增加swap


dd if=/dev/zero of=/var/swapfile bs=1024 count=5000k
mkswap /var/swapfile
chown root:root /var/swapfile 
chmod 600 /var/swapfile

swapon /var/swapfile
swapon -s

echo "/var/swapfile swap swap defaults 0 0" >> /etc/fstab

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