怎么样使用shell脚本进行服务器系统监控？

#!/usr/bin/ksh

WORKFILE="/tmp/df.work" # Holds filesystem data

>$WORKFILE # Initialize to empty

OUTFILE="/tmp/df.outfile" # Output display file

>$OUTFILE# Initialize to empty

EXCEPTIONS="/usr/local/bin/exceptions" # Override data file

DATA_EXCEPTIONS="/tmp/dfdata.out" # Exceptions file w/o # rows

THISHOST=`hostname`# Hostname of this machine

MIN_MB_FREE="50MB" # Min. MB of Free FS Space

function check_exceptions

{

# set -x # Uncomment to debug this function

while read FSNAME FSLIMIT

do

# Do an NFS sanity check

echo $FSNAME | grep ":" >/dev/null /

&& FSNAME=$(echo $FSNAME | cut -d ":" -f2)

if [[ ! -z "$FSLIMIT" && "$FSLIMIT" != '' ]]

then

(( FSLIMIT = $(echo $FSLIMIT | sed s/MB//g) * 1024 ))

if [[ $FSNAME = $FSMOUNT ]]

then

# Get rid of the "MB" if it exists

FSLIMIT=$(echo $FSLIMIT | sed s/MB//g)

if (( $FSMB_FREE < $FSLIMIT ))

then

return 1 # Found out of limit

else

return 2 # Found OK

fi

fi

fi

done < $DATA_EXCEPTIONS # Feed the loop from the bottom!!!

return 3 # Not found in $EXCEPTIONS file

}

######## START OF MAIN #############

if [[ -s $EXCEPTIONS ]]

then

# Ignore all line beginning with a pound sign, #

# and omit all blank lines

cat $EXCEPTIONS | grep -v "^#" | sed /^$/d > $DATA_EXCEPTIONS

fi

# Get the data of interest by stripping out the

# /cdrom row and keeping columns 1, 4 and 6

df -k | tail +2 | egrep -v '/cdrom' /

| awk '{print $1, $4, $6}' > $WORKFILE

# Format Variables for the proper MB value

(( MIN_MB_FREE = $(echo $MIN_MB_FREE | sed s/MB//g) * 1024 ))

# Loop through each line of the file and compare column 2

while read FSDEVICE FSMB_FREE FSMOUNT

do

if [[ -s $EXCEPTIONS ]]

then

check_exceptions

RC="$?"

if [ $RC -eq 1 ] # Found out of exceptions limit

then

(( FS_FREE_OUT = $FSMB_FREE / 1000 ))

echo "$FSDEVICE mounted on $FSMOUNT only has ${FS_FREE_OUT}MB Free" /

>> $OUTFILE

elif [ $RC -eq 2 ] # Found in exceptions to be OK

then # Just a sanity check - We really do nothing here...

# The colon, :, is a NO-OP operator in KSH

: # No-Op - Do Nothing!

elif [ $RC -eq 3 ] # Not found in the exceptions file

then

FSMB_FREE=$(echo $FSMB_FREE | sed s/MB//g) # Remove the "MB"

if (( $FSMB_FREE < $MIN_MB_FREE ))

then

(( FS_FREE_OUT = $FSMB_FREE / 1000 ))

echo "$FSDEVICE mounted on $FSMOUNT only has ${FS_FREE_OUT}MB Free" /

>> $OUTFILE

fi

fi

else # No Exceptions file use the script default

FSMB_FREE=$(echo $FSMB_FREE | sed s/MB//g) # Remove the "MB"

if (( $FSMB_FREE < $MIN_MB_FREE ))

then

(( FS_FREE_OUT = $FSMB_FREE / 1000 ))

echo "$FSDEVICE mounted on $FSMOUNT only has ${FS_FREE_OUT}MB Free" /

>> $OUTFILE

fi

fi

done < $WORKFILE

if [[ -s $OUTFILE ]]

then

echo "/nFull Filesystem(s) on $THISHOST/n"

cat $OUTFILE

print

fi

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