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|
#!/bin/sh
# ctdb event script for checking local file system utilization
[ -n "$CTDB_BASE" ] ||
CTDB_BASE=$(d=$(dirname "$0") && cd -P "$d" && dirname "$PWD")
. "${CTDB_BASE}/functions"
load_script_options
ctdb_setup_state_dir "service" "system-monitoring"
validate_percentage()
{
case "$1" in
"") return 1 ;; # A failure that doesn't need a warning
[0-9] | [0-9][0-9] | 100) return 0 ;;
*)
echo "WARNING: ${1} is an invalid percentage in \"${2}\" check"
return 1
;;
esac
}
check_thresholds()
{
_thing="$1"
_thresholds="$2"
_usage="$3"
_unhealthy_callout="$4"
case "$_thresholds" in
*:*)
_warn_threshold="${_thresholds%:*}"
_unhealthy_threshold="${_thresholds#*:}"
;;
*)
_warn_threshold="$_thresholds"
_unhealthy_threshold=""
;;
esac
_t=$(echo "$_thing" | sed -e 's@/@SLASH_@g' -e 's@ @_@g')
# script_state_dir set by ctdb_setup_state_dir()
# shellcheck disable=SC2154
_cache="${script_state_dir}/cache_${_t}"
if [ -r "$_cache" ]; then
read -r _prev <"$_cache"
else
_prev=0
fi
if validate_percentage "$_unhealthy_threshold" "$_thing"; then
if [ "$_usage" -ge "$_unhealthy_threshold" ]; then
printf 'ERROR: %s utilization %d%% >= threshold %d%%\n' \
"$_thing" \
"$_usage" \
"$_unhealthy_threshold"
# Only run unhealthy callout if passing the
# unhealthy threshold. That is, if the
# previous usage was below the threshold.
if [ "$_prev" -lt "$_unhealthy_threshold" ]; then
eval "$_unhealthy_callout"
fi
echo "$_usage" >"$_cache"
exit 1
fi
fi
if validate_percentage "$_warn_threshold" "$_thing"; then
if [ "$_usage" -ge "$_warn_threshold" ]; then
if [ "$_usage" = "$_prev" ]; then
return
fi
printf 'WARNING: %s utilization %d%% >= threshold %d%%\n' \
"$_thing" \
"$_usage" \
"$_warn_threshold"
echo "$_usage" >"$_cache"
else
if [ ! -r "$_cache" ]; then
return
fi
printf 'NOTICE: %s utilization %d%% < threshold %d%%\n' \
"$_thing" \
"$_usage" \
"$_warn_threshold"
rm -f "$_cache"
fi
fi
}
set_monitor_filsystem_usage_defaults()
{
_fs_defaults_cache="${script_state_dir}/cache_filsystem_usage_defaults"
if [ ! -r "$_fs_defaults_cache" ]; then
# Determine filesystem for each database directory, generate
# an entry to warn at 90%, de-duplicate entries, put all items
# on 1 line (so the read below gets everything)
for _t in "${CTDB_DBDIR:-${CTDB_VARDIR}}" \
"${CTDB_DBDIR_PERSISTENT:-${CTDB_VARDIR}/persistent}" \
"${CTDB_DBDIR_STATE:-${CTDB_VARDIR}/state}"; do
df -kP "$_t" | awk 'NR == 2 { printf "%s:90\n", $6 }'
done | sort -u | xargs >"$_fs_defaults_cache"
fi
read -r CTDB_MONITOR_FILESYSTEM_USAGE <"$_fs_defaults_cache"
}
monitor_filesystem_usage()
{
if [ -z "$CTDB_MONITOR_FILESYSTEM_USAGE" ]; then
set_monitor_filsystem_usage_defaults
fi
# Check each specified filesystem, specified in format
# <fs_mount>:<fs_warn_threshold>[:fs_unhealthy_threshold]
for _fs in $CTDB_MONITOR_FILESYSTEM_USAGE; do
_fs_mount="${_fs%%:*}"
_fs_thresholds="${_fs#*:}"
if [ ! -d "$_fs_mount" ]; then
echo "WARNING: Directory ${_fs_mount} does not exist"
continue
fi
# Get current utilization
_fs_usage=$(df -kP "$_fs_mount" |
sed -n -e 's@.*[[:space:]]\([[:digit:]]*\)%.*@\1@p')
if [ -z "$_fs_usage" ]; then
printf 'WARNING: Unable to get FS utilization for %s\n' \
"$_fs_mount"
continue
fi
check_thresholds "Filesystem ${_fs_mount}" \
"$_fs_thresholds" \
"$_fs_usage"
done
}
# shellcheck disable=SC2317
# Called indirectly via check_thresholds()
dump_memory_info()
{
get_proc "meminfo"
ps auxfww
set_proc "sysrq-trigger" "m"
}
monitor_memory_usage()
{
# Defaults
if [ -z "$CTDB_MONITOR_MEMORY_USAGE" ]; then
CTDB_MONITOR_MEMORY_USAGE=80
fi
_meminfo=$(get_proc "meminfo")
# Intentional word splitting here
# shellcheck disable=SC2046
set -- $(echo "$_meminfo" | awk '
$1 == "MemAvailable:" { memavail += $2 }
$1 == "MemFree:" { memfree += $2 }
$1 == "Cached:" { memfree += $2 }
$1 == "Buffers:" { memfree += $2 }
$1 == "MemTotal:" { memtotal = $2 }
$1 == "SwapFree:" { swapfree = $2 }
$1 == "SwapTotal:" { swaptotal = $2 }
END {
if (memavail != 0) { memfree = memavail ; }
if (memtotal + swaptotal != 0) {
usedtotal = memtotal - memfree + swaptotal - swapfree
print int(usedtotal / (memtotal + swaptotal) * 100)
} else {
print 0
}
}')
_mem_usage="$1"
check_thresholds "System memory" \
"$CTDB_MONITOR_MEMORY_USAGE" \
"$_mem_usage" \
dump_memory_info
}
case "$1" in
monitor)
# Load/cache database options from configuration file
ctdb_get_db_options
rc=0
monitor_filesystem_usage || rc=$?
monitor_memory_usage || rc=$?
exit $rc
;;
esac
exit 0
|
