I ordered a ECS from Aliyun, it come without a (virtual) swap drive. Here are the steps to create one:
sudo dd if=/dev/zero of=/swapfile bs=1G count=2
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
A 2G swap space is created and activated. To make it available at next reboot: sudo vi /etc/fstab
add this:
/swapfile none swap sw 0 0
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