swap+kernel tuning

startkit.sh

#!/bin/bash

apt update && apt upgrade -y && apt install -y mc htop curl git

# swap
fallocate -l 4G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
echo '/swapfile none swap sw 0 0' | tee -a /etc/fstab
swapon --show

# kernel tuning
# sysctl
echo 'vm.swappiness=10' | tee -a /etc/sysctl.d/99-sysctl.conf
echo 'fs.file-max=500000' | tee -a /etc/sysctl.d/99-sysctl.conf
echo 'net.core.somaxconn = 65536' | tee -a /etc/sysctl.d/99-sysctl.conf
# security limits
echo '*         hard    nofile      32768' | tee -a /etc/security/limits.conf 
echo '*         soft    nofile      32768' | tee -a /etc/security/limits.conf
echo 'root      hard    nofile      65536' | tee -a /etc/security/limits.conf
echo 'root      soft    nofile      65536' | tee -a /etc/security/limits.conf
sysctl -p