linux_wiki:xymon_cpu_load_threshold_calc

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linux_wiki:xymon_cpu_load_threshold_calc [2016/11/27 00:06]
billdozor created 		linux_wiki:xymon_cpu_load_threshold_calc [2019/05/25 23:50] (current)
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-====== Xymon Cpu Load Threshold Calc ======+====== Xymon CPU Load Threshold Calc ======
  
 **General Information** **General Information**
Line 21: Line 21:
 Installation instructions. Installation instructions.
  
-===== Client side =====+===== Xymon Client side =====
  
 No client modifications required. No client modifications required.
  
-===== Server side =====+---- 
 + 
 +===== Xymon Server side =====
  
   - Install the 'bc' package (allows bash string to floating point number conversion)   - Install the 'bc' package (allows bash string to floating point number conversion)
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 /root/scripts/cpu-load-calc.sh -v &> /root/scripts/cpu-load-calc.log</code> /root/scripts/cpu-load-calc.sh -v &> /root/scripts/cpu-load-calc.log</code>
 +
 +----
 +
 +====== The Script ======
 +
 +<code bash cpu-load-calc.sh>
 +#!/bin/bash
 +# Title: cpu-load-calc.sh
 +# Description: Calculate a xymon client's cpu load (Run on Xymon Server periodically with cron)
 +# Dependency: Requires 'bc' package
 +# Last Change: 2018-05-22
 +# Recent Changes:-Updated awk search to look for [nproc] at the beginning of the line
 +
 +#=======================
 +# Customize Here
 +#=======================
 +
 +# Warning and Critical Load Multipliers (num of procs * multiplier)
 +load_warn_multiplier=1.0
 +load_crit_multiplier=1.5
 +
 +# Directory to save auto load thresholds
 +auto_load_dir="/etc/xymon/analysis.d/auto-cpuload.d"
 +
 +# Xymon server's hostdata directory
 +xymon_hostdata_dir="/var/lib/xymon/hostdata"
 +
 +# Xymon server's main analysis config file
 +xymon_analysis_cfg="/etc/xymon/analysis.cfg"
 +#=======================
 +# End of Customize
 +#=======================
 +
 +#=======================
 +# Pre-Run Error Checking
 +#=======================
 +## Dependency Check ##
 +which bc &> /dev/null
 +if [[ $? -eq 1 ]]; then
 +  echo ">> Error! Dependent package 'bc' (byte code) not detected. Exiting..."
 +  exit 1
 +fi
 +
 +## Does the Auto Load Directory exist?
 +if [[ ! -d ${auto_load_dir} ]]; then
 +  echo ">> Error! The directory (${auto_load_dir}) does not exist or is not a directory. Exiting..."
 +  exit
 +fi
 +
 +## Write Access Check
 +touch ${auto_load_dir}/testfile &> /dev/null
 +if [[ $? -eq 1 ]]; then
 +  echo ">> Error! User '$(whoami)' does not have write access to ${auto_load_dir}! Exiting..."
 +  exit 1
 +else
 +  rm -f ${auto_load_dir}/testfile &> /dev/null
 +fi
 +
 +## Check if the auto_load_dir is included in main analysis config file
 +grep "^directory ${auto_load_dir}" ${xymon_analysis_cfg} &> /dev/null
 +if [[ $? -eq 1 ]]; then
 +  echo -e ">> Warning! Auto load directory (${auto_load_dir}) is not included in ${xymon_analysis_cfg}. Continuing, but auto CPU load settings will not take affect until 'directory ${auto_load_dir}' is added to ${xymon_analysis_cfg}.\n"
 +fi
 +#=======================
 +# End of Pre-Run Error Checking
 +#=======================
 +
 +#===============================
 +# Functions; Main starts after
 +#===============================
 +
 +function show_usage
 +{
 +  echo -e "\n####==== Xymon Client Auto Load Thresholds ====####"
 +  echo -e "\nDescripton: Calculate a xymon client's cpu load."
 +  echo -e "\n--Usage"
 +  echo -e "$0      => No arguments, configure with no verbosity."
 +  echo -e "$0 -v   => Verbose output."
 +  echo -e "$0 -r   => Refresh CPU load data (force hostdata update)."
 +  echo -e "$0 -h   => Display usage."
 +}
 +
 +# Force snapshots of hostdata
 +function force_hostdata
 +{
 +  # Use node name passed as argument
 +  node_name=${1}
 +
 +  # Lie to Xymon that the node's cpu is green, then yellow, forcing a hostdata snapshot
 +  xymon 127.0.0.1 "status ${node_name}.cpu green $(date)"
 +  xymon 127.0.0.1 "status ${node_name}.cpu yellow $(date)"
 +}
 +
 +#=======================
 +# Get Script Arguments
 +#=======================
 +# Reset POSIX variable in case it has been used previously in this shell
 +OPTIND=1
 +
 +# By default, no verbose output
 +verbose_output="no"
 +refresh_cpus="no"
 +
 +while getopts "hrv" opt; do
 +  case "${opt}" in
 +    h) # -h (help) argument
 +      show_usage
 +      exit 0
 +    ;;
 +    r) # -r (refersh cpus) argument
 +      refresh_cpus="yes"
 +    ;;
 +    v) # -v (verbose) argument
 +      verbose_output="yes"
 +    ;;
 +    *) # invalid argument
 +      show_usage
 +      exit 0
 +    ;;
 +  esac
 +done
 +
 +#=======================
 +# Main Program
 +#=======================
 +echo -e "== Xymon Client Auto Load Thresholds =="
 +echo -e "Load Warning Multiplier: ${load_warn_multiplier}"
 +echo -e "Load Critical Multiplier: ${load_crit_multiplier}"
 +echo -e "Saving configs to: ${auto_load_dir}"
 +
 +# For each node reporting host data
 +for node in $(ls ${xymon_hostdata_dir}); do
 +
 +  if [[ ${verbose_output} == "yes" ]]; then
 +    echo -e "\n>> Working on node: ${node}"
 +  fi
 +
 +  if [[ ${refresh_cpus} == "yes" ]]; then
 +    if [[ ${verbose_output} == "yes" ]]; then
 +      echo -e "\n-> Refreshing hostdata..."
 +    fi
 +    # Force an update of hostdata
 +    force_hostdata ${node}
 +  fi
 +
 +  # Get the number of procs reported from node's most recent host data file
 +  node_num_procs="$(cat ${xymon_hostdata_dir}/${node}/$(ls -tr ${xymon_hostdata_dir}/${node}/ | tail -1) | awk '/^\[nproc]/ { getline; print }')"
 +  
 +  # If node_num_procs is empty or not a number, move to the next node
 +  if [[ -z ${node_num_procs} || ! ${node_num_procs} =~ [0-9][0-9]* ]]; then
 +    # Did not find 'nproc' in the host data file or no number from nproc returned
 +
 +    if [[ ${verbose_output} == "yes" ]]; then
 +      echo "-> Warning! Could not find 'nproc' in ${node}'s host data file or no number returned. Skipping..."
 +    fi
 +
 +    continue
 +  fi
 +
 +  # Calculate the warning and critical load thresholds (normalize as a floating point with bc)
 +  load_warning=$(echo "${node_num_procs} * ${load_warn_multiplier}" | bc)
 +  load_critical=$(echo "${node_num_procs} * ${load_crit_multiplier}" | bc)
 +
 +  if [[ ${verbose_output} == "yes" ]]; then
 +    echo -e "-> Number of Procs: ${node_num_procs}"
 +    echo -e "-> Warning at: ${load_warning}"
 +    echo -e "-> Critical at: ${load_critical}"
 +    echo -e "-> Creating node analysis drop in file..."
 +  fi
 +
 +  # Create analysis drop in file
 +  echo "# ${node}'s CPU Load Thresholds (Warning Critical)" > ${auto_load_dir}/${node}.cfg
 +  echo "HOST=${node}" >> ${auto_load_dir}/${node}.cfg
 +  echo "  LOAD  ${load_warning}  ${load_critical}" >> ${auto_load_dir}/${node}.cfg
 +done
 +
 +echo -e "\n== Auto Load Thresholds Complete =="
 +
 +exit 0
 +</code>
  
 ---- ----
  
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  • Last modified: 2019/05/25 23:50
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