Runbook: nginx health checker

rb-nginx-check.sh

#!/bin/bash
## nginx health check
## -------------------------------------------------
## This script will check if nginx is up or down. It will exit with a 0 status if nginx is up,
## and exit with a 1 status if nginx is down.
## This script also integrates cr-webhook.sh which is a notification script that sends a webhook
## request to a specified monitor at runbook.io. To use this script without the runbook webhook
## simply leave RUNBOOK_NOTIFY set to False.

## Runbook.io settings
# You can find these in the Runbook API Details at the bottom of all monitor creation pages
CHECK_KEY=""
MONITOR_URL=""
RUNBOOK_NOTIFY="False"

notify () { 
  if [ $1 == "True" ]
  then
    echo "nginx is $4, notifying runbook"
    wget -O /var/tmp/cr-webhook.sh https://raw.githubusercontent.com/madflojo/runbook-webhook/master/cr-webhook.sh 2> /dev/null  > /dev/null
    if [ $? -eq 0 ]
    then
      chmod 755 /var/tmp/cr-webhook.sh
      /var/tmp/cr-webhook.sh -k $2 -u $3 -a $4 
      if [ $? -eq 0 ]
      then
        echo "Runbook notified"
        if [ $4 == "healthy" ]
        then
          exit 0
        else
          exit 1
        fi
      else
        echo "Error notifying Runbook"
        exit 1
      fi
    else
      echo "Could not download cr-webhook.sh"
      exit 1
    fi
  else
    echo "nginx is $4"
    if [ $4 == "healthy" ]
    then
      exit 0
    else
      exit 1
    fi
  fi
}

## Defaulting with ubuntu location
PIDFILE=/var/run/nginx.pid

if [ -r $PIDFILE ]
then
  PID=$(cat $PIDFILE)
  CHK=$(ps -p $PID)
  if [ $? -eq 0 ]
  then
    notify $RUNBOOK_NOTIFY $CHECK_KEY $MONITOR_URL "healthy"
  else
    notify $RUNBOOK_NOTIFY $CHECK_KEY $MONITOR_URL "failed"
  fi  
else
  CHK=$(ps -eo pid,cmd | grep -v grep | grep -c "nginx: master")
  if [ $CHK -ge 1 ]
  then
    notify $RUNBOOK_NOTIFY $CHECK_KEY $MONITOR_URL "healthy"
  else
    notify $RUNBOOK_NOTIFY $CHECK_KEY $MONITOR_URL "failed"
  fi
fi