Monitor and Restart a Web Service

#!/bin/bash

# Configuration variables
SERVICE_NAME="nginx" # Name of the service to monitor (e.g., 'apache2', 'httpd', 'mysql')
LOG_FILE="/var/log/${SERVICE_NAME}_monitor.log" # Log file for monitoring actions

# Ensure the log file exists and is writable
mkdir -p "$(dirname "$LOG_FILE")"
touch "$LOG_FILE"

# Check if the service is active using systemctl
# --quiet suppresses output, -eq 0 means active
if ! systemctl is-active --quiet "$SERVICE_NAME"; then
    echo "[$(date +'%Y-%m-%d %H:%M:%S')] $SERVICE_NAME is down. Attempting to restart..." | tee -a "$LOG_FILE"
    systemctl restart "$SERVICE_NAME" >> "$LOG_FILE" 2>&1
    
    # Check status again after restart attempt
    if systemctl is-active --quiet "$SERVICE_NAME"; then
        echo "[$(date +'%Y-%m-%d %H:%M:%S')] $SERVICE_NAME restarted successfully." | tee -a "$LOG_FILE"
    else
        echo "[$(date +'%Y-%m-%d %H:%M:%S')] Failed to restart $SERVICE_NAME. Manual intervention required." | tee -a "$LOG_FILE"
    fi
else
    echo "[$(date +'%Y-%m-%d %H:%M:%S')] $SERVICE_NAME is running." | tee -a "$LOG_FILE"
fi