#!/bin/bash

# installs the zabbix agent and configures it

# make sure we are running as sudo
if [ "$EUID" -ne 0 ]; then
  echo "Please run as root"
  exit
fi

# create temp directory for downloaded files
DIRECTORY="/tmp/zabbix_install"
mkdir ${DIRECTORY}

if [ -f /etc/debian_version ]; then
    apt update
    apt install -y snmpd curl
elif [ -f /etc/redhat-release ]; then
    yum install -y net-snmp net-snmp-utils
    firewall-cmd --zone=public --add-service=snmp --permanent
    firewall-cmd --reload
else
    echo "Unable to determine linux distro"
    exit
fi

# download the correct file for the correct OS
FILENAME="zabbix_repo.deb"
DEBIAN_URL="http://repo.zabbix.com/zabbix/3.4/debian/pool/main/z/zabbix-release/zabbix-release_3.4-1+stretch_all.deb"
#CENTOS_URL="http://repo.zabbix.com/zabbix/3.4/rhel/7/x86_64/zabbix-release-3.4-2.el7.noarch.rpm"
#UBUNTU_URL="https://repo.zabbix.com/zabbix/3.4/ubuntu/pool/main/z/zabbix-release/zabbix-release_3.4-1%2Bbionic_all.deb"
wget --output-document=${DIRECTORY}/${FILENAME} $DEBIAN_URL

# install the repo
dpkg --install ${DIRECTORY}/${FILENAME}

ZABBIX_SERVER="gauntzabbix.home.johnhgaunt.com"

# update the cache
apt update

# install the agent
apt install --assume-yes zabbix-agent

# ask for the hostname
read -e -p "Enter Hostname: " -i "$(cat /etc/hostname)" hostname

sed --in-place "s/^Hostname=Zabbix\ server/Hostname=${hostname}/" /etc/zabbix/zabbix_agentd.conf

sed --in-place "s/^Server=127.0.0.1/Server=${ZABBIX_SERVER}/" /etc/zabbix/zabbix_agentd.conf

sed --in-place "s/^ServerActive=127.0.0.1/ServerActive=${ZABBIX_SERVER}/" /etc/zabbix/zabbix_agentd.conf

systemctl restart zabbix-agent 

systemctl enable zabbix-agent