fallocate -l 4G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
swapon --show
sysctl vm.swappiness=10
sysctl vm.vfs_cache_pressure=50
echo '/swapfile none swap sw 0 0' | tee -a /etc/fstab
echo 'vm.swappiness=10' | tee -a /etc/sysctl.conf
echo 'vm.vfs_cache_pressure=50' | tee -a /etc/sysctl.conf