system_opt.sh

#!/bin/bash
#author: salman sk
log_file="log/system_optimization.log"
config_file="config.conf"

if [ "$EUID" -ne 0 ]; then
  echo "Please run as root"
  exit 1
fi

if [ ! -f "$config_file" ]; then
  echo "Config file not found. Exiting."
  exit 1
fi

source "$config_file"

echo "$(date) - Starting system optimization" >> "$log_file"

log_error() {
  echo "$(date) - Error: $1" >> "$log_file"
}

echo "$(date) - Clearing system logs" >> "$log_file"
log_paths=("/var/log/*.log" "/var/log/messages" "/var/log/secure" "/var/log/maillog" "/var/log/cron" "/var/log/spooler" "/var/log/boot.log" "/var/log/dmesg")
for log_path in "${log_paths[@]}"; do
  if ! echo "" > "$log_path"; then
    log_error "Failed to clear log file $log_path"
  fi
done

echo "$(date) - Removing temporary files" >> "$log_file"
if ! rm -rf /tmp/* /var/tmp/*; then
  log_error "Failed to remove temporary files"
fi

echo "$(date) - Clearing cache" >> "$log_file"
if ! sync; then
  log_error "Failed to sync"
fi
if ! echo 3 > /proc/sys/vm/drop_caches; then
  log_error "Failed to clear cache"
fi

echo "$(date) - Cleaning RAM" >> "$log_file"
if ! free && sync && echo 3 > /proc/sys/vm/drop_caches && swapoff -a && swapon -a && free; then
  log_error "Failed to clean RAM"
fi

echo "$(date) - Cleaning kernel logs" >> "$log_file"
if ! dmesg --clear; then
  log_error "Failed to clear kernel logs"
fi

echo "$(date) - Optimizing CPU and RAM usage" >> "$log_file"

high_cpu_processes=$(ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%cpu | head -n 10 | awk 'NR>1 {print $1}')
for pid in $high_cpu_processes; do
  if ! renice -n 10 -p "$pid"; then
    log_error "Failed to renice process $pid"
  else
    echo "$(date) - Reniced process $pid" >> "$log_file"
  fi
done

high_mem_processes=$(ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head -n 10 | awk 'NR>1 {print $1}')
for pid in $high_mem_processes; do
  if ! kill -9 "$pid"; then
    log_error "Failed to kill high memory process $pid"
  else
    echo "$(date) - Killed high memory process $pid" >> "$log_file"
  fi
done

echo "$(date) - Killing unused processes" >> "$log_file"
unused_processes=$(ps aux --sort=-%mem | awk '$3<1.0 {print $2}')
for pid in $unused_processes; do
  if ! kill -9 "$pid"; then
    log_error "Failed to kill unused process $pid"
  else
    echo "$(date) - Killed unused process $pid" >> "$log_file"
  fi
done

echo "$(date) - Cleaning yum cache" >> "$log_file"
if ! yum clean all; then
  log_error "Failed to clean yum cache"
fi

echo "$(date) - Removing old kernels" >> "$log_file"
if ! package-cleanup --oldkernels --count=2; then
  log_error "Failed to remove old kernels"
fi

echo "$(date) - Running system updates" >> "$log_file"
if ! yum update -y; then
  log_error "Failed to run system updates"
fi

echo "$(date) - Optimizing file system" >> "$log_file"
if ! fsck -AR -y; then
  log_error "Failed to optimize file system"
fi

echo "$(date) - System optimization completed" >> "$log_file"

echo "System optimization completed. See $log_file for details."