setup.sh

#!/bin/bash

VERSION=5.5.3
LOG=/tmp/elklog
rm -f $LOG

## Source Common Functions
curl -s "https://raw.githubusercontent.com/linuxautomations/scripts/master/common-functions.sh" >/tmp/common-functions.sh
#source /root/scripts/common-functions.sh
source /tmp/common-functions.sh

Stat() {
    if [ "$1" = 0 ];then 
        success "$2"
    elif [ "$1" = 10  ]; then 
        warning "$2"
    else 
        error "$2"
        exit 1
    fi
}

## Checking Root User or not.
CheckRoot

## Checking SELINUX Enabled or not.
CheckSELinux

## Checking Firewall on the Server.
CheckFirewall

## Installing Java
yum install java -y &>>$LOG 
Stat $? "Installing Java"

## Installing Elastic Search
el_install() {
    URL="https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-$VERSION.rpm"
    rpm -q elasticsearch &>>$LOG 
    if [ $? -eq 0 ]; then 
        Stat 10 "Elastic Search already installed"
    else 
        yum install $URL -y &>>$LOG
        Stat $? "Installing Elastic Search"
    fi

    ps -ef | grep '/etc/elasticsearch' | grep -v grep &>>$LOG 
    if [ $? -eq 0 ]; then 
        Stat 10 'Elastic Search already running'
    else 
        systemctl enable elasticsearch &>$LOG 
        systemctl start elasticsearch 
        i=0
        while [ $i -lt 10 ] ; do 
            netstat -lntp | grep 9200 &>/dev/null 
            if [ $? -eq 0 ]; then 
                break 
            else 
                sleep 10 
                i=$(($i+1))
            fi 
        done 
        curl localhost:9200 &>>$LOG 
        Stat $? "Starting Elastic Search"
    fi
}


## Installing LogStash 
ls_install() {
    URL="https://artifacts.elastic.co/downloads/logstash/logstash-$VERSION.rpm"
    rpm -q logstash &>>$LOG 
    [ $? -eq 0 ] && Stat 10 'LogStash already installed' && return
    yum install $URL -y &>>$LOG
    Stat $? "Installing LogStash"
}

ls_start() {
    ps -ef | grep 'logstash/runner.rb' | grep -v grep &>>$LOG 
    [ $? -eq 0 ] && Stat 10 'LogStash already running' && return 
    systemctl enable logstash &>>$LOG 
    systemctl start logstash 
    Stat $? "Starting LogStash"
}


## Installing Kibana
ki_install() {
    URL="https://artifacts.elastic.co/downloads/kibana/kibana-$VERSION-x86_64.rpm"
    rpm -q kibana &>/dev/null 
    [ $? -eq 0 ] && Stat 10 'Kibana alredy installed' && return
    yum install $URL -y &>>$LOG 
    Stat $? 'Installing Kibana'
}

## Starting Kibana
ki_start() {
    ps -ef | grep '/etc/kibana/kibana.yml' | grep -v grep &>>$LOG 
    [ $? -eq 0 ] && Stat 10 'Kibana already running' && return
    sed -i -e '/^server.port/ d ' -e '/^#server.port/ a server.port: 5601' -e '/^server.host/ d' -e '/^#server.host/ a server.host: "0.0.0.0"' /etc/kibana/kibana.yml
    systemctl enable kibana &>>$LOG
    systemctl start kibana &>>$LOG
    Stat $? 'Starting Kibana'
}



### Main Program
el_install
ls_install 
ls_start
ki_install
ki_start