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| fallocate -l 2G /swapfile | |
| chmod 600 /swapfile | |
| mkswap /swapfile | |
| swapon /swapfile | |
| echo "/swapfile none swap sw 0 0" >> /etc/fstab |
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fallocate does not work on CentOS 7.4, because of root FS type is XFS!
there u need to do it the old way:
dd if=/dev/zero of=/swapfile bs=1K count=1M;