Linux system tuning

system_tuning.sh

#!/bin/bash

# file descriptor
# Change 400000 to increase or decrease number of file descriptor

echo "* soft nofile 400000" >> /etc/security/limits.conf
echo "* hard nofile 400000" >> /etc/security/limits.conf

# Changing kernal parameters (modify value if required)

echo "net.core.somaxconn = 262144" >> /etc/sysctl.conf
echo "net.ipv4.tcp_max_syn_backlog = 16384" >> /etc/sysctl.conf
echo "net.core.netdev_max_backlog = 655360" >> /etc/sysctl.conf
echo "net.core.rmem_max = 16777216" >> /etc/sysctl.conf
echo "net.core.wmem_max = 16777216" >> /etc/sysctl.conf
echo "net.ipv4.tcp_tw_recycle = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_tw_reuse = 1" >> /etc/sysctl.conf
echo "net.ipv4.ip_local_port_range = 1024 65535" >> /etc/sysctl.conf

sysctl -p