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templates/monitor.sh
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244
templates/monitor.sh
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#!/bin/bash
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# Version: 1.3.1
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# Author: Tomi Eckert
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# =============================================================================
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# SAP HANA Monitoring Script
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#
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# Checks HANA processes, disk usage, log segments, and statement queue.
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# Sends ntfy.sh notifications if thresholds are exceeded.
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# =============================================================================
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# --- Lock File Implementation ---
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LOCK_FILE="/tmp/hana_monitor.lock"
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if [ -e "$LOCK_FILE" ]; then
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echo "▶️ Script is already running. Exiting."
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exit 1
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fi
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touch "$LOCK_FILE"
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# Ensure lock file is removed on script exit
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trap 'rm -f "$LOCK_FILE"' EXIT
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# --- Configuration and Setup ---
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd)"
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CONFIG_FILE="${SCRIPT_DIR}/monitor.conf"
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if [ ! -f "$CONFIG_FILE" ]; then
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echo "❌ Error: Configuration file not found at ${CONFIG_FILE}" >&2
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rm -f "$LOCK_FILE"
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exit 1
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fi
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source "$CONFIG_FILE"
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STATE_DIR="${SCRIPT_DIR}/monitor_state"
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mkdir -p "${STATE_DIR}"
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# Helper functions for state management
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get_state() {
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local key="$1"
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if [ -f "${STATE_DIR}/${key}.state" ]; then
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cat "${STATE_DIR}/${key}.state"
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else
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echo ""
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fi
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}
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set_state() {
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local key="$1"
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local value="$2"
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echo "$value" > "${STATE_DIR}/${key}.state"
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}
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HOSTNAME=$(hostname)
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SQL_QUERY="SELECT b.host, b.service_name, a.state, count(*) FROM PUBLIC.M_LOG_SEGMENTS a JOIN PUBLIC.M_SERVICES b ON (a.host = b.host AND a.port = b.port) GROUP BY b.host, b.service_name, a.state;"
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send_notification_if_changed() {
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local alert_key="$1"
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local title_prefix="$2" # e.g., "HANA Process"
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local current_message="$3"
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local is_alert_condition="$4" # "true" or "false"
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local current_value="$5" # The value to store as state (e.g., "85%", "GREEN", "ALERT")
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local previous_value=$(get_state "${alert_key}")
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if [ "$current_value" != "$previous_value" ]; then
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local full_title=""
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local full_message=""
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if [ "$is_alert_condition" == "true" ]; then
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full_title="${title_prefix} Alert"
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full_message="🚨 Critical: ${current_message}"
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else
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# Check if it was previously an alert (i.e., previous_value was not "OK")
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if [ -n "$previous_value" ] && [ "$previous_value" != "OK" ]; then
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full_title="${title_prefix} Resolved"
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full_message="✅ Resolved: ${current_message}"
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else
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# No alert, and no previous alert to resolve, so just update state silently
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set_state "${alert_key}" "$current_value"
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return
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fi
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fi
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local final_message="[${COMPANY_NAME} | ${HOSTNAME}] ${full_message}"
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curl -H "Authorization: Bearer ${NTFY_TOKEN}" -H "Title: ${full_title}" -d "${final_message}" "${NTFY_TOPIC_URL}" > /dev/null 2>&1
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set_state "${alert_key}" "$current_value"
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echo "🔔 Notification sent for ${alert_key}: ${full_message}"
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fi
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}
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# --- HANA Process Status ---
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echo "⚙️ Checking HANA process status..."
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if [ ! -x "$SAPCONTROL_PATH" ]; then
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echo "❌ Error: sapcontrol not found or not executable at ${SAPCONTROL_PATH}" >&2
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send_notification_if_changed "hana_sapcontrol_path" "HANA Monitor Error" "sapcontrol not found or not executable at ${SAPCONTROL_PATH}" "true" "SAPCONTROL_ERROR"
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exit 1
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fi
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non_green_processes=$("${SAPCONTROL_PATH}" -nr "${HANA_INSTANCE_NR}" -function GetProcessList | tail -n +6 | grep -v 'GREEN')
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if [ -n "$non_green_processes" ]; then
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echo "🚨 Alert: One or more HANA processes are not running!" >&2
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echo "$non_green_processes" >&2
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send_notification_if_changed "hana_processes" "HANA Process" "One or more HANA processes are not GREEN. Problem processes: ${non_green_processes}" "true" "PROCESS_ALERT:${non_green_processes}"
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exit 1 # Exit early as other checks might fail
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else
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send_notification_if_changed "hana_processes" "HANA Process" "All HANA processes are GREEN." "false" "OK"
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echo "✅ Success! All HANA processes are GREEN."
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fi
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# --- Disk Space Monitoring ---
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echo "ℹ️ Checking disk usage..."
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for dir in "${DIRECTORIES_TO_MONITOR[@]}"; do
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if [ ! -d "$dir" ]; then
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echo "⚠️ Warning: Directory '$dir' not found. Skipping." >&2
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send_notification_if_changed "disk_dir_not_found_${dir//\//_}" "HANA Disk Warning" "Directory '$dir' not found." "true" "DIR_NOT_FOUND"
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continue
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fi
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usage=$(df -h "$dir" | awk 'NR==2 {print $5}' | sed 's/%//')
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echo " - ${dir} is at ${usage}%"
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if (( $(echo "$usage > $DISK_USAGE_THRESHOLD" | bc -l) )); then
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echo "🚨 Alert: ${dir} usage is at ${usage}% which is above the ${DISK_USAGE_THRESHOLD}% threshold." >&2
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send_notification_if_changed "disk_usage_${dir//\//_}" "HANA Disk" "Disk usage for ${dir} is at ${usage}%." "true" "${usage}%"
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else
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send_notification_if_changed "disk_usage_${dir//\//_}" "HANA Disk" "Disk usage for ${dir} is at ${usage}% (below threshold)." "false" "OK"
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fi
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done
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# --- HANA Log Segment Monitoring ---
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echo "⚙️ Executing HANA SQL query..."
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if [ ! -x "$HDBSQL_PATH" ]; then
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echo "❌ Error: hdbsql not found or not executable at ${HDBSQL_PATH}" >&2
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send_notification_if_changed "hana_hdbsql_path" "HANA Monitor Error" "hdbsql not found or not executable at ${HDBSQL_PATH}" "true" "HDBSQL_ERROR"
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exit 1
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fi
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readarray -t sql_output < <("$HDBSQL_PATH" -U "$HANA_USER_KEY" -c ";" "$SQL_QUERY" 2>&1)
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if [ $? -ne 0 ]; then
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echo "❌ Failure! The hdbsql command failed. Please check logs." >&2
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error_message=$(printf '%s\n' "${sql_output[@]}")
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send_notification_if_changed "hana_hdbsql_command" "HANA Monitor Error" "The hdbsql command failed. Details: ${error_message}" "true" "HDBSQL_COMMAND_FAILED"
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exit 1
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fi
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total_segments=0
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truncated_segments=0
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free_segments=0
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for line in "${sql_output[@]}"; do
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if [[ -z "$line" || "$line" == *"STATE"* ]]; then continue; fi
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cleaned_line=$(echo "$line" | tr -d '"')
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state=$(echo "$cleaned_line" | awk -F',' '{print $3}')
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count=$(echo "$cleaned_line" | awk -F',' '{print $4}')
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total_segments=$((total_segments + count))
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if [[ "$state" == "Truncated" ]]; then
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truncated_segments=$((truncated_segments + count))
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elif [[ "$state" == "Free" ]]; then
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free_segments=$((free_segments + count))
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fi
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done
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echo "ℹ️ Total Segments: ${total_segments}"
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echo "ℹ️ Truncated Segments: ${truncated_segments}"
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echo "ℹ️ Free Segments: ${free_segments}"
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if [ $total_segments -eq 0 ]; then
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echo "⚠️ Warning: No log segments found. Skipping percentage checks." >&2
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send_notification_if_changed "hana_log_segments_total" "HANA Log Segment Warning" "No log segments found. Skipping percentage checks." "true" "NO_LOG_SEGMENTS"
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else
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send_notification_if_changed "hana_log_segments_total" "HANA Log Segment" "Log segments found." "false" "OK"
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truncated_percentage=$((truncated_segments * 100 / total_segments))
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if (( $(echo "$truncated_percentage > $TRUNCATED_PERCENTAGE_THRESHOLD" | bc -l) )); then
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echo "🚨 Alert: ${truncated_percentage}% of log segments are 'Truncated'." >&2
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send_notification_if_changed "hana_log_truncated" "HANA Log Segment" "${truncated_percentage}% of HANA log segments are in 'Truncated' state." "true" "${truncated_percentage}%"
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else
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send_notification_if_changed "hana_log_truncated" "HANA Log Segment" "${truncated_percentage}% of HANA log segments are in 'Truncated' state (below threshold)." "false" "OK"
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fi
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free_percentage=$((free_segments * 100 / total_segments))
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if (( $(echo "$free_percentage < $FREE_PERCENTAGE_THRESHOLD" | bc -l) )); then
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echo "🚨 Alert: Only ${free_percentage}% of log segments are 'Free'." >&2
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send_notification_if_changed "hana_log_free" "HANA Log Segment" "Only ${free_percentage}% of HANA log segments are in 'Free' state." "true" "${free_percentage}%"
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else
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send_notification_if_changed "hana_log_free" "HANA Log Segment" "Only ${free_percentage}% of HANA log segments are in 'Free' state (above threshold)." "false" "OK"
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fi
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fi
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# --- HANA Statement Queue Monitoring ---
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echo "⚙️ Checking HANA statement queue..."
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STATEMENT_QUEUE_SQL="SELECT COUNT(*) FROM M_SERVICE_THREADS WHERE THREAD_TYPE = 'SqlExecutor' AND THREAD_STATE = 'Queueing';"
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queue_count=$("$HDBSQL_PATH" -U "$HANA_USER_KEY" -j -a -x "$STATEMENT_QUEUE_SQL" 2>/dev/null | tr -d '"')
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if ! [[ "$queue_count" =~ ^[0-9]+$ ]]; then
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echo "⚠️ Warning: Could not retrieve HANA statement queue count. Skipping check." >&2
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send_notification_if_changed "hana_statement_queue_check_fail" "HANA Monitor Warning" "Could not retrieve statement queue count." "true" "QUEUE_CHECK_FAIL"
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else
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send_notification_if_changed "hana_statement_queue_check_fail" "HANA Monitor Warning" "Statement queue check is working." "false" "OK"
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echo "ℹ️ Current statement queue length: ${queue_count}"
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breach_count=$(get_state "statement_queue_breach_count")
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breach_count=${breach_count:-0}
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if (( queue_count > STATEMENT_QUEUE_THRESHOLD )); then
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breach_count=$((breach_count + 1))
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echo "📈 Statement queue is above threshold. Consecutive breach count: ${breach_count}/${STATEMENT_QUEUE_CONSECUTIVE_RUNS}."
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else
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breach_count=0
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fi
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set_state "statement_queue_breach_count" "$breach_count"
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if (( breach_count >= STATEMENT_QUEUE_CONSECUTIVE_RUNS )); then
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message="Statement queue has been over ${STATEMENT_QUEUE_THRESHOLD} for ${breach_count} checks. Current count: ${queue_count}."
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send_notification_if_changed "hana_statement_queue_status" "HANA Statement Queue" "${message}" "true" "ALERT:${queue_count}"
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else
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message="Statement queue is normal. Current count: ${queue_count}."
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send_notification_if_changed "hana_statement_queue_status" "HANA Statement Queue" "${message}" "false" "OK"
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fi
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fi
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# --- HANA Backup Status Monitoring ---
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echo "ℹ️ Checking last successful data backup status..."
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last_backup_date=$("$HDBSQL_PATH" -U "$HANA_USER_KEY" -j -a -x \
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"SELECT TOP 1 SYS_START_TIME FROM M_BACKUP_CATALOG WHERE ENTRY_TYPE_NAME = 'complete data backup' AND STATE_NAME = 'successful' ORDER BY SYS_START_TIME DESC" 2>/dev/null | tr -d "\"" | sed 's/\..*//')
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if [[ -z "$last_backup_date" ]]; then
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message="No successful complete data backup found for ${COMPANY_NAME} HANA."
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echo "🚨 Critical: ${message}"
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send_notification_if_changed "hana_backup_status" "HANA Backup" "${message}" "true" "NO_BACKUP"
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else
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last_backup_epoch=$(date -d "$last_backup_date" +%s)
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current_epoch=$(date +%s)
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threshold_seconds=$((BACKUP_THRESHOLD_HOURS * 3600))
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age_seconds=$((current_epoch - last_backup_epoch))
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age_hours=$((age_seconds / 3600))
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if (( age_seconds > threshold_seconds )); then
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message="Last successful HANA backup for ${COMPANY_NAME} is ${age_hours} hours old, which exceeds the threshold of ${BACKUP_THRESHOLD_HOURS} hours. Last backup was on: ${last_backup_date}."
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echo "🚨 Critical: ${message}"
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send_notification_if_changed "hana_backup_status" "HANA Backup" "${message}" "true" "${age_hours}h"
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else
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message="Last successful backup is ${age_hours} hours old (Threshold: ${BACKUP_THRESHOLD_HOURS} hours)."
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echo "✅ Success! ${message}"
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send_notification_if_changed "hana_backup_status" "HANA Backup" "${message}" "false" "OK"
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fi
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fi
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echo "✅ Success! HANA monitoring check complete."
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