Run Solr as daemon

sorld.sh

#!/usr/bin/env bash

SOLR_RUNNING=0
SOLR_DIRECTORY="/usr/local/solr"
SOLR_LOG="${SOLR_DIRECTORY}/logs/solrd.log"
SOLR_LOCK="${SOLR_DIRECTORY}/solrd.pid"
touch "${SOLR_LOCK}"
SOLR_PID=$(cat ${SOLR_LOCK})
let SOLR_PID=SOLR_PID+0
touch "${SOLR_LOG}"
chmod 0777 "${SOLR_LOG}"

solr_check()
{
    if [ "${SOLR_PID}" -gt 0 ] && [ $(ps -p ${SOLR_PID} | wc -l) -eq 2 ]
    then
        SOLR_RUNNING=1
    else
        SOLR_RUNNING=0
    fi
}

solr_status()
{
    solr_check

    if [ ${SOLR_RUNNING} -eq 1 ]
    then
        echo "Solr is running with the PID ${SOLR_PID}"
    else
        echo "Solr is not running"
    fi
}

solr_start()
{
    solr_check

    if [ ${SOLR_RUNNING} -eq 0 ]
    then
        cd "${SOLR_DIRECTORY}"
        java -Dsolr.solr.home=. -jar start.jar > "${SOLR_LOG}" 2>&1 &
        SOLR_PID="$!"
        echo "${SOLR_PID}" > "${SOLR_LOCK}"
        echo "Starting Solr with the PID ${SOLR_PID}"
    else
        echo "Solr is already running with the PID ${SOLR_PID}"
    fi
}

solr_stop()
{
    solr_check

    if [ ${SOLR_RUNNING} -eq 1 ]
    then
        echo "Stopping Solr (PID ${SOLR_PID})"
        kill -KILL ${SOLR_PID}
        :>"${SOLR_LOCK}"
    else
        echo "Solr is not running"
    fi
}

case ${1} in

    start)
        solr_start
        exit 0
    ;;

    stop)
        solr_stop
        exit 0
    ;;

    restart)
        solr_stop
        solr_start
        exit 0
    ;;

    status)
        solr_status
        exit 0
    ;;

    *)
        echo "Usage: ${0} {start|stop|restart|status}" 1>&2
        exit 2
    ;;

esac