اسکریپت‌نویسی Bash برای SysAdmin: خودکارسازی و پایش

#!/bin/bash
set -euo pipefail

readonly LOG_FILE="/var/log/myscript.log"

cleanup() {
    rm -f /tmp/myscript_$$.*
}
trap cleanup EXIT

log() {
    echo "[$(date +'%Y-%m-%d %H:%M:%S')] $*" | tee -a "$LOG_FILE"
}

check_disk_usage() {
    local mount_point="$1"
    local threshold="${2:-85}"
    local usage=$(df "$mount_point" | awk 'NR==2 {print $5}' | tr -d '%')
    
    if [[ "$usage" -gt "$threshold" ]]; then
        log "WARNING: $mount_point is ${usage}% full"
        return 1
    fi
    return 0
}

if ! check_disk_usage /var 90; then
    echo "Disk alert" | mail -s "Disk Alert" admin@company.com
fi

#!/bin/bash
# بررسی بار CPU
cpu_load=$(uptime | awk -F'load average:' '{print $2}' | awk -F',' '{print $1}' | tr -d ' ')
if (( $(echo "$cpu_load > 4.0" | bc -l) )); then
    echo "High CPU: $cpu_load" | mail -s "CPU Alert" admin@company.com
fi

# بررسی دیسک
df -h | awk 'NR>1 {gsub(/%/,"",$5); if($5>85) print "ALERT: "$6" is "$5"% full"}'

# بررسی سرویس‌ها
for service in nginx mysql sshd; do
    systemctl is-active --quiet "$service" || echo "Service $service is DOWN!"
done

while IFS=',' read -r hostname ip role; do
    ping -c 1 -W 1 "$ip" > /dev/null 2>&1 && echo "$hostname: UP" || echo "$hostname: DOWN"
done < hosts.csv