Install and configure zabbix agent on OpenNode or CentOS/RHEL host

on-zbx-agentinstall.sh

#!/bin/bash
# Copyright (C) 2013, OpenNode LLC. All rights reserved.
# Email: info@opennodecloud.com
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# DESCRIPTION:
# Install and configure zabbix agent on OpenNode or CentOS/RHEL host

# Config
CONFIG_FILE=/etc/zabbix/zabbix_agentd.conf
ZBX_REPO_KEY=http://repo.zabbixzone.com/centos/RPM-GPG-KEY-zabbixzone
ZBX_REPO_RPM=http://repo.zabbixzone.com/centos/zabbixzone-release-0.0-1.noarch.rpm

usage()
{
    echo 'Usage: on-zbx-agentinstall.sh -h -e -s <zabbix_server>'
    cat << EOF

Options:
        -h     help
        -e     start and enable zabbix agent on boot
	-s     zabbix server hostname/ip

EOF
    exit 1
}

chkZbxAgent()
{
    [ -z "$(rpm -qa|grep zabbix-agent)" ] && ZBX_AGENT="no" || ZBX_AGENT="yes"
    if [ "x${ZBX_AGENT}" = "xno" ]; then
        # Check for EPEL zabbix20 version of agent package
    	if [ -z "$(rpm -qa|grep zabbix20-agent)" ]; then
            ZBX_AGENT="no"
        else
            ZBX_AGENT="yes"
            CONFIG_FILE=/etc/zabbix_agentd.conf
        fi
    fi
    echo "Zabbix agent installed: ${ZBX_AGENT}"
}

chkZbxAgentVersion()
{
    ZBX_AGENT_VERSION=`zabbix_agent -V | head -1 | awk '{ print $3 }'`
    echo "Zabbix agent version: ${ZBX_AGENT_VERSION}"
    echo "Zabbix agent config: ${CONFIG_FILE}"
}

chkOnHost()
{
    [ -z "$(rpm -qa|grep opennode)" ] && ON_HOST="no" || ON_HOST="yes"
    echo "OpenNode OS host: ${ON_HOST}"
}

setZbxServer()
{
    echo "Setting Zabbix server to: ${ZBX_SERVER}"
    sed -i "s/\(^Server *= *\).*/\1$ZBX_SERVER/" $CONFIG_FILE
}

setZbxServerActive()
{
    echo "Setting Zabbix active checks server to: ${ZBX_SERVER}"
    sed -i "s/\(^ServerActive *= *\).*/\1$ZBX_SERVER/" $CONFIG_FILE
}

setZbxAgentHostname()
{
    echo "Setting Zabbix agent hostname to: ${HOSTNAME}"
    sed -i "s/\(^Hostname *= *\).*/\1$HOSTNAME/" $CONFIG_FILE
}

installZbxAgent()
{
    echo "Installing zabbix agent..."
    yum install zabbix-agent -y
}

installZbxRepo()
{
    echo "Installing zabbixzone yum repository..."
    rpm --import $ZBX_REPO_KEY
    rpm -Uv $ZBX_REPO_RPM
}

enableZbxAgent()
{
    echo "Enabling Zabbix agent..."
    service zabbix-agent restart && chkconfig zabbix-agent on
}

# MAIN
while getopts "hes:" opt; do
    case $opt in
      h)
        usage >&2
        ;;
      e)
        ENABLE_AGENT=yes
        ;;
      s)
        ZBX_SERVER=$OPTARG
        ;;
      \?)
        echo "Invalid option: -$OPTARG" >&2
        usage
        ;;
      :)
        echo "Option -$OPTARG requires an argument." >&2
        usage
        ;;
    esac
done

if [ -z "$ZBX_SERVER" ]; then
    echo "Zabbix server name option missing!"
    usage
    exit 1
fi

chkZbxAgent
if [ "x${ZBX_AGENT}" = "xno" ]; then
    chkOnHost
    if [ "x${ON_HOST}" = "xno" ]; then
        installZbxRepo
    fi
    installZbxAgent
fi

chkZbxAgentVersion
setZbxServer
setZbxServerActive
setZbxAgentHostname

if [ "x${ENABLE_AGENT}" = "xyes" ]; then
    enableZbxAgent
fi
exit 0

wget -q -O - https://gist.github.com/mainframe/5646082/raw/on-zbx-agentinstall.sh > on-zbx-agentinstall.sh
chmod 700 on-zbx-agentinstall.sh
./on-zbx-agentinstall.sh -s 10.0.0.4 -e