Starts/stop deamons for elasticsearch

es-manager.sh

#!/bin/bash

# SETTINGS
USAGE="USAGE: ./es-manager.sh [start|stop] {instances to start}"
ERROR_INT="ERROR: second paramter must be an integer or none."
ERROR_ESHOME="ERROR: Environmental variable ES_HOME is not set."
PID_DIR="pid"

# print error is ES_HOME is not set
if [ -z ${ES_HOME+x} ]
then
    echo $ERROR_ESHOME > /dev/stderr;
    exit 1
fi

# parse input
MODE=$1
START_COUNT=$2

# make directory for pids
mkdir $PID_DIR 2> /dev/null

if [ "$1" == "start" ]
then

    # set count of instances to 1 if none is provided
    if [ -z $START_COUNT ]
    then
        START_COUNT="1"
    fi

    # check if count is a nubmer
    if ! [ "$START_COUNT" -eq "$START_COUNT" ] 2>/dev/null
    then
        echo $ERROR_INT
        echo $USAGE
        exit 1
    fi

    # start elasticsearch
    for i in `seq 1 $START_COUNT`
    do
        sh $ES_HOME/bin/elasticsearch -d -p "pid/$i"
        echo "instance #$i started"
        sleep 1
    done
    exit 0
fi

if [ "$MODE" == "stop" ]
    then

    # stop elasticsearch
    for pid in "$PID_DIR"/*
    do
        kill `cat "$pid"`
    done

    exit 0
fi

# print usage if no operation was executed
echo $USAGE
exit 1