怎么样使用shell脚本进行服务器系统监控？

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