#!/bin/bash

##################Gnu/Linux Kernel /tmp filesystem optimized####################

read -r -p "Are You Begin? [Y/n] " input

case $input in

[yY][eE][sS]|[yY])

echo "Yes"

FSTAB=/etc/fstab

SYSCTL=/etc/sysctl.conf

if [ -f ${SYSCTL} ]; then

sed -i '$a\tmpfs \/tmp tmpfs defaults 0 0' ${FSTAB}

else

echo "The '${FSTAB}' file is not find"

fi

main=`uname -r | awk -F . '{print $1}'`

  minor=`uname -r | awk -F . '{print $2}'`

  if [ "$main" -ge 4 ] && [ "$minor" -ge 9 ];then

echo "The Kernel bigger 4.9"

sed -i '$a\net.core.default_qdisc = fq' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_congestion_control = bbr' ${SYSCTL}

else

echo "The Kernel less 4.9"

fi

sed -i '$a\net.ipv4.tcp_fin_timeout = 30' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_syn_retries = 2' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_keepalive_time = 1200' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_orphan_retries = 3' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_syncookies = 1' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_tw_reuse = 1' ${SYSCTL}

sed -i '$a\net.ipv4.ip_local_port_range = 1024 65000' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_max_syn_backlog = 8192' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_max_tw_buckets = 5000' ${SYSCTL}

sed -i '$a\net.ipv4.tcp_keepalive_probes = 5' ${SYSCTL}

sed -i '$a\net.core.netdev_max_backlog = 3000' ${SYSCTL}

sed -i '$a\vm.dirty_background_ratio = 5' ${SYSCTL}

sed -i '$a\vm.dirty_ratio = 10' ${SYSCTL}

sed -i '$a\vm.swappiness = 0' ${SYSCTL}

sed -i '$a\vm.vfs_cache_pressure = 62' ${SYSCTL}

echo "The Optimized end..."

exit 0

;;

[nN][oO]|[nN])

echo "No"

;;

*)

echo "Invalid input..."

exit 1

;;

esac