104 lines
2.9 KiB
Bash
104 lines
2.9 KiB
Bash
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#!/usr/bin/env bash
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set -o errexit
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set -o nounset
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set -o pipefail
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warning_threshold=80
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critical_threshold=90
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top_count=10
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usage() {
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cat <<'USAGE'
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Usage: check_inode_usage.sh [--warning PERCENT] [--critical PERCENT] [--top N] [--help]
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Detect inode exhaustion using df -i.
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USAGE
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}
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is_number() {
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[[ "$1" =~ ^[0-9]+$ ]]
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}
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while (($# > 0)); do
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case "$1" in
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--warning) [[ $# -ge 2 ]] || { printf 'CRITICAL: --warning requires a value\n'; exit 2; }; warning_threshold="$2"; shift 2 ;;
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--critical) [[ $# -ge 2 ]] || { printf 'CRITICAL: --critical requires a value\n'; exit 2; }; critical_threshold="$2"; shift 2 ;;
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--top) [[ $# -ge 2 ]] || { printf 'CRITICAL: --top requires a value\n'; exit 2; }; top_count="$2"; shift 2 ;;
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--help|-h) usage; exit 0 ;;
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*) printf 'CRITICAL: unknown option: %s\n' "$1"; usage; exit 2 ;;
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esac
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done
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for value in "$warning_threshold" "$critical_threshold" "$top_count"; do
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if ! is_number "$value"; then
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printf 'CRITICAL: numeric option expected, got: %s\n' "$value"
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exit 2
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fi
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done
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if ((warning_threshold >= critical_threshold)); then
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printf 'CRITICAL: --warning must be lower than --critical\n'
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exit 2
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fi
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if ! command -v df >/dev/null 2>&1; then
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printf 'CRITICAL: required command not found: df\n'
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exit 2
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fi
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tmp_df="$(mktemp)"
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tmp_alerts="$(mktemp)"
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trap 'rm -f "$tmp_df" "$tmp_alerts"' EXIT
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df -Pi > "$tmp_df"
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awk -v warn="$warning_threshold" '
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NR > 1 {
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pct=$5
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gsub(/%/, "", pct)
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if (pct >= warn) {
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print $0
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}
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}
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' "$tmp_df" > "$tmp_alerts"
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max_pct="$(awk 'NR > 1 { pct=$5; gsub(/%/, "", pct); if (pct > max) max=pct } END { printf "%d", max }' "$tmp_df")"
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status="OK"
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exit_code=0
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if ((max_pct >= critical_threshold)); then
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status="CRITICAL"
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exit_code=3
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elif ((max_pct >= warning_threshold)); then
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status="WARNING"
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exit_code=1
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fi
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printf '%s: Highest inode usage is %s%%\n\n' "$status" "$max_pct"
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printf 'Filesystems above threshold:\n'
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if [[ -s "$tmp_alerts" ]]; then
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cat "$tmp_alerts"
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else
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printf 'OK: no filesystems above warning threshold\n'
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fi
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printf '\n'
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printf 'Inode usage table:\n'
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cat "$tmp_df"
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printf '\n'
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printf 'Top affected mount points:\n'
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awk 'NR > 1 { pct=$5; gsub(/%/, "", pct); print pct, $6, $1, $2, $3, $4 }' "$tmp_df" \
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| sort -rn | head -n "$top_count" \
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| awk '{ printf "%s%% %s %s inodes=%s used=%s free=%s\n", $1, $2, $3, $4, $5, $6 }'
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printf '\n'
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printf 'Evidence:\n'
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printf 'Thresholds: warning=%s%% critical=%s%%\n\n' "$warning_threshold" "$critical_threshold"
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printf 'Recommended next steps:\n'
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printf -- '- Find directories with many small files under affected mount points\n'
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printf -- '- Check logs, cache, spool, session, and temporary directories\n'
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printf -- '- Avoid deleting blindly; confirm ownership and application impact first\n'
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printf -- '- Confirm whether inode exhaustion is causing write or deploy failures\n'
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printf -- '- Attach this output to incident ticket\n'
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exit "$exit_code"
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