nagios_check_xenserver_vmstatus

#!/bin/bash
# Global variables:

PATH='/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin'
SCRIPT_PATH="${0}"
ARGS="${#}"
PARM1="${1}"
WARN="${2}"
PARM2="${3}"
CRIT="${4}"
XEN="sudo /opt/xensource/bin/xl list"

STATE_OK="0"
STATE_WARNING="1"
STATE_CRITICAL="2"
STATE_UNKNOWN="3"

# Functions:

  # exit function
  function die()
  {
    # output
    echo -e "Error in ${SCRIPT_PATH}:\n ${1}"

    # return state unknown
    exit ${STATE_UNKNOWN}
  }

  # Shows usage function.
  function fShowUsage()
  {
    echo -e "Usage: ${SCRIPT_PATH} -w <warning> -c <critical>\n
    -w = Minimum Number of Xen VMs to activate a warning message.
    -c = Number of Xen VMs to activate a critical message.\n\nVersion 2.0"
    exit ${STATE_UNKNOWN}
  }

  # The main function.
  function fMain()
  {
    # script o depends on:
    [ -x /opt/xensource/bin/xl ] || die "This script depends on /opt/xensource/bin/xl"

    # check for arguments:
    [ "${ARGS}" = 4 ] || fShowUsage

    # check for parameters
    [ "${PARM2}" = "-c" -o "${CRIT}" != "" ] || fShowUsage
    [ "${PARM1}" = "-h" -o "${WARN}" != "" ] || fShowUsage

    OUTPUT="$( ${XEN} )"
    NBVMS=$(echo "${RUNNING}" | wc -w)
    HNAME=$(hostname)

    # validate output
    ( echo "${OUTPUT}" | grep -q 'ID   Mem VCPUs      State' ) || die "Unexpected output from plugin!"


    echo -e "Xen Running =\n${OUTPUT}"

    # make results
    if [ "$NBVMS" -le "$CRIT" ]; then
        echo "Critical Xen VMs Usage - Total NB: $NBVMS - detected VMs: $RUNNING"
       exit ${STATE_CRITICAL}
    elif [ "$NBVMS" -le "$WARN" ]; then
        echo "Warning Xen VMs Usage - Total NB: $NBVMS - detected VMs: $RUNNING"
        exit ${STATE_WARNING}
    else
        echo "OK: Xen Hypervisor \"$HNAME\" is running Xen VMs: $RUNNING"
        exit ${STATE_OK}
    fi

  }

 # Start the program:
  fMain

 # Exit with previous return code:
  exit "${?}"