nagios tomcat open files check

here is a quick and dirty little script to see how many open files tomcat is using up.

#!/bin/bash
USER=tomcat
LSOF=`lsof -u $USER | wc -l`
OPEN_F=`ulimit -a | egrep "open files" | awk '{print $4}'`
#PERCDONE=$(( $LSOF / $OPENF * 100 ))
PERCDONE_PRE=$(echo "scale=2;(($LSOF/$OPEN_F) * 100)" |bc)
PERCDONE=`echo $PERCDONE_PRE | cut -d. -f1`

if [ $PERCDONE -lt 84 ]; then
  printf "OK  -- $PERCDONE %% with $LSOF files open\n"
  exit 0
else
  if [ $PERCDONE -ge 85 ] && [ $PERCDONE -le 94 ]; then
    printf "WARN -- $PERCDONE %% with $LSOF files open\n"
    exit 1
  elif [ $PERCDONE -ge 95 ]; then
    printf "CRIT -- $PERCDONE %% with $LSOF files open\n"
    exit 2
  fi
fi

• I made a few quick mods to this that make it a bit more flexible. Still very much in beta, but it seems to work ok with minimal testing:

  #!/bin/bash
  # Stolen from http://pissedoffadmins.com/?p=650
  # Modified by Aaron McKinnon

  PROGNAME=`/bin/basename $0`

  print_usage() {
  echo “Usage: $PROGNAME -u username -w -c ”
  echo “Usage: $PROGNAME –help”
  echo “Example: $PROGNAME -u tomcat -w 85 -c 95”
  }

  # Make sure the correct number of command line
  # arguments have been supplied
  if [ $# -lt 3 ]; then
  print_usage
  exit $STATE_UNKNOWN
  fi

  # Grab the command line arguments
  exitstatus=$STATE_WARNING #default
  while test -n “$1”; do
  case “$1” in
  –help)
  print_help
  exit $STATE_OK
  ;;
  -h)
  print_help
  exit $STATE_OK
  ;;
  -u)
  USER=$2
  shift
  ;;
  -w)
  WARN=$2
  shift
  ;;
  -c)
  CRIT=$2
  shift
  ;;
  *)
  echo “Unknown argument: $1”
  print_usage
  exit $STATE_UNKNOWN
  ;;
  esac
  shift
  done

  # Idiot check that the user exists
  id $USER> /dev/null
  RUSER=`echo $?`
  if [ “$RUSER” != “0” ]; then
  echo -e “\nUser does not exist!\n”
  exit
  fi

  # The actual check
  LSOF=`lsof -u $USER | wc -l`
  OPEN_F=`ulimit -a | egrep “open files” | awk ‘{print $4}’`
  PERCDONE_PRE=$(echo “scale=2;(($LSOF/$OPEN_F) * 100)” |bc)
  PERCDONE=`echo $PERCDONE_PRE | cut -d. -f1`

  if [ $PERCDONE -lt $WARN ]; then
  printf “OK — $PERCDONE %% with $LSOF files open\n”
  exit 0
  else
  if [ $PERCDONE -ge $WARN ] && [ $PERCDONE -le $CRIT ]; then
  printf “WARN — $PERCDONE %% with $LSOF files open\n”
  exit 1
  elif [ $PERCDONE -ge $CRIT ]; then
  printf “CRIT — $PERCDONE %% with $LSOF files open\n”
  exit 2
  fi
  fi

  Thanks for the jumping off point!

  -Aaron

  Reply

  • very cool. i like what you did there.

    Reply

• Nice work.

  I think you has to change the line:

  OPEN_F=`ulimit -a | egrep “open files” | awk ‘{print $4}’`

  to

  OPEN_F=`su -m $USER -c “ulimit -n”`

  su -m nexus -c “ulimit -n”

  Reply

  • ignore the last line – please.

    Reply

    • OPEN_F=`su -m $USER -c “ulimit -n”` has to be changed to:

      OPEN_F=`sudo su -m $USER -c “ulimit -n”`

      Don´t forget to edit your sudoers file!

      Reply

    • OPEN_F=`su -m $USER -c “ulimit -n”` has to be changed to:

      OPEN_F=`sudo su -m $USER -c “ulimit -n”`

      Don´t forget to edit your sudoers file!

      Reply