使用shell脚本进行服务器系统监控——进程监控

#!/bin/ksh

typeset -u RUN_PRE_EVENT  # Force to UPPERCASE
typeset -u RUN_STARTUP_EVENT  # Force to UPPERCASE
typeset -u RUN_POST_EVENT # force to UPPERCASE

RUN_PRE_EVENT='N'  # A 'Y' will execute, anything else will not
RUN_STARTUP_EVENT='Y' # A 'Y' will execute, anything else will not
RUN_POST_EVENT='Y' # A 'Y' will execute, anything else will not

LOGFILE="/tmp/proc_status.log"
[[ ! -s $LOGFILE ]] && touch $LOGFILE

SCRIPT_NAME=$(basename $0)
TTY=$(tty)
INTERVAL="1" # Seconds between sampling
JOBS=

####################################################
############# DEFINE FUNCTIONS HERE ################
####################################################

usage ()
{
echo "/n/n/t*****USAGE ERROR*****"
echo "/n/nUSAGE:  $SCRIPT_NAME  seconds  process"
echo "/nWill monitor the specified process for the"
echo "specified number of seconds."
echo "/nUSAGE:  $SCRIPT_NAME  [-s|-S seconds] [-m|-M minutes]"
echo "        [-h|-H hours] [-d|-D days] [-p|-P process]/n"
echo "/nWill monitor the specified process for number of"
echo "seconds specified within -s seconds, -m minutes,"
echo "-h hours and -d days.  Any combination of command"
echo "switches can be used./n"
echo "/nEXAMPLE: $SCRIPT_NAME  300  dtcalc"
echo "/n/nEXAMPLE: $SCRIPT_NAME  -m 5 -p dtcalc"
echo "/nBoth examples will monitor the dtcalc process"
echo "for 5 minutes.  Can specify days, hours, minutes"
echo "and seconds, using -d, -h, -m and -s/n/n"
}

####################################################

trap_exit ()
{
# set -x # Uncommant to debug this function
# Log an ending time for process monitoring
echo "INTERRUPT: Program Received an Interrupt...EXITING..." > $TTY
echo "INTERRUPT: Program Received an Interrupt...EXITING..." >> $LOGFILE
TIMESTAMP=$(date +%D@%T) # Get a new time stamp...
echo "MON_STOPPED: Monitoring for $PROCESS ended ==> $TIMESTAMP/n" /
      >> $TTY
echo "MON_STOPPED: Monitoring for $PROCESS ended ==> $TIMESTAMP/n" /
      >> $LOGFILE
echo "LOGFILE: All Events are Logged ==> $LOGFILE /n" > $TTY

# Kill all functions
JOBS=$(jobs -p)
if [[ ! -z $JOBS && $JOBS != '' && $JOBS != '0' ]]
then
      kill $(jobs -p) 2>/dev/null 1>&2
fi
return 2
}

####################################################

pre_event_script ()
{
# Put anything that you want to execute BEFORE the
# monitored process STARTS in this function

: # No-OP - Needed as a place holder for an empty function
# Comment Out the Above colon, ':'

PRE_RC=$?
return $PRE_RC
}

####################################################
startup_event_script ()
{
# Put anything that you want to execute WHEN, or AS, the
# monitored process STARTS in this function

: # No-OP - Needed as a place holder for an empty function
# Comment Out the Above colon, ':'

STARTUP_RC=$?
return $STARTUP_RC
}

####################################################

post_event_script ()
{
# Put anything that you want to execute AFTER the
# monitored process ENDS in this function

: # No-OP - Need as a place holder for an empty function
# Comment Out the Above colon, ':'

POST_RC=$?
return $POST_RC
}

####################################################

test_string ()
{
if (( $# != 1 ))
then
    echo 'ERROR'
    return
fi

C_STRING=$1

case $C_STRING in

     +([0-9])) echo  'POS_INT' # Integer >= 0
               ;;
     +([-0-9])) echo 'NEG_INT' # Integer < 0
               ;;
     +([a-z])) echo  'LOW_CASE'   # lower case text
               ;;
     +([A-Z])) echo  'UP_CASE'    # UPPER case text
               ;;
     +([a-z]|[A-Z])) echo 'MIX_CASE' # MIxed CAse text
               ;;
               *) echo 'UNKNOWN'  # Anything else
esac
}

####################################################

proc_watch ()
{
# set -x # Uncomment to debug this function

while :     # Loop Forever!!
do
    case $RUN in
    'Y')
          # This will run the startup_event_script, which is a function

          if [[ $RUN_STARTUP_EVENT = 'Y' ]]
          then
             echo "STARTUP EVENT: Executing Startup Event Script..." > $TTY
             echo "STARTUP EVENT: Executing Startup Event Script..." >> $LOGFILE

             startup_event_script # USER DEFINED FUNCTION!!!
             RC=$?
             if (( "RC" == 0 ))
             then
                  echo "SUCCESS: Startup Event Script Completed RC - ${RC}"/
   &