Cloud service memory 부족시 swap 영역 추가

출처:

•  https://www.codementor.io/@mecp/increasing-memory-ram-on-digitalocean-droplets-9um2mphxv

sudo fallocate -l 4G /swapfile &&  sudo chmod 600 /swapfile && sudo mkswap /swapfile && swapon /swapfile && sudo echo "/swapfile   none    swap    sw    0   0" >> /etc/fstab && sudo sysctl vm.swappiness=10 && sudo sysctl vm.vfs_cache_pressure=50 && sudo echo "vm.swappiness=10" >> /etc/sysctl.conf && sudo echo "vm.vfs_cache_pressure = 50" >> /etc/sysctl.conf