full-stack-health.sh

#!/bin/bash
LOG_FILE="/var/log/full-stack-health.log"
DATE=$(date "+%Y-%m-%d %H:%M:%S")
REDIS_HOST="127.0.0.1"
REDIS_PORT="6379"
NODE_APP="my-app.js"
MEM_LIMIT=500

echo "=== Full Stack Health Report - $DATE ===" >> $LOG_FILE

CPU=$(top -bn1 | grep "Cpu(s)" | awk '{print $2 + $4}')
MEM=$(free | awk '/Mem/ {printf("%.0f"), $3/$2 * 100}')
DISK=$(df / | awk 'END{print $5+0}')

echo "CPU Usage: $CPU%" >> $LOG_FILE
echo "Memory Usage: $MEM%" >> $LOG_FILE
echo "Disk Usage: $DISK%" >> $LOG_FILE

if systemctl is-active --quiet postgresql; then
    echo "PostgreSQL: Running" >> $LOG_FILE
else
    echo "PostgreSQL: DOWN!" >> $LOG_FILE
fi

if systemctl is-active --quiet redis-server; then
    echo "Redis: Running" >> $LOG_FILE
    MEM_USAGE=$(redis-cli -h $REDIS_HOST -p $REDIS_PORT info memory | grep used_memory: | awk -F: '{print $2}')
    MEM_MB=$((MEM_USAGE/1024/1024))
    echo "Redis Memory Usage: ${MEM_MB}MB" >> $LOG_FILE
    if [ $MEM_MB -gt $MEM_LIMIT ]; then
        redis-cli -h $REDIS_HOST -p $REDIS_PORT FLUSHALL
        echo "Redis cache cleared!" >> $LOG_FILE
    fi
else
    echo "Redis: DOWN!" >> $LOG_FILE
fi

if pgrep -f $NODE_APP > /dev/null; then
    echo "Node.js app: Running" >> $LOG_FILE
else
    echo "Node.js app: DOWN!" >> $LOG_FILE
fi

echo "" >> $LOG_FILE


# Run every 30 mins
 # -> */30 * * * * /home/ubuntu/scripts/full-stack-health.sh