https://cloud.tencent.com/developer/article/1165387
sudo swapon –show
free -h
sudo fallocate -l 1G /swapfile
ls -lh /swapfile
sudo chmod 600 /swapfile
ls -lh /swapfile
sudo swapon /swapfile
sudo swapon –show
cat /proc/sys/vm/swappiness
sudo sysctl vm.swappiness=10