Categoria: Scripts

bookmark_borderRHEL 7 : Script random root

Posted on by fabio.reis

Este este script foi escrito para que eu possa criar um root aleatório .

echo "Changing root password..."
      openssl rand 16 -base64 | passwd --stdin root &>/dev/null
      echo "Adjusting boot menu timeout..."
      sed -i 's/set timeout[[:space:]]*=.*$/set timeout=5/' /boot/grub2/grub.cfg &> /dev/null
      sed -i '/linux16/s/$/ console=tty1/' /boot/grub2/grub.cfg &> /dev/null
      echo "Rebooting your system in 5 seconds..."
      print_SUCCESS
      sleep 5
      systemctl reboot
      ;;

 

bookmark_borderScript de tunning do Apache

Posted on by fabio.reis

Script para verificar a performance do Apache .

 

#!/bin/bash
echo "Calculate MaxClients by dividing biggest Apache thread by free memory"
if [ -e /etc/debian_version ]; then
 APACHE="apache2"
elif [ -e /etc/redhat-release ]; then
 APACHE="httpd"
fi
APACHEMEM=$(ps -aylC $APACHE |grep "$APACHE" |awk '{print $8'} |sort -n |tail -n 1)
APACHEMEM=$(expr $APACHEMEM / 1024)
SQLMEM=$(ps -aylC mysqld |grep "mysqld" |awk '{print $8'} |sort -n |tail -n 1)
SQLMEM=$(expr $SQLMEM / 1024)
echo "Stopping $APACHE to calculate the amount of free memory"
/etc/init.d/$APACHE stop &> /dev/null
TOTALFREEMEM=$(free -m |head -n 2 |tail -n 1 |awk '{free=($4); print free}')
TOTALMEM=$(free -m |head -n 2 |tail -n 1 |awk '{total=($2); print total}')
SWAP=$(free -m |head -n 4 |tail -n 1 |awk '{swap=($3); print swap}')
MAXCLIENTS=$(expr $TOTALFREEMEM / $APACHEMEM)
MINSPARESERVERS=$(expr $MAXCLIENTS / 4)
MAXSPARESERVERS=$(expr $MAXCLIENTS / 2)
echo "Starting $APACHE again"
/etc/init.d/$APACHE start &> /dev/null
echo "Total memory $TOTALMEM"
echo "Free memory $TOTALFREEMEM"
echo "Amount of virtual memory being used $SWAP"
echo "Largest Apache Thread size $APACHEMEM"
echo "Amount of memory taking up by MySQL $SQLMEM"
if [[ SWAP > TOTALMEM ]]; then
      ERR="Virtual memory is too high"
else
      ERR="Virtual memory is ok"
fi
echo "$ERR"
echo "Total Free Memory $TOTALFREEMEM"

bookmark_borderScript : Telnet Monitoring

Posted on by fabio.reis

 

Uma vez este utilizei este script para uma demanda específica , então estou deixando aqui meu script caso alguém precise.

 


host=localhost
DATE=`date +%Y-%m-%d`
TIME=`date +%H%M%S`
LOG_OK=/tmp/telnet_ok
LOG_FAIL=/tmp/telnet_falha

for port in 80 25 22 443 110
do
if telnet -c $host $port </dev/null 2>&1 | grep -q Escape; then
  echo "$DATE $TIME  $port: Connected" >> $LOG_OK
else
  echo "$DATE $TIME $port : no connection" >> $LOG_FAIL 
fi
done

 

Caso precise receber email sobre o status podemos usá-lo da seguinte forma :

Considerando que a variável $NUM no começo do script é o número de portas a serem monitoradas. 


host=localhost
DATE=`date +%Y-%m-%d`
TIME=`date +%H%M%S`
LOG_OK=/tmp/telnet_ok
LOG_FAIL=/tmp/telnet_falha
$NUM=5

for port in 80 25 22 443 110
do
if telnet -c $host $port </dev/null 2>&1 | grep -q Escape; then
  echo "$DATE $TIME  $port: Connected" >> $LOG_OK
else
  echo "$DATE $TIME $port : no connection" >> $LOG_FAIL
tail -$NUM | mail -s "Port Check $DATE" fabio.abreu@fajlinux.com.br
fi
done

 

Após ajustar coloque no seu crontab.

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