System Healthcheck shell script for Linux servers

 Simple Script for System Healthcheck

#!/bin/bash

 

# Author: Rajesh Rane

# Description: Simple System Health Check Script

 

LOGFILE="/var/log/system-health-$(date +%F).log"

HOSTNAME=$(hostname)

DATE=$(date)

 

{

echo "============================================"

echo " System Health Report for $HOSTNAME"

echo " Generated on: $DATE"

echo "============================================"

 

# Disk Usage

echo -e "\nDisk Usage:"

printf "%-20s %-10s %-10s %-10s %-6s %-s\n" "Filesystem" "Size" "Used" "Avail" "Use%" "Mounted on"

df -h --output=source,size,used,avail,pcent,target | tail -n +2

 

# CPU Load

echo -e "\nCPU Load (1/5/15 min average):"

uptime | awk -F'load average:' '{ print "  " $2 }'

 

# Memory Usage

echo -e "\nMemory Usage:"

free -h | awk 'NR==1 || /Mem|Swap/ { printf "  %-10s %-10s %-10s %-10s %-10s %-10s\n", $1, $2, $3, $4, $5, $6 }'

 

# Failed Services

echo -e "\nFailed Systemd Services:"

FAILED=$(systemctl --failed --no-legend)

if [ -z "$FAILED" ]; then

    echo "  No failed services."

else

    echo "$FAILED" | while read -r line; do

        echo "  $line"

    done

fi

 

# Top 5 Memory-Consuming Processes

echo -e "\nTop 5 Memory Consuming Processes:"

ps -eo user,pid,%cpu,%mem,command --sort=-%mem | head -n 6 | \

awk '{ printf "  %-10s %-6s %-6s %-6s %-s\n", $1, $2, $3, $4, substr($0, index($0,$5), 60) }'

 

# Top 5 CPU-Consuming Processes

echo -e "\nTop 5 CPU Consuming Processes:"

ps -eo user,pid,%cpu,%mem,command --sort=-%cpu | head -n 6 | \

awk '{ printf "  %-10s %-6s %-6s %-6s %-s\n", $1, $2, $3, $4, substr($0, index($0,$5), 60) }'

 

# Uptime

echo -e "\nSystem Uptime:"

echo "  $(uptime -p)"

 

# Package Updates

echo -e "\nAvailable Package Updates:"

if command -v apt &> /dev/null; then

    UPDATES=$(apt list --upgradable 2>/dev/null | grep -v "Listing...")

    if [ -z "$UPDATES" ]; then

        echo "  System is up to date."

    else

        echo "$UPDATES" | awk '{ print "  " $0 }'

    fi

elif command -v dnf &> /dev/null; then

    dnf check-update || echo "  System is up to date."

elif command -v yum &> /dev/null; then

    yum check-update || echo "  System is up to date."

else

    echo "  Package manager not supported."

fi

 

echo -e "\nEnd of Report"

 

} > "$LOGFILE"

 

# Optional: Send report via mail (if mail is configured)

MAIL_TO="your@email.com"

if command -v mail > /dev/null 2>&1; then

    mail -s "Daily Health Report for $HOSTNAME" "$MAIL_TO" < "$LOGFILE"

fi

 


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