIDVAL=2

       else

    echo "success"

    PIDVAL=0

   fi

      else

         echo "WSO2 $PRODUCT_CODE server is not running."

         PIDVAL=0

  fi

     else

        echo "WSO2 $PRODUCT_CODE server is not running."

        PIDVAL=0

 fi

 echo

 return $PIDVAL

}

### main logic ###

case "$1" in

start)

    start

    ;;

stop)

    stop

    ;;

status)

    status

    ;;

restart|reload|condrestart)

    restart

    ;;

*)

   echo $"Usage: $0 {start|stop|restart|reload|status}"

   exit 1

esac

exit $?

Change first 7 lines with your data. Reffere exmples in comments.

Now let’s create systemd service,

Systemd services are located in /etc/systemd/system directory.go to the directory,

#cd /etc/systemd/system

Create a file with .service extention(this will be service you are going to use),

#vi myservice.service

Then add below code to your created file,

[Unit]

Description=Wso2 Identity Server

After=syslog.target network.target

[Service]

Type=oneshot

ExecStart=/<wso2serverHOME>/bin/myService.sh start

ExecStop=/<wso2serverHOME>/bin/ myService.sh stop

RemainAfterExit=yes

StandardOutput=syslog

StandardError=syslog

[Install]

WantedBy=multi-user.target

That’s all. Now you have successfully created the systemd service.

Check the service using below commands and accessing wso2 product consoles,

#systemctl start myservice.service

#systemctl start myservice.service

** note that if you face any error starting stopping the service, check privileges granted to the service.