Mateusz Suski
147 lines
4.0 KiB
Bash
Executable File
147 lines
4.0 KiB
Bash
Executable File
#!/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=75
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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_high_cpu.sh [--warning PERCENT] [--critical PERCENT] [--top N] [--help]
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Detect high CPU load and show top CPU-consuming processes.
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Exit codes:
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0 OK
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1 WARNING / operational issue detected
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2 invalid input / missing required dependency
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3 CRITICAL issue detected
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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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require_cmd() {
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if ! command -v "$1" >/dev/null 2>&1; then
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printf 'CRITICAL: required command not found: %s\n' "$1"
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exit 2
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fi
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}
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while (($# > 0)); do
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case "$1" in
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--warning)
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[[ $# -ge 2 ]] || { printf 'CRITICAL: --warning requires a value\n'; exit 2; }
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warning_threshold="$2"
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shift 2
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;;
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--critical)
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[[ $# -ge 2 ]] || { printf 'CRITICAL: --critical requires a value\n'; exit 2; }
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critical_threshold="$2"
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shift 2
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;;
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--top)
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[[ $# -ge 2 ]] || { printf 'CRITICAL: --top requires a value\n'; exit 2; }
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top_count="$2"
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shift 2
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;;
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--help|-h)
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usage
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exit 0
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;;
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*)
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printf 'CRITICAL: unknown option: %s\n' "$1"
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usage
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exit 2
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;;
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esac
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done
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for value in "$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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require_cmd ps
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require_cmd awk
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require_cmd head
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cpu_count=1
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if command -v getconf >/dev/null 2>&1; then
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cpu_count="$(getconf _NPROCESSORS_ONLN 2>/dev/null || printf '1')"
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elif [[ -r /proc/cpuinfo ]]; then
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cpu_count="$(grep -c '^processor' /proc/cpuinfo 2>/dev/null || printf '1')"
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fi
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[[ "$cpu_count" =~ ^[0-9]+$ ]] || cpu_count=1
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((cpu_count > 0)) || cpu_count=1
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load_1m="unavailable"
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load_5m="unavailable"
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load_15m="unavailable"
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load_per_cpu_pct=0
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if [[ -r /proc/loadavg ]]; then
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read -r load_1m load_5m load_15m _ < /proc/loadavg
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load_per_cpu_pct="$(awk -v load_avg="$load_1m" -v cpus="$cpu_count" 'BEGIN { printf "%d", (load_avg / cpus) * 100 }')"
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elif command -v uptime >/dev/null 2>&1; then
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load_line="$(uptime 2>/dev/null || true)"
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load_1m="$(printf '%s\n' "$load_line" | sed -n 's/.*load average[s]*: *\([^,]*\).*/\1/p')"
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fi
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status="OK"
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exit_code=0
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if ((load_per_cpu_pct >= critical_threshold)); then
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status="CRITICAL"
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exit_code=3
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elif ((load_per_cpu_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: 1-minute load is %s across %s CPU(s) (%s%% of CPU count)\n\n' "$status" "$load_1m" "$cpu_count" "$load_per_cpu_pct"
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printf 'Load average:\n'
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printf '1m=%s 5m=%s 15m=%s\n\n' "$load_1m" "$load_5m" "$load_15m"
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printf 'CPU count:\n'
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printf '%s\n\n' "$cpu_count"
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printf 'Top CPU processes:\n'
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ps -eo pid,ppid,user,pcpu,pmem,comm,args --sort=-pcpu | head -n "$((top_count + 1))"
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printf '\n'
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printf 'Evidence:\n'
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if command -v uptime >/dev/null 2>&1; then
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uptime || true
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else
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printf 'WARNING: uptime command not available; used /proc/loadavg where possible\n'
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fi
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if ((load_per_cpu_pct >= 100)); then
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printf 'WARNING: load is higher than online CPU count; runnable task saturation is possible\n'
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else
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printf 'OK: load is not above online CPU count at collection time\n'
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fi
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if [[ "${EUID:-$(id -u 2>/dev/null || printf '1')}" != "0" ]]; then
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printf 'WARNING: running without root; process ownership details are usually available, but some command lines may be limited\n'
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fi
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printf '\n'
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printf 'Recommended next steps:\n'
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printf -- '- Check process ownership and whether the top process is expected\n'
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printf -- '- Check recent deployments, cron jobs, batch jobs, or maintenance activity\n'
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printf -- '- Review logs for the top CPU-consuming process\n'
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printf -- '- Compare with longer trend data from monitoring before taking action\n'
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printf -- '- Attach this output to the incident ticket\n'
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exit "$exit_code"
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