156 lines
5.6 KiB
Bash
Executable file
156 lines
5.6 KiB
Bash
Executable file
#!/bin/sh
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# Little Nagios/Icinga/Naemon probe for Linux disks' I/O via /proc/diskstats
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#
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# Based on https://www.kernel.org/doc/html/latest/admin-guide/iostats.html
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#
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# Published under Unlicense <http://unlicense.org/> (similar to public domain)
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PROGPATH=$( echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,' )
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REVISION="0.1"
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# Stop at the first non-catched error
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set -e
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# Include check_range()
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# Not needed at the moment
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#. $PROGPATH/utils.sh
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STATE_OK=0
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STATE_WARNING=1
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STATE_CRITICAL=2
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STATE_UNKNOWN=3
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STATE_DEPENDENT=4
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# Default values
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WARNING_STATS=0
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CRITICAL_STATS=0
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# Output
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OUTPUT_EXIT_STATUS=$STATE_OK
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OUTPUT_DETAIL_OK=""
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OUTPUT_DETAIL_WARNING=""
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OUTPUT_DETAIL_CRITICAL=""
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OUTPUT_PERFDATA=""
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#
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# Help function
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#
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usage() {
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cat <<EOF
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Usage :
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$0 [ -i <nb_in_progress_warn_threshold> ] [ -I <nb_in_progress_crit_threshold> ] -d <device_name> [ ... -d ... ]
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This probe send statistics about disks on a Linux system.
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At the moment, the "number of IO in progress" (field #9) is the only metric
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able to generate an alert.
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Options :
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-d xx Device name (usually 'sda'). Can use shell pattern like 'sda*' or 'sd?'.
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-i N Number of io in progress : warning threshold
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-I N Number of io in progress : critical threshold
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Example :
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This example is a good generic configuration for simple and light systems,
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whether physical or virtual, taking any sda, sdb, vda, vdb, etc. disks found
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and triggering a warning at 1 IO in progress and an alert at 5.
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$0 -w 0 -W 5 -d 'sd?' -d 'vd?'
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EOF
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}
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# Some early checks
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if [ ! -r "/proc/diskstats" ]; then
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echo "UNKNOWN file '/proc/diskstats' not found or not readable."
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exit $STATE_UNKNOWN
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fi
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# TODO: check Linux kernel version. See differences between 2.4+, 2.6+, 4.18+
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# https://www.kernel.org/doc/html/latest/admin-guide/iostats.html
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#
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# Loop on parameters + tests
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#
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while getopts hd:i:I: OPT; do
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case "$OPT" in
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'd')
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while read \
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MAJOR MINOR DEVICE_NAME \
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READS_COMPLETED READS_MERGED SECTORS_READ TIME_SPENT_READING \
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WRITES_COMPLETED WRITES_MERGED SECTORS_WRITTEN TIME_SPENT_WRITING \
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IO_IN_PROGRESS \
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TIME_SPENT_IO TIME_SPENT_IO_WEIGHTED \
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DISCARDS_MERGED SECTORS_DISCARDED TIME_SPENT_DISCARDING \
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FLUSH_REQUESTS TIME_SPENT_FLUSHING \
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FUTURE_THINGIES
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do
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case "$DEVICE_NAME" in
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$OPTARG)
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# Checking the thresholds
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if [ -n "$THRESHOLD_IO_IN_PROGRESS_CRITICAL" ] && [ "$IO_IN_PROGRESS" -gt "$THRESHOLD_IO_IN_PROGRESS_CRITICAL" ]; then
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OUTPUT_EXIT_STATUS=$STATE_CRITICAL
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OUTPUT_DETAIL_CRITICAL="$OUTPUT_DETAIL_CRITICAL I/O in progress on $DEVICE_NAME: $IO_IN_PROGRESS"
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fi
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if [ -n "$THRESHOLD_IO_IN_PROGRESS_WARNING" ] && [ "$OUTPUT_EXIT_STATUS" != "$STATE_CRITICAL" ] && [ "$IO_IN_PROGRESS" -gt "$THRESHOLD_IO_IN_PROGRESS_WARNING" ]; then
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OUTPUT_EXIT_STATUS=$STATE_WARNING
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OUTPUT_DETAIL_WARNING="$OUTPUT_DETAIL_WARNING I/O in progress on $DEVICE_NAME: $IO_IN_PROGRESS"
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fi
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# Generating performance data
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# reads
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OUTPUT_PERFDATA="$( printf "%s\n'%s_reads_completed'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$READS_COMPLETED" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_reads_merged'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$READS_MERGED" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_sectors_read'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$SECTORS_READ" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_time_spent_reading'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$TIME_SPENT_READING" )"
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# writes
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OUTPUT_PERFDATA="$( printf "%s\n'%s_writes_completed'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$WRITES_COMPLETED" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_writes_merged'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$WRITES_MERGED" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_sectors_written'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$SECTORS_WRITTEN" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_time_spent_writing'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$TIME_SPENT_WRITING" )"
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# I/O
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OUTPUT_PERFDATA="$( printf "%s\n'%s_io_in_progress'=%d;%s;%s;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$IO_IN_PROGRESS" "$THRESHOLD_IO_IN_PROGRESS_WARNING" "$THRESHOLD_IO_IN_PROGRESS_CRITICAL" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_time_spent_io'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$TIME_SPENT_IO" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_time_spent_io_weighted'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$TIME_SPENT_IO_WEIGHTED" )"
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# Discards
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OUTPUT_PERFDATA="$( printf "%s\n'%s_discards_merged'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$DISCARDS_MERGED" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_sectors_discarded'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$SECTORS_DISCARDED" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_time_spent_discarding'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$TIME_SPENT_DISCARDING" )"
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# Flushes
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OUTPUT_PERFDATA="$( printf "%s\n'%s_flush_requests'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$FLUSH_REQUESTS" )"
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OUTPUT_PERFDATA="$( printf "%s\n'%s_time_spent_flushing'=%dc;;;0" "$OUTPUT_PERFDATA" "$DEVICE_NAME" "$TIME_SPENT_FLUSHING" )"
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;;
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esac
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done < /proc/diskstats
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;;
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'i')
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THRESHOLD_IO_IN_PROGRESS_WARNING="$OPTARG"
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;;
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'I')
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THRESHOLD_IO_IN_PROGRESS_CRITICAL="$OPTARG"
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;;
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\?)
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usage
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exit 1
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;;
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esac
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done
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# Final ouput
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case "$OUTPUT_EXIT_STATUS" in
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'0')
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printf "OK%s" "$OUTPUT_DETAIL_OK"
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;;
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'1')
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printf "WARNING%s" "$OUTPUT_DETAIL_WARNING"
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;;
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'2')
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printf "CRITICAL%s" "$OUTPUT_DETAIL_CRITICAL"
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;;
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*)
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printf "UNKNOWN"
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;;
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esac
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# We sort the perfdata because of a weird bug in some icinga/pnp4nagios interactions
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printf "|%s\n" "$( printf "%s" "$OUTPUT_PERFDATA" | sort | grep -v "^$" | tr "\n" " " )"
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exit $OUTPUT_EXIT_STATUS
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